AnswersLHS Biology 1Unit Test

Unit Test — Unit test Answers

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At which point is G3P removed from the Calvin cycle to be used in the production of carbohydrates?

A
during photophosphorylation
B
during carbon fixation
C
immediately after reduction
D
immediately after regeneration
2
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Which process connects glycolysis and the citric acid cycle?

A
lactic acid formation
B
acetyl CoA formation
C
electron transport
D
Krebs cycle
3

Which specific process in the light-dependent reactions produces oxygen and hydrogen ions?

A
the formation of NADPH
B
the production of ATP
C
the splitting of water
D
the excitation of electrons in photosytem I
4

In what way are the light-dependent and light-independent reactions of photosynthesis similar?

A
Both require chemical energy to proceed.
B
Both occur in the chloroplast.
C
Both produce oxygen as a byproduct.
D
Both involve carbon fixation.
5

If a runner is doing vigorous exercise, which results from the anaerobic cellular process?

A
accumulation of lactic acid
B
accumulation of oxygen
C
depletion of ethanol
D
depletion of carbon dioxide
6

To which substance does ferredoxin transfer an electron?

A
photosystem I
B
photosystem II
C
NADP+
D
NADPH
7

Which statement best distinguishes an observation from an inference?

A
An inference is likely to change based on additional observations.
B
An observation is likely to change based on additional inferences.
C
An observation involves assumptions, but an inference does not.
D
An inference involves the senses, but an observation does not.
8

What role does cellular respiration play in the carbon cycle?

A
It removes CO2 from the atmosphere during glycolysis.
B
It removes CO2 from the atmosphere during the citric acid cycle.
C
It releases CO2 to the atmosphere during acetyl CoA formation.
D
It releases CO2 to the atmosphere during electron transport.
9

Stella wants to test the hypothesis “If carbon dioxide levels increase, the growth rate of sunflowers will increase.” She places five young sunflower plants into similar containers and sets up pumps that release different amounts of carbon dioxide into each container. She plans to measure the daily height of the plants for two weeks and graph the data. Which option would allow Stella to set up a control group for the experiment?

A
She should provide mist to each of the plants except one plant to keep the air moist and fertilize the plants.
B
She should give the plants receiving the least CO2 a little more oxygen to compensate for the difference in gases.
C
She should give all the flowers the same amount of water.
D
She should place one flower in a similar container, but not pump carbon dioxide into it.
10

After Frida stops exercising, she continues to breathe heavily. What is most likely occurring in her body?

A
Heavy breathing during exercise has produced an oxygen surplus in her muscles. This oxygen is being transported to her lungs. This is a result of aerobic respiration.
B
Heavy breathing during exercise has produced a carbon dioxide surplus in her muscles. Lactate is being transported to her liver. This is a result of aerobic respiration.
C
Strenuous exercise has caused her body to be in carbon dioxide debt, and she is breathing hard while lactate is transported to the liver. This is a result of anaerobic respiration.
D
Strenuous exercise has caused her body to be in oxygen debt, and she is breathing hard while lactate is transported to the liver. This is a result of anaerobic respiration.
11

Which speeds up the reaction between carbon dioxide and RuBP to restart the Calvin Cycle?

A
light energy
B
rubisco
C
3-phosphoglycerate
D
glyceraldehyde 3-phosphate
12

Which events take place in the light-dependent reactions of photosynthesis?

A
Light energy is converted to sugars; sugars are broken down for energy.
B
Light energy is captured by plants; light energy is used to make sugar.
C
Light energy is converted to chemical energy; chemical energy is used to make sugar.
D
Light energy is captured by plants; light energy is converted to chemical energy.
13

Which statement about the light-independent reactions in photosynthesis is true?

A
They occur in the thylakoids.
B
They produce ATP and NADPH.
C
They release oxygen as waste.
D
They comprise the Calvin cycle.
14

Which is a commercial use for lactic acid fermentation?

A
making starch
B
making bread
C
making wine
D
making cheese
15

How do ATP and NADPH connect light-dependent and light-independent reactions in photosynthesis?

A
ATP and NADPH are produced in both reactions.
B
ATP and NADPH are used in both reactions.
C
ATP and NADPH are produced in the light-dependent reactions and used in the light-independent reactions.
D
ATP and NADPH are produced in the light-independent reactions and used in the light-dependent reactions.
16

Which is the best description of photophosphorylation?

A
the absorption of light energy by chlorophyll
B
the conversion of light energy to chemical energy
C
the removal of a phosphate group from a molecule
D
the conversion of ADP to ATP using light energy
17

What do alcohol fermentation, acetyl CoA formation, and the Krebs cycle have in common?

A
All produce water.
B
All produce carbon dioxide.
C
All produce ATP.
D
All produce alcohol.
18

Along with plants and algae, in which organisms can photosynthesis occur?

A
some bacteria
B
all fungi
C
some animals
D
all protists
19

What is the source of the carbon dioxide that is used in photosynthesis?

A
sunlight
B
the soil
C
the atmosphere
D
the plant
20

What is one role of ATP in the light-independent reaction of photosynthesis?

A
ATP supplies the energy to produce glucose and other carbohydrates.
B
ATP is produced when water molecules are split and chlorophyll electrons are excited.
C
ATP supplies the energy to split water molecules.
D
ATP produces CO2 and O2 molecules.

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