Quiz Submissions - Quiz 3
Attempt 1
Written: Dec 27, 2020 8:45 PM - Dec 27, 2020 9:24 PM
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Question 1
In an electron microscope, what type of cells are used?
Question options:
live and fresh cells
live, processed cells
dead, but fresh cells
dead, processed cells
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Question 2
If a solution outside of a cell has a lower concentration of solutes inside of a cell, it is referred to as what?
Question options:
facilitated
isotonic
hypertonic
hypotonic
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Osmolarity describes the total amount of solutes dissolved in a specific amount of solution, and can either have more, less or the same amount of solutes. Review passive transport in Chapter 3.
Question 3
Cells that communicate with each other by direct contact use what?
Question options:
central vacuole
endoplasmic reticulum
intercellular junctions
plasma membrane
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Question 4
Light and dissecting microscopes are binocular. What does this mean?
Question options:
They have one eye piece, and one lens system
They have one lens system, that is split for each eye
They have two separate lens systems, one for each eye
They have two eye pieces, and one lens system
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Question 5
If a substance must move up a concentration gradient, there is an input requirement of what from the cell?
Question options:
ATP
H2O
Sugar
NaCl
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Question 6
Which structure carries out oxidation reactions that break down fatty acids and amino acids?
Question options:
mitochondria
peroxisomes
ribosomes
chloroplasts
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Question 7
Why can't cells store extra free energy?
Question options:
they can store free energy, which is why we are able to survive
it would result in a lowering of heat, which would freeze the cells
it would result in an increase of heat, which would denature enzymes
it would result in a lack of space, which would keep out other molecules
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Question 8
Reactions that absorb free energy are called what?
Question options:
endergonic
exergonic
potential
kinetic
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Question 9
What kind of metabolic pathway takes small molecules and builds them into larger ones, requiring energy?
Question options:
metabolism
bioenergetics
catabolic
anabolic
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Question 10
If a molecule binds to an active site in an enzyme, but it is not involved in the reaction and is simply slowing it down, what is it called?
Question options:
competitive inhibition
active site
substrate
enzyme
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Inhibition occurs when a molecule binds to the active site in the enzyme. Review energy and metabolism in Chapter 4.
Question 11
What is the term for when an activator binds to an enzyme, which alters the active site so that the substrate is able to bind?
Question options:
competitive inhibition
allosteric activation
active site
allosteric inhibition
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Activation occurs when an enzyme is turned on, and can occur using an alternate site. Review energy and metabolism in Chapter 4.
Question 12
What kind of energy does a slow moving wrecking ball contain?
Question options:
chemical energy
kinetic energy
heat energy
light energy
potential energy
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Question 13
During the light-dependent reactions of photosynthesis, what are the two energy-carrier molecules that absorb the energy from sunlight?
Question options:
ADP and ATP
ATP and NADPH
ADP and NADPH
NADPH and water
ATP and water
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Question 14
During the light-dependent reactions of photosynthesis, where does the oxygen come from?
Question options:
the hydrolysis of water
the hydrolysis of glucose
the loss of sugar
the loss of pigment
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Question 15
What is the cause of the electrochemical gradient in the thylakoid space?
Question options:
a buildup of hydrogen ions causing a difference in charge across the thylakoid membrane
a buildup of glucose causing a difference in the charge across the thylakoid membrane
a loss of oxygen through the stomata causing a shortage in the mesophyll cells
a loss of carbon dioxide through the stomata causing a shortage in the mesophyll cells
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Question 16
In which plant organ does photosynthesis most commonly occur?
Question options:
the root
the stem
the leaf
the flower
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Question 17
After a photon strikes photosystem II, photosynthesis is initiated. The energy then travels through the electron transport chain, and pumps what into the thylakoid space?
Question options:
carbon
oxygen
hydrogen
nitrogen
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Question 18
What is the name of the pigment in plants that absorbs wavelengths from the red and blue portions of the visible spectrum?
Question options:
chlorophyll a
chlorophyll b
carotenoids
glucose
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Question 19
Why is the mitochondria so important to a eukaryotic cell?
Question options:
they create energy from basic sugar molecules
it is the site of RNA synthesis and DNA storage
they are only found in eukaryotes
they play a role in protein synthesis
they are involved in transport of molecules
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Question 20
What is pili in prokaryotes?
Question options:
circular pieces of DNA that contain genes but not involved in cell reproduction
hair-like structures found on the surface of some prokaryotes
area of cytoplasm that contain the DNA molecule
made of two lipid layers which make the inside hydrophilic and the outside hydrophobic
a long whip-like structure that propels the cell into motion
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Question 21
What is the jelly-like matrix in both prokaryotes and eukaryotes that provides form to the cell and holds many of the organelles?
Question options:
cytoplasm
ribosomes
DNA
plasma membrane
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Question 22
What is a good generic definition of a hypothesis?
Question options:
A theory that can easily be proven by conducting a few simple experiments.
A combination of politics and scientific research to answer important questions for the general population.
An educated guess or expected answer to a scientific question based on prior knowledge and observation.
A prediction concerning a natural phenomenon based on personal observations in the natural world.
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Correct! Remember, a hypothesis should be based on observation, but should also be objective.
Question 23
Charles Darwin's concept of natural selection is said to be what?
Question options:
Scientific Law
Alternative Hypothesis
Scientific Theory
Null Hypothesis
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Correct! Natural selection is a theory, as it explains the why and how behind evolution.
Question 24
What is said of the hypothesis if the data gathered in an experiment is what is anticipated?
Question options:
rejected
disproven
supported
proven
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Correct! The scientific method cannot prove or disprove a hypothesis directly.
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