Question 1

According to the fluid mosaic model, which molecules primarily form the bilayer structure of the cell membrane?

Accepted Answer

Phospholipids

Question 2

A patient with cystic fibrosis has difficulty breathing due to thick secretions in the lungs. Which cellular mechanism is directly affected in this disorder?

Accepted Answer

Defective chloride ion channels

Question 3

Which membrane protein, composed of glycoproteins and glycolipids, is essential for cell recognition and immune response?

Accepted Answer

Marker molecules

Question 4

A red blood cell placed in a solution swells and bursts. What is the tonicity of the solution relative to the cell?

Accepted Answer

Hypotonic

Question 5

Which substances can diffuse directly through the lipid bilayer of the cell membrane without the need for channel proteins?

Accepted Answer

Carbon dioxide and oxygen

Question 6

The sodium-potassium pump is vital for maintaining cellular homeostasis. Which of the following best describes its function?

Accepted Answer

All of these

Question 7

Which organelle is responsible for producing large amounts of ATP, especially in cells with high energy demands?

Accepted Answer

Mitochondria

Question 8

A cell synthesizing large amounts of lipids would be expected to have an abundance of which organelle?

Accepted Answer

Large amounts of smooth ER

Question 9

During DNA replication, which enzyme is responsible for adding new nucleotides to the growing DNA strand?

Accepted Answer

DNA polymerase

Question 10

In the process of transcription, what is the template from which mRNA is synthesized?

Accepted Answer

DNA

Question 11

Which sequence of nucleotides is the anticodon for the mRNA codon AUG (methionine)?

Accepted Answer

UAC

Question 12

Which of the following is NOT a result of mitosis?

Accepted Answer

2 haploid cells are formed

Question 13

Which genotype represents a homozygous dominant individual?

Accepted Answer

AA

Question 14

A person with the genotype $$AA$$ for a dominant trait mates with a person with genotype $$aa. $$What is the expected genotype of their offspring?

Accepted Answer

$$Aa$$

Question 15

Which blood group system is an example of codominance, where all three alleles can be expressed simultaneously?

Accepted Answer

ABO blood groups

Question 16

A child is diagnosed with Down syndrome. Which chromosomal abnormality is responsible for this condition?

Accepted Answer

Extra chromosome #21

Question 17

Which statement about X-linked hemophilia is correct?

Accepted Answer

Both b and c

Question 18

Brown eyes are inherited as a dominant trait. If two brown-eyed parents both carry the recessive allele for blue eyes, what is the probability that their child will have blue eyes? Use a Punnett square to justify your answer.

Accepted Answer

25%

Question 19

A cell is placed in a solution and water moves into the cell by osmosis. Which equation best describes the net movement of water ($$J) $$across the membrane, given the osmotic pressure difference ($$\Delta \pi) $$and membrane permeability ($$P$$)?

Accepted Answer

$$J = P 	imes \Delta \pi$$

Question 20

During translation, which of the following statements is true?

Accepted Answer

All of these

Cellular Biology and Genetics Study Guide – Step-by-Step Guidance

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