Biology 101 Exam 3 Practice Test 2026 | Most Tested Practice Questions & Verified Answers

,Biology 101 Exam 3 Practice Test 2026 |Most Tested Questions |
Graded A+
1. What is the function of rRNA?

All of the above

to move amino acids to the site of protein synthesis

to form part of the structure of the ribosome and act as an enzyme
for peptide synthesis

to move genetic information out of the nucleus and into the cytoplasm

2. What is a role of gene regulation in single-cell organisms?

Bacterium can adjust its gene expression to changes in its
environment

Bacterium can produce enzymes only as they are needed

Prevents bacterium from wasting energy and resources

All of the above

3. What is the term used to describe the method of DNA replication where
each new DNA molecule consists of one old strand and one new strand?

Dispersive replication

Semiconservative replication

Linear replication

Conservative replication

4. If two species share homologous traits, what can be inferred about their
evolutionary history?

, They are the same species that have diverged.

They likely share a common ancestor.

They evolved independently in response to similar environmental
pressures.

They have no evolutionary relationship.

5. If a substitution mutation occurs in a gene coding for a crucial enzyme, what
potential outcome could this have on the organism?

It could lead to a malfunctioning enzyme, affecting metabolic
processes.

It would enhance the enzyme's activity, improving metabolism.

It would have no effect on the organism's phenotype.

It would cause the organism to develop a new trait unrelated to the
enzyme.

6. Describe the structural characteristic of DNA that relates to its diameter.

DNA's diameter changes during transcription.

DNA has a uniform diameter due to its double helix structure.

DNA has an un-uniform diameter because of its single-stranded
nature.

DNA's diameter varies based on the sequence of nucleotides.

7. Each amino acid is 'coded for' by several possible sequences of bases

2

3

4

, K 5

8. What is the primary reason traits vary among individuals in a population?
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K Environmental factors K




K Age differences
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K Dietary habits K




K Genetic variation K




9. A multicellular organism begins life as a single cell—a fertilized egg with a
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complete set of chromosomes. The picture in Figure 10-2 above shows how the
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cell divides to become two cells, then four cells, eight cells, and so on. Which
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of the following statements best describes what happens during this process?
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K Chromosomes are divided evenly during cell division so that each new
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K daughter cell has an equal share of the original set.
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K Chromosomes are stored in the original cell to direct the division of all
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K daughter cells, which do not have their own chromosomes.
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K Chromosomes are randomly distributed during cell division so thatK K K K K K K K




K some new cells have partial sets while others have complete sets.
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Chromosomes are duplicated before cell division so that each new
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daughter cell has a complete set.
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