An organism with chloroplasts in its cells is probably.
a. a heterotroph
b. an autotroph
c. an herbivore
d. a primary consumer - CORRECT ANSWER B:
... [Show More] Organisms that have chloroplasts in their cells
carry on photosynthesis and are therefore autotrophs. Autotrophs make their own food.
What property of water allows someone to fill a glass slightly above the rim without the water
flowing over?
a. specific gravity
b. capillarity
c. opacity
d. surface tension - CORRECT ANSWER D: Water molecules are polar. Due to the fact that O2
draws the electrons in the molecule toward itself.
The spaces between neurons are called?
a. synapses
b. dendrites
c. inter-neurons
d. cell gaps - CORRECT ANSWER A: An impulse travels down the axon of a neuron and
reaches the terminus. There, chemicals are released in response, which travel across the synapse
to the next neuron. Thus the impulse is transmitted to the next neuron.
Which Group of chemicals is not normally found in most living things?
a. carbohydrates
b. proteins
c. silicates
d. nucleic acids - CORRECT ANSWER C: Carbohydrates, proteins, and nucleic acids (RNA and
DNA) are all very important chemicals in living things.
The alimentary canal is associated with the?
a. spinal cord
b. digestive system
c. urinary tract
d. birth canal - CORRECT ANSWER B: The alimentary canal begins at the mouth and ends at
the anus.
The numerous villi in the small intestine serve to?
a. secrete enzymes for digestion
b. absorb water from dissolved foods
c. secrete hydrochloric acid to dissolve food
d. provide greater surface for absorption - CORRECT ANSWER D: The villi are tiny projections
in the small intestine that increase the total surface area of the intestine for absorption of digested
nutrients.
As light passes obliquely from air to water, it is bent. This bending is called?
a. diffraction
b. reflection
c. refraction
d. dispersion - CORRECT ANSWER C: Refraction is the bending of light as it passes obliquely
from one medium to another.
Which of the following organelles is not involved in protein synthesis?
a. ribsome
b. mitochondrion
c. rough endoplasmic reticulum
d. nucleus - CORRECT ANSWER D: The nucleus contains DNA. The ribosomes, located on the
rough endoplasmic reticulum, are the site for protein synthesis.
To be absorbed by cells, proteins must be changed to?
a. amino acids
b. sucrose
c. fatty acids
d. glycerol - CORRECT ANSWER A: Amino acids are the end products of protein digestion and
are small enough to be absorbed.
A neuron that transmits impulses from the receptors to the spinal cord is called?
a. motor neuron
b. an associative neuron
c. an interneuron
d. a sensory neuron - CORRECT ANSWER D: A sensory neuron conveys a message from a
sensory organ to the spinal cord, which transmits the message via a motor neuron to the effector
muscle.
Which group of organisms help prevent the accumulation of organic wastes in nature?
a. rabbits
b. mosses
c. bacteria
d. ferns - CORRECT ANSWER C: Bacteria comprise the decomposer portion of the food chain.
As the eardrum is made to vibrate more rapidly, the sound is perceived as?
a. louder in intensity
b. softer in intensity
c. higher in pitch
d. lower in pitch - CORRECT ANSWER C: High-pitch sounds are heard when the receptor cells
closer to the oval window are stimulated, and low-pitch sounds result from the stimulation of the
cells that are farther down the cochlea.
In a field of pure white asters, a grower noticed a single blue aster. How could the grower test
whether this change affected the gamete-producing cells of the plant?
a. self-pollinate the flower, and plant the resulting seeds
b. examine the blue petals under an electron microscope
c. preform a chemical analysis to find the nature of the blue pigment
d. preform vegetative propagation on a cutting of the plant - CORRECT ANSWER A:
Remember that during a phase change from liquid to gas the temperature remains constant at
100C.
A human egg will develop into a female if it is fertilized by sperm containing?
a. an X chromosome
b. a Y chromosome
c. an XY chromosome
d. an XXY chromosome - CORRECT ANSWER A: A female has two X chromosomes, and a
male has one X chromosome and one Y chromosome. For a human egg to develop into a female,
it must be fertilized by a sperm containing an X chromosome.
In a food chain involving grass, grasshoppers, birds and mammals, the orginal source of energy
is?
a. glucose
b. sunlight
c. chlorophyll
d. ATP - CORRECT ANSWER B: Sunlight is absorbed by the chlorophyll contained in plants.
The absorbed energy fuels photosynthesis which produces glucose. In this food chain, grass is
the producer.
Which of the following equations represents a neutralization reaction?
a. 2Na+MgCl2 > Mg+2NaCl
b. CaCO3+4C > 3CO+CaC2
c. 4NH3+5O2 > 6H2O+4NO
d. H2CO3+Ca(OH)2 > 2H2O+CaCO3 - CORRECT ANSWER D: Equation d is a reaction
between an acid (carbonic acid) and a base [(Ca(OH)2] to form water and a salt. It is the only
neutralization reaction among the choices.
A reading on the Celsius scale is 5. On the Fahrenheit scale, the reading would be closet to?
a. 225
b. 30
c. 40
d. 95 - CORRECT ANSWER C: the formula for converting temperature in Celsius to
temperature in Fahrenheit is: T Fahrenheit = 9/5 x T Celsius + 32, therefore 5 degrees Celsius
convert to 41 degrees Fahrenheit. 9/5 x 5 = 9
9 + 31 = 41F
Which of these formulas represents an alcohol?
a. C2H5OC2H5
b. C3H8
c. CH3COOH
d. C2H5OH - CORRECT ANSWER D: An alcohol is usually characterized structurally by the
presence of an OH group attached to a hydrocarbon.
If a car's rate of change of velocity is negative, the car is?
a. speeding up
b. maintaining a constant speed
c. slowing down
d. stopped - CORRECT ANSWER C: If a car's rate of change of velocity is negative, the car's
acceleration is negative. this means that the car is decelerating (slowing down).
Consider the unbalanced equation __N2+__H2 > __NH3. What is the coefficient of ammonia in
the balanced equation that has the smallest whole-number coefficient?
a. 1
b. 2
c. 3
d. 4 - CORRECT ANSWER B: When balancing an equation, the number of atoms of each
element must be the same on both sides of the equation: N2+3H2 > 2NH3
Which of these nitrogenous bases may be found in RNA, but not DNA?
a. uracil
b. adenine
c. thymine
d. guanine - CORRECT ANSWER A: Uracil is found in RNA but not DNA. Thymine is found
in DNA but not in RNA. Guanine, cytosine and adenine are found in both.
A substance with a ph of 8 is a?
a. strong acid
b. weak acid
c. strong base
d. weak base - CORRECT ANSWER D: A substance with a ph between 8 and 14 is basic. The
closer the substance gets to a ph of 14, the more basic it is.
Binary fission in paramecia and budding in yeast cells are examples of?
a. asexual reproduction only
b. sexual reproduction only
c. spontaneous generation and sexual reproduction
d. both sexual and asexual reproduction - CORRECT ANSWER A: Binary fission and budding
are both examples of asexual reproduction, because cell division in both cases depends on
mitosis.
Which of these substances forms an alkaline solution in water?
a. Mg(OH)2
b. H2SO4
c. MgSO4
d. NaCl - CORRECT ANSWER A: Magnesium hydroxide is the only base of the four choices.
Thus in water, magnesium hydroxide releases hydroxide ions, forming a basic or alkaline
solution.
Certain seaweeds accumulate iodine in a concentration as much as a million times greater than
that of the surrounding ocean. How must this intake be accomplished?
a. osmosis
b. diffusion
c. active transport
d. passive transport - CORRECT ANSWER C: Since the concentrations are so much greater in
seaweed than in the surrounding water, iodine must have to move against a concentration
gradient. [Show Less]