Question 1

Which of the following best describes the role of a G protein in a G protein-coupled receptor (GPCR) signaling pathway?

Accepted Answer

It transmits the signal from the activated receptor to an enzyme or ion channel inside the cell by binding GTP.

Question 2

A researcher observes that a certain hormone is released into the bloodstream and affects target cells throughout the body. Which type of signaling is this an example of?

Accepted Answer

Hormonal (endocrine) signaling

Question 3

Which of the following events occurs during the S phase of interphase in the eukaryotic cell cycle?

Accepted Answer

DNA is replicated, resulting in duplicated chromosomes.

Question 4

Which process is responsible for the genetic variation observed in offspring produced by sexual reproduction?

Accepted Answer

Crossing over during meiosis

Question 5

A cell biologist is studying a mutant strain of yeast that cannot undergo apoptosis. Which of the following outcomes is most likely in this strain?

Accepted Answer

The yeast cells will accumulate damaged or unwanted cells, potentially leading to abnormal growth.

Question 6

Which of the following best explains why mitosis is sometimes called 'duplication division'?

Accepted Answer

It produces two daughter cells that are genetically identical to the parent cell.

Question 7

A human cell with 47 chromosomes is most likely the result of which event during meiosis?

Accepted Answer

Nondisjunction

Question 8

Which of the following statements about the Law of Independent Assortment is correct?

Accepted Answer

It states that alleles of different genes assort independently during gamete formation.

Question 9

A woman who is a carrier for the X-linked recessive allele for hemophilia (X	extsuperscript{H}X	extsuperscript{h}) and a man who does not have hemophilia (X	extsuperscript{H}Y) have a son. What is the probability that their son will have hemophilia?

Accepted Answer

$$\frac{1}{2}$$

Question 10

Which of the following best describes the difference between chromatin and chromosomes in eukaryotic cells?

Accepted Answer

Chromatin is DNA wrapped around proteins and is less condensed during interphase, while chromosomes are highly condensed structures visible during cell division.

Question 11

Which of the following is a real-life example of pleiotropy in humans?

Accepted Answer

Sickle-cell disease, where a single gene affects multiple traits such as anemia, pain, and resistance to malaria

Question 12

During which phase of meiosis does crossing over occur, and what is its significance?

Accepted Answer

Prophase I; it increases genetic variation by exchanging genetic material between homologous chromosomes

Question 13

Which of the following best describes the function of protein kinases in signal transduction pathways?

Accepted Answer

They add phosphate groups to proteins, often activating or deactivating them.

Question 14

A plant cell is observed forming a cell plate during cytokinesis. What is the primary function of the cell plate?

Accepted Answer

To develop into a new cell wall that separates the two daughter cells

Question 15

Which of the following scenarios illustrates epistasis?

Accepted Answer

A gene for pigment production masks the expression of a gene for pigment color in Labrador retrievers.

Question 16

If a cell has a diploid number of 8 chromosomes, how many chromosomes will each gamete have after meiosis?

Accepted Answer

$$4$$

Question 17

Which of the following best explains why Down syndrome occurs?

Accepted Answer

An extra copy of chromosome 21 due to nondisjunction

Question 18

Which of the following is a function of apoptosis during normal vertebrate development?

Accepted Answer

Formation of webbed fingers and toes by removing unneeded cells

Question 19

A scientist is studying a cell that divides by binary fission. Which type of organism is this cell most likely from?

Accepted Answer

A prokaryotic bacterium

Question 20

Which of the following best describes the role of second messengers such as cyclic AMP ($$cAMP) in $$cell signaling?

Accepted Answer

They relay and amplify signals from receptors to target molecules inside the cell.

Cell Communication, Cell Cycle, Meiosis, and Mendelian Genetics: Study Notes

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