Q: Which equation correctly represents the net movement of sodium and potassium ions by the sodium-potassium pump?

$3\ \mathrm{Na}^+\ \text{out},\ 2\ \mathrm{K}^+\ \text{in}$

Question 1

Which of the following best describes the fluid mosaic model of the plasma membrane?

Accepted Answer

A dynamic structure with proteins embedded in or attached to a bilayer of phospholipids.

Question 2

A red blood cell is placed in a hypotonic solution. What is the most likely outcome?

Accepted Answer

The cell will swell and may burst as water enters.

Question 3

Which of the following substances can diffuse directly through the plasma membrane without the need for a transport protein?

Accepted Answer

Oxygen

Question 4

The sodium-potassium pump is an example of which type of transport?

Accepted Answer

Primary active transport

Question 5

Which equation correctly represents the net movement of sodium and potassium ions by the sodium-potassium pump?

Accepted Answer

$3\ \mathrm{Na}^+\ 	ext{out},\ 2\ \mathrm{K}^+\ 	ext{in}$

Question 6

Which type of cell junction allows ions and small molecules to pass directly between adjacent cells, facilitating electrical signaling in cardiac muscle?

Accepted Answer

Gap junctions

Question 7

During receptor-mediated endocytosis, which molecule is responsible for recognizing and binding specific ligands?

Accepted Answer

Receptor protein

Question 8

Which process best describes secondary active transport?

Accepted Answer

Movement of molecules against their concentration gradient using energy from another molecule moving down its gradient.

Question 9

Which of the following is a correct base pairing between mRNA codon and tRNA anticodon during translation?

Accepted Answer

mRNA codon: $\mathrm{AUG}$, tRNA anticodon: $\mathrm{UAC}$

Question 10

Which enzyme is primarily responsible for synthesizing new DNA strands during replication?

Accepted Answer

DNA polymerase

Question 11

Which statement best describes the semiconservative model of DNA replication?

Accepted Answer

Each new DNA molecule consists of one parental and one new strand.

Question 12

Which type of RNA carries amino acids to the ribosome during protein synthesis?

Accepted Answer

tRNA

Question 13

A mutation changes the DNA sequence from $\mathrm{TAC}$ to $\mathrm{TAT}$. What is the most likely effect on the protein produced?

Accepted Answer

The mutation may be silent due to genetic code redundancy.

Question 14

Which connective tissue type is characterized by a rigid extracellular matrix and is essential for structural support in the body?

Accepted Answer

Bone

Question 15

Which germ layer gives rise to the epithelial lining of the digestive tract?

Accepted Answer

Endoderm

Question 16

Which of the following best describes the role of the signal recognition particle (SRP) in protein synthesis?

Accepted Answer

It directs ribosomes to the endoplasmic reticulum for membrane or secretory protein synthesis.

Question 17

Which of the following is a function of lysosomes in the cell?

Accepted Answer

Intracellular digestion of macromolecules

Question 18

Which equation represents the general formula for glycolysis, the breakdown of glucose to pyruvate?

Accepted Answer

$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 2\ \mathrm{NAD}^+ + 2\ \mathrm{ADP} + 2\ \mathrm{P}_i \rightarrow 2\ \mathrm{C}_3\mathrm{H}_4\mathrm{O}_3 + 2\ \mathrm{NADH} + 2\ \mathrm{ATP} + 2\ \mathrm{H}_2\mathrm{O}$

Question 19

Which type of epithelial tissue is best suited for rapid diffusion and is found lining the alveoli of the lungs?

Accepted Answer

Simple squamous epithelium

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