Question 1

Which of the following statements best describes the process of binary fission in bacteria?

Accepted Answer

A prokaryotic cell contains a single circular chromosome, which is replicated and then the cell divides, with each new cell receiving an identical copy of the original chromosome.

Question 2

Which protein is primarily responsible for condensing DNA into chromosomes in eukaryotes?

Accepted Answer

Histone

Question 3

During DNA replication, which enzyme is responsible for synthesizing the RNA primer required to initiate DNA synthesis?

Accepted Answer

Primase

Question 4

Which of the following best describes the function of telomerase in eukaryotic cells?

Accepted Answer

It extends the DNA at the tips of chromosomes to prevent shortening during replication.

Question 5

Which of the following is an example of a transition mutation?

Accepted Answer

Cytosine replaced by thymine

Question 6

A mutation that results in a premature stop codon is best described as a:

Accepted Answer

Nonsense mutation

Question 7

Which of the following is a real-world example of a model organism and its advantage?

Accepted Answer

Drosophila melanogaster, which has a short generation time and produces many offspring, making it ideal for genetic studies.

Question 8

Which of the following best describes a loss-of-function mutation?

Accepted Answer

A mutation that causes a complete or partial loss of the normal function of a gene product.

Question 9

Which of the following DNA repair mechanisms is responsible for correcting errors that escape proofreading during DNA replication?

Accepted Answer

Mismatch repair

Question 10

A zygote is formed when:

Accepted Answer

A sperm and an egg cell fuse at fertilization.

Question 11

Which of the following best describes a frameshift mutation?

Accepted Answer

A mutation that results from the insertion or deletion of nucleotides not in multiples of three, altering the reading frame.

Question 12

Which of the following is a characteristic of heteroplasmy?

Accepted Answer

The presence of two or more different populations of mitochondrial DNA within the same cell or individual.

Question 13

Which of the following is a real-world consequence of UV-induced DNA damage?

Accepted Answer

Formation of thymine dimers, which can distort the DNA helix and block replication.

Question 14

Which of the following best describes a single nucleotide polymorphism (SNP)?

Accepted Answer

A variation at a single base pair in DNA among individuals.

Question 15

Which of the following is a correct sequence of phases in mitosis?

Accepted Answer

Prophase, Metaphase, Anaphase, Telophase

Question 16

Which of the following is a likely result of a nonsense mutation in a gene?

Accepted Answer

A protein with a premature stop codon, resulting in a truncated protein.

Question 17

Which of the following is an example of a transition mutation?

Accepted Answer

$$	ext{Cytosine} ightarrow 	ext{Thymine}$$

Question 18

Which of the following best describes the function of the protein cohesin?

Accepted Answer

It holds together the two sister chromatids of a chromosome.

Question 19

Which of the following is a real-world application of studying model organisms like Caenorhabditis elegans?

Accepted Answer

Understanding the complete cell lineage during development.

Question 20

Which of the following is a correct description of a missense mutation?

Accepted Answer

A mutation that changes a single amino acid in the protein sequence.

Comprehensive Study Notes on Chromosomes, Mutations, and Model Organisms in Genetics

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