Question 1

Which of the following best describes the amphipathic nature of phospholipids in the cell membrane?

Accepted Answer

Phospholipids have both hydrophilic and hydrophobic regions, allowing them to form bilayers in water.

Question 2

A patient is diagnosed with a genetic disorder affecting the function of carrier proteins in their cell membranes. Which process would be most directly impaired?

Accepted Answer

Active transport of glucose into the cell

Question 3

Which organelle is primarily responsible for packaging and modifying proteins for secretion?

Accepted Answer

Golgi apparatus

Question 4

During transcription, which molecule is synthesized from a DNA template?

Accepted Answer

mRNA

Question 5

Which of the following substances can most easily cross the lipid bilayer of the cell membrane without the aid of a protein channel?

Accepted Answer

Oxygen

Question 6

A cell is observed to have an extensive network of rough endoplasmic reticulum. What is the most likely function of this cell?

Accepted Answer

Production of large amounts of secreted proteins

Question 7

Which cytoskeletal element is most directly involved in the movement of chromosomes during mitosis?

Accepted Answer

Microtubules

Question 8

If a cell's lysosomes are nonfunctional, which cellular process would be most affected?

Accepted Answer

Degradation of damaged organelles

Question 9

Which of the following best explains why ions such as $\mathrm{Na^+}$ and $\mathrm{K^+}$ cannot freely cross the cell membrane?

Accepted Answer

They are polar and the hydrophobic core of the membrane repels them.

Question 10

A mutation prevents the formation of the glycocalyx on a cell's surface. Which function would be most compromised?

Accepted Answer

Cell recognition and specificity in binding

Question 11

Which organelle is responsible for aerobic respiration and produces the majority of cellular ATP?

Accepted Answer

Mitochondrion

Question 12

A cell is unable to synthesize ribosomal RNA. Which structure is most likely defective?

Accepted Answer

Nucleolus

Question 13

Which of the following is a function of microvilli on the surface of epithelial cells in the small intestine?

Accepted Answer

Increase surface area for absorption

Question 14

Which process involves the fusion of a vesicle with the plasma membrane to release its contents outside the cell?

Accepted Answer

Exocytosis

Question 15

A protein destined for degradation in the cytoplasm is tagged with which molecule before being processed by the proteasome?

Accepted Answer

Ubiquitin

Question 16

Which of the following best describes the role of the nuclear pores?

Accepted Answer

They allow free movement of ions and molecules between the nucleus and cytoplasm.

Question 17

During translation, which molecule brings amino acids to the ribosome according to the mRNA codon sequence?

Accepted Answer

tRNA

Question 18

Which of the following equations correctly represents the net ATP yield from aerobic respiration in mitochondria per glucose molecule?

Accepted Answer

$\mathrm{C_6H_{12}O_6} + 6\mathrm{O_2} \rightarrow 6\mathrm{CO_2} + 6\mathrm{H_2O} + 36\mathrm{ATP}$

Question 19

A cell is observed to have defective intermediate filaments. Which property of the cell is most likely compromised?

Accepted Answer

Cell strength and structural integrity

Question 20

Which of the following best describes the triplet code in DNA?

Accepted Answer

Three nucleotides code for one amino acid.

Cellular Level of Organization: Structure and Function in Anatomy & Physiology

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