Mr. Jones Practice Test

The process in which plants capture energy and make organic molecules is known as
a. homeostasis.
b. evolution.
c. photosynthesis.
d. development.

Cells produce ATP most efficiently in the presence of
a. water.
b. carbon dioxide. Incorrect
c. oxygen.
d. glucose.

Heterotrophs get energy

a. from organic molecules. Incorrect
b. through cellular respiration.
c. from breaking down food molecules.
d. All of the above

Low temperatures may cause photosynthesis to occur
Select one:
a. more quickly.
b. more slowly.
c. at a constant rate.
d. None of the above

Which of the following reactions provides the chemical energy for most cell functions?
Select one:
a. ATP – P mc055-1.jpg ADP
b. ATP + P mc055-2.jpg ADP
c. ADP – P mc055-3.jpg ATP
d. ADP + P mc055-4.jpg ATP

Most of the energy used by life on Earth comes from
Select one:
a. the sun.
b. the rotation of the Earth.
c. the moon.
d. None of the above

Energy released from ATP
Select one:
a. contains five phosphate groups.
b. drives most of a cell’s activities.
c. is found only in bacteria.
d. All of the above

Heterotrophs are organisms that
Select one:
a. produce food from inorganic molecules or sunlight.
b. can survive without energy.
c. must consume other organisms to get energy.
d. None of the above

As light intensity increases indefinitely, the rate of photosynthesis increases indefinitely.
Select one:

True
False

Chlorophyll is green because
Select one:
a. it absorbs green wavelengths of light.
b. it absorbs blue and yellow wavelengths, which make green.
c. it reflects green wavelengths of light.
d. of an optical illusion caused by transmitted light.

The water molecules l are going to the thylakoids to take part in which process?

Select one:
a. light-dependent reactions
b. Krebs cycle
c. Calvin cycle Incorrect
d. light-independent reactions

What happens to the sugars that are made during photosynthesis?
Select one:
a. They move directly into an electron transport chain.
b. They go back into the Calvin cycle. I
c. They can be used for cellular respiration.
d. They make ATP by bonding together.

Many autotrophs obtain the energy they need for metabolism through
Select one:
a. fermentation.
b. photosynthesis.
c. cellular respiration.
d. eating food.

When a phosphate group is removed from an ATP molecule,
Select one:
a. a substantial amount of energy is released.
b. an enzyme is formed.
c. energy is stored.
d. activation energy is increased.

Which of the following statements is true for all cells?
Select one:
a. They use solar energy.
b. They use photosynthesis.
c. They use chemical energy.
d. They use chemosynthesis.

During photosynthesis, carbon dioxide and water, in the presence of light, are used to form sugars and oxygen gas.
Select one:
True
False

Light energy is converted to chemical energy through the process of
Select one:
a. cellular respiration.
b. fermentation.
c. photosynthesis.
d. glycolysis.

Photosynthesis is a process that takes place in autotrophs.
Select one:
True
False

As light intensity increases, the rate of photosynthesis
Select one:
a. increases indefinitely.
b. decreases indefinitely.
c. increases until the light saturation point is reached.
d. decreases until the light saturation point is reached.

Heterotrophs obtain the chemical energy used in metabolism from autotrophs or from other heterotrophs.
Select one:
True
False

The major light-absorbing pigment in plant photosynthesis is chlorophyll.
Select one:
True
False

The dark reactions of photosynthesis
Select one:
a. require ATP and NADPH.
b. are light-independent.
c. generate sugars.
d. All of the above

Most of the three-carbon sugars formed during the Calvin Cycle are used to generate the initial five-carbon compounds.
Select one:
True
False

As carbon dioxide concentration increases indefinitely, the rate of photosynthesis increases indefinitely.
Select one:
True
False

Which of the following statements is true of ATP?
Select one:
a. It stores energy as glucose.
b. It transfers energy to cell processes.
c. It releases energy when it gains a phosphate group.
d. It converts sunlight into chemical energy.

nar001-1.jpg

Refer to the illustration above. Graph A demonstrates that the rate of photosynthesis
Select one:
a. decreases in response to increasing light intensity.
b. increases indefinitely in response to increasing light intensity.
c. increases in response to increasing light intensity, but only to a certain point.
d. is unaffected by changes in light intensity.

Energy flows from the sun through the living world when
Select one:
a. plants capture sunlight and produce carbohydrates.
b. animals eat plants.
c. animals eat other animals that have eaten plants.
d. All of the above

During photosynthesis, the series of reactions that create the complex carbohydrates needed for energy and growth is called
Select one:
a. the Calvin cycle.
b. the Krebs cycle.
c. the electron transport chain.
d. None of the above

Energy moves through food chains from heterotrophs to autotrophs.
Select one:
True
False

What is the term for an organism that makes its own source of chemical energy?
Select one:
a. decomposer
b. producer
c. chloroplast
d. protist

The major atmospheric by-product of photosynthesis is
Select one:
a. nitrogen.
b. carbon dioxide.
c. water.
d. oxygen.

The “light reactions” of photosynthesis can occur only under light conditions, and the “dark reactions” occur only during the dark hours.
Select one:
True
False

Which of the following is the best explanation for the presence of both chloroplasts and mitochondria in plant cells?
Select one:
a. In the light, plants are photosynthetic autotrophs. In the dark, they are heterotrophs.

b. If plants cannot produce enough ATP in the process of photosynthesis to meet their energy needs, they can produce it in aerobic respiration.

c. Sugars are produced in chloroplasts. These sugars can be stored in the plant for later use.

d. The leaves and sometimes the stems of plants contain chloroplasts, which produce ATP to meet the energy needs of these plant parts. The roots of plants contain mitochondria, which produce ATP to meet the energy needs of these plant parts.

All organisms require energy to carry out life processes.
Select one:
True
False

The light-independent reactions of photosynthesis need
Select one:
a. carbon dioxide.
b. oxygen.
c. water.
d. cellulose.

While the rate of photosynthesis is independent of temperature, it has been shown to be markedly affected by changes in light intensity.
Select one:
True
False

Which of the following is a reactant in photosynthesis?

When cells break down food molecules, energy is
Select one:
a. released all at once.
b. released entirely as body heat into the environment.
c. temporarily stored in ATP molecules.
d. None of the above

ATP is called a cell’s “energy currency” because
Select one:
a. ATP catalyzes all metabolic reactions.
b. ATP allows one organelle to be exchanged for another between cells.
c. glucose is made of ATP.
d. most of the energy that drives metabolism is supplied by ATP.

Energy is released from an ATP molecule for cellular processes when it
Select one:
a. has a phosphate group removed.
b. stores an extra phosphate group.
c. converts a phosphate group to ADP.
d. produces a sugar molecule.

The source of oxygen produced during photosynthesis is
Select one:
a. carbon dioxide.
b. water.
c. the air.
d. glucose.

Which of the following statements best describes the process of photosynthesis?
Select one:
a. Plants use oxygen to make simple sugars.
b. Chlorophyll builds sugars in the thylakoid membrane.
c. Light breaks down water molecules and releases carbon dioxide.
d. Chloroplasts absorb sunlight and store chemical energy.

Products of the light reactions of photosynthesis that are required by the dark reactions are
Select one:
a. oxygen and ATP.
b. water and oxygen.
c. ATP and NADPH.
d. oxygen and NADPH.

Which chemical equation best represents the process of photosynthesis?
Which chemical equation best represents the process of photosynthesis?

Because of photosynthesis,
Select one:
a. the atmosphere is rich in oxygen gas.
b. animals can get energy directly from the sun.
c. plants produce carbon dioxide.
d. All of the above

The main light-absorbing molecules found in plant leaves are called
Select one:
a. chloroplasts.
b. thylakoids
c. chlorophyll.
d. grana.

Select one:
a. photosynthesis is independent of environmental influences. Incorrect
b. increases in light intensity cause increases in temperature.
c. as the rate of photosynthesis increases, the temperature of a plant eventually decreases.
d. the rate of photosynthesis is affected by changes in the environment.

Where in plant cells are the energy-absorbing molecules for photosynthesis located?
Select one:
a. stroma
b. thylakoids
c. ATP synthase
d. mitochondria

Which phrase best describes the function of the ATP molecule?
Select one:
a. stores energy
b. carries energy
c. absorbs energy
d. converts energy

Heterotrophic organisms use light energy to make organic compounds.
Select one:
True
False

The total amount of ATP that a cell gains for each glucose molecule depends on the presence of
Select one:
a. water.
b. carbon dioxide.
c. oxygen.
d. glucose.

The function of the light-dependent reactions is to
Select one:
a. build sugars.
b. capture and transfer energy.
c. release carbon dioxide.
d. form water molecules.

ATP is a portable form of “energy currency” inside cells.
Select one:
True
False

Most plants are heterotrophic.
Select one:
True
False

When light hits a plant, all of the wavelengths of light are absorbed by chlorophyll.
Select one:
True
False