AnswersGCS 2025-2026 Biology Credit RecoveryUnit 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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How does interphase prepare cells for mitosis?

A
rest prior to cell division
B
growth of cell and replication of DNA
C
dissolution of nucleus and cell membrane
D
division of cytoplasm
3

When skin cells are damaged by sunlight or injury, the cell cycle helps by promoting.

A
reproduction
B
repair
C
synthesis
D
growth
4

Each year, about 1.2 million cases of skin cancer are reported worldwide. An increased exposure to environmental conditions is a major link to the increase in cases. Based on this information, which is the best conclusion?

A
Limiting exposure to the sun may reduce the chance of skin cancer.
B
Limiting exposure to the sun may increase the chance of skin cancer.
C
Increasing exposure to the sun may reduce the chance of skin cancer.
D
Increasing exposure to the sun will not affect the chance of skin cancer.
5

Which process produces clones?

A
asexual reproduction
B
sexual reproduction
C
chromosome duplication
D
gamete formation
6

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.
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

Which best describes the processes of mitosis and meiosis?

A
Cells in mitosis go through the PMAT stages twice to produce diploid cells while cells in meiosis go through PMAT stages once to produce haploid cells.
B
Cells in mitosis and meiosis go through the PMAT stages twice to produce haploid cells.
C
Cells in mitosis go through the PMAT stages once to produce diploid cells while cells in meiosis go through PMAT stages twice to produce haploid cells.
D
Cells in mitosis and meiosis go through the PMAT stages once to produce diploid cells.
9

It is crucial that the process of mitosis is error free. This is because otherwise healthy cells can

A
grow into giant super cells.
B
undergo meiosis.
C
become cancer cells.
D
produce two identical cells.
10

The illustration below shows the steps of meiosis I. What is the step that is labeled D?

Question illustration
A
metaphase I
B
metaphase II
C
telophase II
D
telophase I
11

During photosynthesis, the energy from sunlight is used to split water molecules. What happens to the hydrogen ions that are split from the water molecules?

A
They flow out of the thylakoid, providing energy to add a phosphate group to ADP.
B
They build up in the thylakoid, providing energy to break apart ATP molecules.
C
They build up in the thylakoid, where they bond to each other to create ATP.
D
They flow out of the thylakoid, where they stimulate enzymes to break apart ATP.
12

During gym class, Raul walks briskly for a half hour. Jenna decides to sprint and run the bleachers for the same amount of time. Which statement best compares the cellular processes occurring in each student during this time?

A
Jenna’s cells are producing more lactic acid than Raul’s cells.
B
Raul’s cells are producing more lactic acid than Jenna’s cells.
C
Jenna’s cells are using more protein than Raul’s cells.
D
Raul’s cells are using more glycogen than Jenna’s cells.
13

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.
14

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.
15

Which statement explains how ATP and its phosphate groups are related to the energy that is used in plant processes?

A
ADP loses a phosphate group to create ATP, which stores energy for making sugars.
B
ADP gains a phosphate group to create ATP, which stores energy for making sugars.
C
ADP loses a phosphate group to create ATP; this process instantly releases energy for making sugars.
D
ADP gains a phosphate group to create ATP; this process results from sugar production.
16

The graph shows the number of calories that two people burn while they perform various exercises for one hour each.Which conclusion is supported by the graph?

Question illustration
A
The 200-pound person burns more calories per hour doing aerobics than doing any other exercise shown.
B
The 160-pound person burns about 50 calories per mile while jogging.
C
The 200-pound person would need to play volleyball for three hours to burn the same number of calories as he burns in one hour of basketball.
D
The 160-pound person burns about twice as many calories jogging as she does walking.
17

To which substance does ferredoxin transfer an electron?

A
photosystem I
B
photosystem II
C
NADP+
D
NADPH
18

Which correctly describes crossing over?

A
the process whereby non-sister chromatids exchange genetic material
B
the process whereby homologous chromosomes are pulled to opposite poles of the cell
C
the process whereby sister chromatids are pulled to opposite poles of the cell
D
the process whereby homologous chromosome pairs align randomly along the metaphase plate
19

During which step of cellular respiration is the most ATP produced?

A
Krebs cycle
B
glycolysis
C
photosynthesis
D
electron transport chain
20

Cells use different processes at different times to provide an organism with the energy that it needs. Spirulina is an autotrophic bacteria that can be found in freshwater and marine environments. Which process takes place in the cells of Spirulina that does not occur in the cells of a human?

A
photosynthesis
B
aerobic respiration
C
anaerobic respiration
D
cellular respiration

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