Question 1

Which of the following best describes the role of protein kinases in a phosphorylation cascade during cell signaling?

Accepted Answer

They add phosphate groups to proteins, often activating or changing their function.

Question 2

A hydrophobic signaling molecule, such as a steroid hormone, is most likely to bind to which type of receptor?

Accepted Answer

Intracellular receptor located in the cytoplasm or nucleus

Question 3

During which phase of mitosis do chromosomes align along the metaphase plate, preparing for separation?

Accepted Answer

Metaphase

Question 4

Which of the following events occurs during the S phase of interphase?

Accepted Answer

DNA is replicated, resulting in duplicated chromosomes.

Question 5

What is the result of mitosis in terms of cell number and ploidy?

Accepted Answer

Two diploid cells

Question 6

Which process during meiosis is primarily responsible for generating new combinations of alleles on the same chromosome?

Accepted Answer

Crossing over during prophase I

Question 7

A human gamete contains how many chromosomes, and what is its ploidy?

Accepted Answer

23 chromosomes, haploid ($$n)$$

Question 8

If nondisjunction occurs during meiosis II, what is the expected outcome for the resulting gametes?

Accepted Answer

Half of the gametes will be normal, and half will have either an extra or missing chromosome.

Question 9

A woman who is a carrier for an X-linked recessive disorder and a man who does not have the disorder have a son. What is the probability that their son will have the disorder?

Accepted Answer

$$0.5$$

Question 10

Which of the following best explains why X-linked recessive disorders are more common in males than females?

Accepted Answer

Males have only one X chromosome, so a single recessive allele will cause the disorder.

Question 11

What is the term for the event in which a fertilized egg ends up with too few or too many copies of a chromosome?

Accepted Answer

Aneuploidy

Question 12

Which of the following statements about G protein-coupled receptors (GPCRs) is correct?

Accepted Answer

GPCRs activate G proteins by facilitating the exchange of GDP for GTP.

Question 13

Which of the following best describes the difference between genotype and phenotype?

Accepted Answer

Genotype is the genetic makeup; phenotype is the observable traits.

Question 14

In Mendel’s dihybrid cross between yellow, round pea-producing plants and green, wrinkled pea-producing plants, what hypothesis was supported by the observed 9:3:3:1 ratio in the F2 generation?

Accepted Answer

The law of independent assortment

Question 15

Which of the following is true of X-linked genes but NOT true of Y-linked genes?

Accepted Answer

They can be inherited by both males and females.

Question 16

What is the main reason that different cell types can respond differently to the same signaling molecule?

Accepted Answer

Different cells have different receptors or signal transduction pathways.

Question 17

Which of the following best describes the relationship between cyclins, cyclin-dependent kinases (CDKs), and the cell cycle?

Accepted Answer

Cyclins bind to and activate CDKs, which then regulate progression through the cell cycle.

Question 18

Which of the following is an example of an epistatic interaction?

Accepted Answer

A gene that determines whether pigment is produced, masking the effect of another gene that determines pigment color.

Question 19

Which of the following best defines a genome?

Accepted Answer

All the genes and noncoding DNA present in an organism.

Question 20

A cell that gains the ability to divide uncontrollably is said to have become:

Accepted Answer

Cancerous

Cell Signaling, Cell Division, Mendelian Genetics, and Chromosomal Inheritance: Study Guide

Study Guide - Practice Questions

Study Guide - Flashcards