Question text
In an ecosystem, energy
Select one:
a. comes ultimately from bacteria
b. cycles along with chemical nutrients
c. typically flows from
... [Show More] producers through a series of consumers
d. typically flows from consumers to producers to decomposers
Question 2
Correct
1.00 points out of 1.00
Flag question
Question text
Life is organized in a hierarchical fashion. Which of the following sequences correctly
lists that hierarchy from least inclusive to most inclusive?
Select one:
a. organism, organ system, tissue, population, organ, organelle, community, cell,
ecosystem, molecule
b. ecosystem, population, organ system, cell, community, molecule, organ, organism,
organelle, tissue
c. molecule, organelle, cell, tissue, organ, organ system, organism, population,
community, ecosystem
d. cell, molecule, organ system, organ, organelle, population, tissue, organism,
ecosystem, community
Question 3
Correct1.00 points out of 1.00
Flag question
Question text
Organisms that are prokaryotes are in the domains
Select one:
a. plantae and Animalia
b. bacteria and Archaea
c. fungi and Bacteria
d. eukarya and Archaea
Question 4
Correct
1.00 points out of 1.00
Flag question
Question text
A theory is
Select one:
a. an idea that has been proven
b. an explanation of an idea that is broad in scope and supported by a large body of
evidence
c. a description of a belief that invokes the supernatural
d. a concept in the early stages that still needs to be tested
Question 5
Correct
1.00 points out of 1.00Flag question
Question text
To be scientifically valid, a hypothesis must be
Select one:
a. testable and falsifiable
b. controlled
c. reasonable
d. part of a theory
Question 6
Incorrect
0.00 points out of 1.00
Flag question
Question text
Members of the kingdom Animalia
Select one:
a. are composed of cells that lack a cell membrane
b. can obtain their food by eating other organisms
c. make their own food through photosynthesis
d. can obtain their food either by absorption or by photosynthesis
Question 7
Correct
1.00 points out of 1.00
Flag questionQuestion text
An antibiotic kills 99.9% of a bacterial population. You would expect the next generation
of bacteria
Select one:
a. to die out due to the drastic decrease in population size
b. to be more contagious than the prior generation
c. to be more resistant to that antibiotic
d. to be just as susceptible to that antibiotic as was the previous generation
Question 8
Correct
1.00 points out of 1.00
Flag question
Question text
A scientist performs a controlled experiment. This means that
Select one:
a. one experiment is performed, but the scientist controls the variables
b. the experiment is repeated many times to ensure that the results are accurate
c. two experiments are conducted, one differing from the other by only a single
variable
d. the experiment proceeds at a slow pace to guarantee that the scientist can carefully
observe all reactions and process all experimental data
Question 9
Correct
1.00 points out of 1.00
Flag question
Question textThe teeth of grain eating animals, such as horses, are usually broad and ridged. This
makes the teeth suitable for grinding and chewing. Meat eating animals, such as lions,
have pointed teeth that are good for puncturing and ripping flesh. This illustrates
Select one:
a. a result of natural selection as well as the connection between form and
function
b. the connection between form and function only
c. a food web
d. a result of natural selection only
Question 10
Correct
1.00 points out of 1.00
Flag question
Question text
The role of a control in an experiment is to
Select one:
a. provide a basis of comparison to the experimental group
b. ensure repeatability
c. counteract the negative effect of the experiment
d. prove that a hypothesis is correct
Question 11
Correct
1.00 points out of 1.00
Flag question
Question text
If you eat a hamburger, you are mainly eating ground up beef muscle. What levels of
organization are represented in this ground up muscle?
Select one:a. organism, population, and community
b. tissue, organ, and organ system
c. organelle, cell, and tissue
d. organ, organ system, and organism
Question 12
Correct
1.00 points out of 1.00
Flag question
Question text
Which of the following statements about genetics is true?
Select one:
a. dna is made up of six different kinds of nucleotides
b. differences among organisms reflect different nucleotide sequences in their DNA
c. genes are proteins that produce DNA
d. each DNA molecule is a single strand of nucleotides
Question 13
Correct
1.00 points out of 1.00
Flag question
Question text
The ultimate source of energy flowing into nearly all ecosystems is
Select one:
a. wind
b. radioactivity
c. electricityd. sunlight
Question 14
Correct
1.00 points out of 1.00
Flag question
Question text
All organisms belonging to the kingdom Plantae
Select one:
a. are multicellular and lack a nucleus
b. are unicellular and lack a nucleus
c. are photosynthetic
d. obtain food by decomposing the remains of dead organisms and absorbing the
nutrients
Question 15
Correct
1.00 points out of 1.00
Flag question
Question text
Kingdom Fungi includes species
Select one:
a. such as mushrooms and plants
b. that obtain food by ingestion
c. that use photosynthesis to obtain food
d. that obtain food by decomposing dead organisms and absorbing the nutrients
Question 16
Correct1.00 points out of 1.00
Flag question
Question text
The tree in your backyard is home to two cardinals, a colony of ants, a wasp's nest, two
squirrels, and millions of bacteria. Together, all of these organisms represent
Select one:
a. a species
b. a community
c. a population
d. an ecosystem
Question 17
Correct
1.00 points out of 1.00
Flag question
Question text
You notice that over the past month, many students on campus have started wearing a
new style of school sweatshirt. You think to yourself that perhaps the bookstore has
recently started selling this new sweatshirt style. This prediction is an example of
Select one:
a. an experiment
b. a type of observation
c. a hypothesis
d. an experimental question
Question 18
Correct
1.00 points out of 1.00Flag question
Question text
Which of the following statements about ecosystems is false?
Select one:
a. Chemical nutrients cycle within an ecosystem
b. Plants and other photosynthetic organisms are producers in ecosystems
c. In the process of energy conversions within an ecosystem, some energy is converted
to heat
d. bacteria and fungi recycle energy within an ecosystem
Question 19
Correct
1.00 points out of 1.00
Flag question
Question text
Which of the following statements about the properties of life is false?
Select one:
a. all organisms have the ability to reproduce
b. all organisms have the ability to respond to stimuli from the environment
c. all organisms have the ability to maintain a constant internal temperature
d. all organisms have the ability to take in energy and use it
Question 20
Correct
1.00 points out of 1.00
Flag questionQuestion text
A hypothesis is
Select one:
a. a proposed explanation for a set of observations
b. the same as a theory
c. a widely accepted idea about a phenomenon
d. an explanatory idea that is broad in scope and supported by a large body of evidence
Question 1
Correct
1.00 points out of 1.00
Flag question
Question text
Typically, nitrogen atoms are composed of electrons, protons, and neutrons. An isotope
of nitrogen could
Select one:
a. have more neutrons than the usual nitrogen atom
b. be positively charged
c. have more protons than the usual nitrogen atom
d. be negatively charged
Question 2
Correct
1.00 points out of 1.00
Flag question
Question textWhich of the following is a trace element in the human body?
Select one:
a. nitrogen
b. oxygen
c. zinc
d. hydrogen
Question 3
Incorrect
0.00 points out of 1.00
Flag question
Question text
Radioactive isotopes
Select one:
a. can be used in conjunction with PET scans to diagnose diseases
b. are never incorporated into organic compounds
c. are frequently added to foods as nutritional supplements
d. do not occur naturally
Question 4
Correct
1.00 points out of 1.00
Flag question
Question text
If you found a fossilized dinosaur bone, what method could be used to determine the
age of the fossil?
Select one:
a. electrophoresis
b. radial immunodiffusionc. isotope analysis
d. DNA fingerprinting
Question 5
Correct
1.00 points out of 1.00
Flag question
Question text
Waters surface tension and heat storage capacity is accounted for by its
Select one:
a. size
b. hydrogen bonds
c. mass
d. orbitals
Question 6
Correct
1.00 points out of 1.00
Flag question
Question text
Photosynthesis requires many steps to make glucose. As a result of the synthesis
process,
Select one:
a. all the carbons from the six carbon dioxide atoms are found in glucose
b. more carbon dioxide is released from the plant than is absorbed
c. more atoms are present at the beginning than at the end
d. water is synthesized by the plant from H2 and O2Question 7
Correct
1.00 points out of 1.00
Flag question
Question text
In the equation 2 H2 + O2 is equal to 2 H2O, the H2 molecules are ________ and the H2O
molecules are ________.
Select one:
a. reactants, products
b. products, reactants
c. created, destroyed
d. used, stored
Question 8
Correct
1.00 points out of 1.00
Flag question
Question text
Which of the following statements about radioactive isotopes is true?
Select one:
a. When given a choice between radioactive and nonradioactive isotopes of the same
atom, living cells are more likely to incorporate the radioactive isotopes into their
structures
b. the nuclei of radioactive isotopes are unusually stable, but the atoms tend to lose
electrons
c. radioactive elements are natural and therefore not harmful
d. the energy emitted by radioactive isotopes can break chemical bonds and cause
molecular damage in cells
Question 9
Correct1.00 points out of 1.00
Flag question
Question text
The body uses atoms in different ways to accomplish different tasks. For example, one
portion of the body's calcium supply strengthens bones, whereas another portion
combines with proteins to stimulate blood clotting after tissue injury. Which of the
statements that follow provides the most logical chemical explanation of calcium's
ability to perform such different functions?
Select one:
a. the calcium in blood is a more reactive form of the atom and therefore has fewer
protons than the calcium in bone
b. the bone contains calcium salts, which are less reactive than the calcium ions found
in the blood
c. there are many different isotopes of calcium, and the most reactive isotope is found
in the bone
d. the calcium in blood has a lighter atomic mass than the calcium in bone and is in a
more reactive form
Question 10
Correct
1.00 points out of 1.00
Flag question
Question text
A hydrogen atom has one electron. How many covalent bonds can hydrogen form?
Select one:
a. four covalent bonds
b. one covalent bond
c. no covalent bonds
d. two covalent bondsQuestion 11
Correct
1.00 points out of 1.00
Flag question
Question text
Compared to a solution of pH 3, a solution of pH 1 is
Select one:
a. 10 times more basic
b. 100 times more basic
c. 100 times more acidic
d. 10 times more acidic
Question 12
Correct
1.00 points out of 1.00
Flag question
Question text
What is the fundamental difference between covalent and ionic bonding?
Select one:
a. in covalent bonding, both partners end up with filled outer electron shells; in ionic
bonding, one partner does and the other does not
b. covalent bonds form between atoms of the same element; ionic bonds form between
atoms of different elements
c. covalent bonding involves only the outermost electron shell; ionic bonding also
involves the next electron shell inside the outermost shell
d. in a covalent bond, the partners share a pair of electrons; in an ionic bond, one
partner accepts electrons from the other
Question 13
Correct
1.00 points out of 1.00Flag question
Question text
A water molecule (H O H) is held together by
Select one:
a. two polar covalent bonds
b. a single covalent bond
c. hydrogen bonds
d. a double covalent bond
Question 14
Correct
1.00 points out of 1.00
Flag question
Question text
As ice melts,
Select one:
a. heat is released
b. hydrogen bonds are broken
c. the water becomes less dense
d. water molecules become less tightly packed
Question 15
Correct
1.00 points out of 1.00
Flag questionQuestion text
Table salt is formed when
Select one:
a. chlorine gives an electron to sodium
b. sodium donates its single outer electron to chlorine
c. a hydrogen bond forms between sodium and chlorine
d. sodium and chlorine share electrons to form a bond
Question 16
Incorrect
0.00 points out of 1.00
Flag question
Question text
Which of the following statements about water is false?
Select one:
a. ice is more dense than liquid water
b. Water naturally exists in all three physical states on Earth
c. floating ice on a pond insulates the liquid water below, slowing its rate of
freezing
d. if ice sank, the oceans would eventually freeze solid
Question 17
Incorrect
0.00 points out of 1.00
Flag question
Question text
What is the atomic mass of an atom that has 6 protons, 6 neutrons, and 6 electrons?
Select one:
a. 18b. 8
c. 12
d. 6
Question 18
Correct
1.00 points out of 1.00
Flag question
Question text
The emission of ________ and ________ are primarily responsible for acid precipitation.
Select one:
a. nitrogen oxides, sulfur oxides
b. halones, CFCs
c. carbon dioxide, ozone
d. carbon dioxide, methane
Question 19
Correct
1.00 points out of 1.00
Flag question
Question text
Which of the following is another term used for atomic mass?
Select one:
a. mendel
b. dalton
c. darwin
d. calvinQuestion 20
Correct
1.00 points out of 1.00
Flag question
Question text
Water molecules stick to other water molecules because
Select one:
a. water molecules are neutral, and neutral molecules are attracted to each other
b. covalent bonds form between the hydrogen atoms of one water molecule and the
oxygen atoms of other water molecules
c. hydrogen bonds form between the hydrogen atoms of one water molecule and the
oxygen atoms of other water molecules
d. the oxygen atoms of adjacent water molecules are attracted to one another
Which one of the following would be correctly classified as a protein?
Select one:
a. cholesterol
b. enzymes
c. starch
d. cellulose
Question 2
Correct
1.00 points out of 1.00
Flag question
Question textA protein containing more than one polypeptide chain exhibits the ________ level of
protein structure.
Select one:
a. tertiary
b. primary
c. quaternary
d. secondary
Question 3
Correct
1.00 points out of 1.00
Flag question
Question text
Proteins differ from one another because
Select one:
a. the peptide bonds linking amino acids differ from protein to protein
b. the sequence of amino acids in the polypeptide chain differs from protein to
protein
c. the number of nucleotides found in each protein varies from molecule to molecule
d. each protein contains its own unique sequence of sugar molecules
Question 4
Correct
1.00 points out of 1.00
Flag question
Question text
High fructose corn syrup is made from corn. The main carbohydrate in corn is a
polysaccharide called
Select one:a. hydrocarbon
b. fructose
c. starch
d. cellulose
Question 5
Correct
1.00 points out of 1.00
Flag question
Question text
Which of the following is an example of secondary structure in a protein?
Select one:
a. a globular shape
b. the joining of two polypeptide chains
c. an alpha helix
d. a particular amino acid sequence
Question 6
Correct
1.00 points out of 1.00
Flag question
Question text
An oil may be converted into a substance that is solid at room temperature by
Select one:
a. removing water, causing a dehydration synthesis reaction to occur
b. adding hydrogens, decreasing the number of double bonds in the molecules
c. removing hydrogens, increasing the number of double bondsd. cooling it, so that double bonds form and the fats solidify
Question 7
Correct
1.00 points out of 1.00
Flag question
Question text
If you were to add olive oil to your food as part of a diet to lower your risk of
atherosclerotic disease, you would use olive oil that
Select one:
a. is hydrogenated
b. has lard added to it
c. is modified to be solid at room temperature
d. is liquid at room temperature
Question 8
Correct
1.00 points out of 1.00
Flag question
Question text
DNA differs from RNA because DNA
Select one:
a. contains phosphate groups not found in RNA
b. contains the sugar ribose rather than the sugar deoxyribose
c. contains thymine in place of uracil
d. consists of a single rather than a double polynucleotide strand
Question 9
Correct
1.00 points out of 1.00Flag question
Question text
Which of the following substances is a lipid?
Select one:
a. steroids
b. DNA
c. enzymes
d. cellulose
Question 10
Correct
1.00 points out of 1.00
Flag question
Question text
The results of dehydration synthesis can be reversed by
Select one:
a. hydrolysis
b. polymerization
c. the addition of an amino group
d. condensation
Question 11
Correct
1.00 points out of 1.00
Flag questionQuestion text
A diet high in animal products and hydrogenated vegetable margarine may increase the
risk for atherosclerosis. This is because
Select one:
a. most animal fats are unsaturated and most hydrogenated vegetable margarines
contain high levels of steroids
b. most hydrogenated vegetable margarines are hydrogenated oils and most animal
products contain high levels of phospholipids
c. most animal fats are used for energy storage and most hydrogenated vegetable
margarines contain high levels of unsaturated fats
d. most animal fats are saturated and many hydrogenated vegetable margarines
contain high levels of trans fats
Question 12
Correct
1.00 points out of 1.00
Flag question
Question text
The molecular formula of most monosaccharides represents a multiple of
Select one:
a. cHO
b. cH3O
c. cHO2
d. cH2O
Question 13
Correct
1.00 points out of 1.00
Flag question
Question textWhat is the general function of enzymes within a cell?
Select one:
a. to stop chemical reactions
b. to speed up chemical reactions
c. to induce chemical reactions
d. to promote the synthesis of monomers
Question 14
Incorrect
0.00 points out of 1.00
Flag question
Question text
Which of the following statements regarding nucleotides is false?
Select one:
a. nucleotides contain nitrogenous bases
b. nucleotides contain lipids
c. nucleotides contain sugar molecules
d. nucleotides can be linked together to form nucleic acids
Question 15
Correct
1.00 points out of 1.00
Flag question
Question text
Which of the following functional groups is capable of regulating gene expression?
Select one:
a. oH
b. cOOHc. cO
d. cH3
Question 16
Correct
1.00 points out of 1.00
Flag question
Question text
Glucose molecules are to starch as ________ are to proteins.
Select one:
a. fatty acids
b. amino acids
c. monosaccharides
d. oils
Question 17
Correct
1.00 points out of 1.00
Flag question
Question text
Which of the following statements about dehydration synthesis is false?
Select one:
a. h2O is formed as the monomers are joined
b. covalent bonds are formed between the monomers
c. one monomer loses a hydrogen atom, and the other loses a hydroxyl group
d. animal digestive systems utilize this process to break down food
Question 18Correct
1.00 points out of 1.00
Flag question
Question text
Which of the following is a carboxyl group?
Select one:
a. nH2
b. oH
c. cO
d. cOOH
Question 19
Correct
1.00 points out of 1.00
Flag question
Question text
Cows can derive nutrients from cellulose because
Select one:
a. their intestinal tract contains cellulose-hydrolyzing microorganisms
b. they convert cellulose into starch, which is easily broken down in the intestinal tract
c. they chew their food so thoroughly that cellulose fibers are broken down
d. they produce the enzymes that break down cellulose
Question 20
Correct
1.00 points out of 1.00Flag question
Question text
The storage form of carbohydrates is ________ in animals and ________ in plants.
Select one:
a. glycogen, starch
b. cellulose, glycogen
c. starch, glycogen
d. glycogen, cellulose
As cell size increases, the
Select one:
a. volume and surface area decrease
b. surface area increases faster than the volume
c. surface area and volume increase at the same rate
d. volume increases faster than the surface area
Question 2
Correct
1.00 points out of 1.00
Flag question
Question text
Which of the following statements regarding plasmodesmata is false?
Select one:
a. plasmodesmata are found in plants as well as some single-celled organismsb. plasmodesmata penetrate plant cell walls
c. plasmodesmata carry nutrients between plant cells
d. plasmodesmata carry chemical messages between plant cells
Question 3
Correct
1.00 points out of 1.00
Flag question
Question text
Cyanide inhibits mitochondrial function; as a result, the rate of
Select one:
a. ATP synthesis decreases
b. ATP synthesis increases
c. photosynthesis increases
d. protein synthesis increases
Question 4
Correct
1.00 points out of 1.00
Flag question
Question text
Which of the following statements about cellular metabolism is false?
Select one:
a. Cellular metabolism often occurs on the surfaces of internal membranes
b. Cellular metabolism includes different processes that require different conditions
c. Cellular metabolism can occur within organelles
d. Cellular metabolism occurs in animal but not plant cells
Question 5Correct
1.00 points out of 1.00
Flag question
Question text
A manufacturing company dumps its wastes into a nearby pond. One of the wastes is
found to paralyze the contractile vacuoles of certain protists. A biologist looking at
individual samples of these organisms taken from the pond would find that they
Select one:
a. have lost water and shrunk
b. have died because wastes have built up in the cytoplasm
c. have gained water and burst
d. have died of malnutrition
Question 6
Correct
1.00 points out of 1.00
Flag question
Question text
The ________ cells lack a membrane enclosed nucleus.
Select one:
a. fungal
b. prokaryotic
c. plant
d. eukaryotic
Question 7
Correct
1.00 points out of 1.00Flag question
Question text
In the plasma membrane, the phospholipid heads
Select one:
a. are hydrophilic and face outward towards the aqueous solution on both sides of the
membrane
b. are hydrophobic and face inward, shielded from water
c. are hydrophobic and face outward towards the aqueous solution on both sides of the
membrane
d. are hydrophilic and face inward, shielded from water
Question 8
Correct
1.00 points out of 1.00
Flag question
Question text
Which of the following statements about cells is true?
Select one:
a. all cells have cell walls
b. all cells are attached to other cells
c. all cells are motile
d. all cells have internal structures that move
Question 9
Correct
1.00 points out of 1.00Flag question
Question text
Which of the following would be most affected by a mutation that prevented cells from
forming tight junctions?
Select one:
a. attachment of the cytoskeleton to the inside of the plasma membrane
b. integrity of the inner lining of the digestive tract
c. direct flow of water and small molecules from one cell to another
d. attachment of cells to the surrounding matrix
Question 10
Incorrect
0.00 points out of 1.00
Flag question
Question text
Intermediate filaments
Select one:
a. guide the movements of organelles
b. surround the nucleus
c. guide the movements of chromosomes
d. support the inner mitochondrial membrane
Question 11
Incorrect
0.00 points out of 1.00
Flag questionQuestion text
Which of the following cell structures is associated with the breakdown of harmful
substances or substances that are no longer needed by the cell?
Select one:
a. peroxisomes
b. chloroplasts
c. mitochondria
d. centrioles
Question 12
Correct
1.00 points out of 1.00
Flag question
Question text
It is essential for heart muscle cells to beat in a coordinated fashion. The cell junctions
that would best facilitate this are
Select one:
a. anchoring junctions
b. tight junctions
c. gap junctions
d. occluding junctions
Question 13
Incorrect
0.00 points out of 1.00
Flag question
Question text
Tay Sachs disease
Select one:a. causes an accumulation of lipids in brain cells
b. is due to the absence of an enzyme that digests polysaccharides
c. involves damage to liver cells
d. prevents the breakdown of glycogen
Question 14
Correct
1.00 points out of 1.00
Flag question
Question text
A scanning electron microscope is used to study ________, whereas a transmission
electron microscope is used to study ________.
Select one:
a. dead cells, live cells
b. live cells, dead cells
c. internal cell structures, cell surfaces
d. cell surfaces, internal cell structures
Question 15
Correct
1.00 points out of 1.00
Flag question
Question text
You are told that the cells on a microscope slide are plant, animal, or bacterial. You look
at them through a microscope and see cell walls and membrane bound organelles. You
conclude correctly that the cell
Select one:
a. are animal cellsb. are plant cells
c. could be either plant or bacterial cells
d. are bacterial cells
Question 16
Correct
1.00 points out of 1.00
Flag question
Question text
Which organelle is involved in the catabolism of fatty acids and the detoxification of
alcohol?
Select one:
a. smooth ER
b. peroxosome
c. golgi apparatus
d. ribosomes
Question 17
Correct
1.00 points out of 1.00
Flag question
Question text
Plasma membranes are permeable to
Select one:
a. small ions such as Na ion
b. hydrophilic molecules such as glucose
c. large hydrophilic molecules such as starchd. nonpolar molecules such as CO2
Question 18
Correct
1.00 points out of 1.00
Flag question
Question text
One centimeter equals ________ millimeters.
Select one:
a. 100
b. 10
c. 0.01
d. 0.10
Question 19
Correct
1.00 points out of 1.00
Flag question
Question text
Cilia differ from flagella in that
Select one:
a. cilia are anchored only in the proteins of the cell membrane, while flagella are
anchored in a special structure called the basal body
b. cilia contain nine microtubule doublets surrounding a central pair of microtubules,
while flagella contain only nine microtubule doublets
c. cilia are typically more numerous and shorter than flagella
d. the protein filaments of cilia are naked, while those of flagella are wrapped in an
extension of the cell membraneQuestion 20
Correct
1.00 points out of 1.00
Flag question
Question text
A scientist wants to magnify a pollen grain 8,000 times and examine the ridges and
pores on its surface. Which one of the following instruments would be best?
Select one:
a. a fluorescence confocal microscope
b. a scanning electron microscope
c. a transmission electron microscope
d. an inverted light microscope
Question 1
Not answered
Points out of 1.00
Flag question
Question text
A buffer
Select one:
a. donates H+ ions when conditions become too basic and accepts H+ ions when
conditions become too acidic
b. donates OH negative ions when conditions become too basic and accepts OH- ions
when conditions become too acidic
c. is an acid that is used to offset overly basic conditions in the body
d. is a base that is used to offset overly acidic conditions in the bodyQuestion 2
Correct
1.00 points out of 1.00
Flag question
Question text
It is essential for heart muscle cells to beat in a coordinated fashion. The cell junctions
that would best facilitate this are
Select one:
a. occluding junctions
b. gap junctions
c. anchoring junctions
d. tight junctions [Show Less]