Q: Which equation best represents the sodium-potassium exchange pump?

$$3\ \text{Na}^+_{\text{in}} + 2\ \text{K}^+_{\text{out}} + \text{ATP} \rightarrow 3\ \text{Na}^+_{\text{out}} + 2\ \text{K}^+_{\text{in}} + \text{ADP} + \text{P}_i$$

Question 1

Which of the following best describes the function of the plasma membrane in a human cell?

Accepted Answer

It regulates the passage of substances between the intracellular and extracellular environments.

Question 2

A cell placed in a hypertonic solution will undergo which of the following processes?

Accepted Answer

Water will exit the cell, causing it to shrivel.

Question 3

Which organelle is responsible for the synthesis and storage of glycogen in skeletal muscle and liver cells?

Accepted Answer

Smooth endoplasmic reticulum (SER)

Question 4

During muscle contraction, which cytoskeletal element interacts with myosin?

Accepted Answer

Microfilaments

Question 5

What is the correct sequence for the Central Dogma of Molecular Biology?

Accepted Answer

DNA → mRNA → protein

Question 6

Which of the following is a function of lysosomes?

Accepted Answer

Hydrolyzing organic polymers into monomers

Question 7

A cell with a prominent nucleolus is likely to:

Accepted Answer

Be actively synthesizing proteins

Question 8

Which equation best represents the sodium-potassium exchange pump?

Accepted Answer

$$3\ 	ext{Na}^+_{	ext{in}} + 2\ 	ext{K}^+_{	ext{out}} + 	ext{ATP} ightarrow 3\ 	ext{Na}^+_{	ext{out}} + 2\ 	ext{K}^+_{	ext{in}} + 	ext{ADP} + 	ext{P}_i$$

Question 9

Which of the following statements about facilitated diffusion is correct?

Accepted Answer

It allows large, water-soluble molecules to cross the membrane via carrier proteins.

Question 10

During which phase of the cell cycle does DNA replication occur?

Accepted Answer

S phase

Question 11

Which of the following is NOT a function of the Golgi apparatus?

Accepted Answer

Synthesis of phospholipids and cholesterol

Question 12

Which cytoskeletal element is primarily responsible for forming the spindle apparatus during cell division?

Accepted Answer

Microtubules

Question 13

What is the main function of the nuclear pore complex (NPC)?

Accepted Answer

Regulating the passage of substances between the nucleus and cytoplasm

Question 14

Which of the following best describes the process of osmosis?

Accepted Answer

The net diffusion of water toward the solution with higher solute concentration

Question 15

Which of the following is true regarding the G0 phase of the cell cycle?

Accepted Answer

Stem cells never enter G0.

Question 16

Which of the following is a real-life example of autolysis?

Accepted Answer

A damaged cell self-destructing by releasing lysosomal enzymes.

Question 17

Which of the following statements about the phospholipid bilayer is correct?

Accepted Answer

Hydrophilic heads are in contact with the watery environments inside and outside the cell.

Question 18

Which process allows a cell to import substances against their concentration gradient?

Accepted Answer

Active transport

Question 19

Which of the following best describes the relationship between structure and function at the cellular level?

Accepted Answer

The number of mitochondria in a cell is related to its energy demands.

Question 20

Which of the following is a correct example of a codon-anticodon pairing during translation?

Accepted Answer

mRNA codon: AAA; tRNA anticodon: UUU

The Cellular Level of Organization: Structure and Function of Eukaryotic Cells

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