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 statement about reverse genetics is correct?

Accepted Answer

Reverse genetics involves altering a specific gene and examining the resulting phenotype.

Question 4

The unc-73/Trio gene in C. elegans is required for which aspect of nervous system function?

Accepted Answer

Motility, by affecting nervous system circuitry and neurotransmission.

Question 5

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

Accepted Answer

Autism and intellectual disability.

Question 6

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

Accepted Answer

S phase

Question 7

What is the role of centromeres during mitosis?

Accepted Answer

Centromeres are key to the separation of sister chromatids during mitosis.

Question 8

Which protein domain in Trio is responsible for activating Rho family GTPases?

Accepted Answer

RhoGEF domains

Question 9

In meiosis, the first stage separates ______, while the second stage separates ______.

Accepted Answer

Homologous chromosomes; sister chromatids

Question 10

Which equation correctly represents the number of chromosomes after meiosis in a diploid organism?

Accepted Answer

$$n = \frac{N}{2}$$

Question 11

A mutation in the RhoGEF1 domain of Trio in C. elegans leads to which phenotype?

Accepted Answer

Defective nervous system circuitry affecting development

Question 12

Which process is essential for genetic diversity during sexual reproduction?

Accepted Answer

Meiosis

Question 13

Which of the following is a real-world application of molecular genetics techniques?

Accepted Answer

Identifying genes associated with neurological disorders in humans

Question 14

What is the primary difference between forward and reverse genetic screening?

Accepted Answer

Forward genetics starts with a phenotype and seeks the gene; reverse genetics starts with a gene and examines the phenotype.

Question 15

Which stage of mitosis involves the alignment of chromosomes at the cell's equator?

Accepted Answer

Metaphase

Question 16

During meiosis, crossing over occurs in which phase?

Accepted Answer

Prophase I

Question 17

Which of the following best explains why DNA changes are considered the raw material for evolution?

Accepted Answer

Mutations in DNA introduce genetic variation, which can be acted upon by natural selection.

Question 18

If a student wants to use a tablet for online exams in this course, which device is required?

Accepted Answer

An iPad

Question 19

Which molecular genetics technique would be most appropriate for determining the function of a newly discovered gene?

Accepted Answer

Reverse genetics using gene knockout

Question 20

Which equation represents the relationship between the number of sister chromatids and chromosomes after S phase?

Accepted Answer

$$	ext{Number of sister chromatids} = 2 	imes 	ext{Number of chromosomes}$$

Introduction to Molecular Genetics: Study Guide

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