Question 1

Which of the following best describes the main focus of molecular genetics?

Accepted Answer

The study of genetic material at the molecular level, including DNA, RNA, and protein interactions.

Question 2

In a forward genetic screen using C. elegans, what is the primary goal?

Accepted Answer

To identify genes involved in a specific biological process by screening for mutant phenotypes.

Question 3

Which molecular genetic technique is most commonly used to determine the function of a specific gene by observing the phenotype after gene disruption?

Accepted Answer

Reverse genetics, such as gene knockout experiments.

Question 4

During the eukaryotic cell cycle, which phase is responsible for DNA replication?

Accepted Answer

S phase

Question 5

What is the primary difference between mitosis and meiosis in terms of genetic outcome?

Accepted Answer

Mitosis produces genetically identical cells, while meiosis produces genetically diverse gametes.

Question 6

Which protein domain in the Trio protein is responsible for activating Rho family GTPases involved in axon guidance?

Accepted Answer

RhoGEF1 domain

Question 7

Defects in the human Trio gene are associated with which of the following conditions?

Accepted Answer

Autism and intellectual disability

Question 8

If a mutation in unc-73/Trio affects the RhoGEF2 domain, what is the most likely physiological consequence in C. elegans?

Accepted Answer

Defects in neurotransmission modulation

Question 9

Which equation correctly represents the number of chromosomes after S phase in a diploid cell with $$n$$ chromosomes?

Accepted Answer

$$2n$$ chromosomes, each with two sister chromatids$

Question 10

During meiosis, which stage is responsible for the separation of homologous chromosomes?

Accepted Answer

Meiosis I

Question 11

Which of the following best explains why molecular genetic techniques are important for understanding evolution?

Accepted Answer

They allow us to study how DNA changes serve as the raw material for evolutionary processes.

Question 12

In a forward genetic screen, which step follows mutagenesis?

Accepted Answer

Screening for animals with a phenotype of interest

Question 13

Which of the following is a key feature of reverse genetics compared to forward genetics?

Accepted Answer

Reverse genetics starts with a known gene and examines the resulting phenotype.

Question 14

Which stage of mitosis is characterized by the alignment of chromosomes at the cell's equatorial plane?

Accepted Answer

Metaphase

Question 15

What is the role of centromeres during mitosis?

Accepted Answer

They are key to the separation of sister chromatids.

Question 16

Which process results in the formation of haploid gametes from diploid cells?

Accepted Answer

Meiosis

Question 17

If a C. elegans mutant shows uncoordinated movement due to a nervous system defect, which gene is most likely affected based on the provided research?

Accepted Answer

unc-73/Trio

Question 18

Which of the following best describes the function of Rho family GTPases in the nervous system?

Accepted Answer

They regulate axon guidance and neurotransmission modulation.

Question 19

During meiosis II, what is the main event that occurs?

Accepted Answer

Separation of sister chromatids

Question 20

Which equation represents the ploidy change during meiosis from a diploid cell ($$2n) to $$gametes?

Accepted Answer

$$2n \rightarrow n$$

Introduction to Molecular Genetics: Concepts, Methods, and Cell Division

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