AnswersBiology Sem 1 2025-2026Unit Test

Unit Test — Unit test Answers

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1
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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.
2
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Which process is similar to binary fission?

A
genetic variation
B
crossing over
C
meiosis
D
mitosis
3

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.
4

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
5

Which process connects glycolysis and the citric acid cycle?

A
lactic acid formation
B
acetyl CoA formation
C
electron transport
D
Krebs cycle
6

How has the study of mitosis affected scientists’ knowledge of cancer?

A
It led to a study of how to induce cancer cells to divide more rapidly.
B
It led to an understanding of how cancer cells divide so rapidly.
C
It led to the development of contact-inhibition regulators.
D
It led to the discovery of how to prevent cancer cells from dividing.
7

Which process produces clones?

A
asexual reproduction
B
sexual reproduction
C
chromosome duplication
D
gamete formation
8

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.
9

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
10

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
11

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.
12

Meiosis occurs in a series of different phases and creates genetically unique reproductive cells. Which process helps make meiotic cells genetically different and occurs during prophase I, but not during prophase II?

A
fertilization
B
independent assortment
C
crossing over
D
chromosome replication
13

To which substance does ferredoxin transfer an electron?

A
photosystem I
B
photosystem II
C
NADP+
D
NADPH
14

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
15

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.
16

What is the end result of meiosis?

A
four identical daughter cells
B
four different daughter cells
C
two identical daughter cells
D
two different daughter cells
17

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.
18

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
19

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
20

The diagram shows a phase of mitosis.Which does the letter A represent in the diagram?

Question illustration
A
centriole
B
chromosome
C
centromere
D
spindle

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