Q: Which organelle is responsible for the synthesis of ATP through aerobic metabolism, and what is the overall chemical equation for this process?

Mitochondrion; $$ \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2 \rightarrow 6\text{CO}_2 + 6\text{H}_2\text{O} + \text{ATP} $$

Question 1

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

Accepted Answer

It acts as a barrier, regulating exchange with the environment and providing structural support.

Question 2

A cell is placed in a solution and begins to swell until it ruptures. Which type of solution is the cell most likely in?

Accepted Answer

Hypotonic solution

Question 3

Which organelle is responsible for the synthesis of ATP through aerobic metabolism, and what is the overall chemical equation for this process?

Accepted Answer

Mitochondrion; $$ 	ext{C}_6	ext{H}_{12}	ext{O}_6 + 6	ext{O}_2 ightarrow 6	ext{CO}_2 + 6	ext{H}_2	ext{O} + 	ext{ATP} $$

Question 4

Which of the following best explains why water moves more rapidly across the plasma membrane than solutes during osmosis?

Accepted Answer

Aquaporins are more abundant than solute channels, facilitating water movement.

Question 5

A patient is given an intravenous solution that is hypertonic compared to their blood plasma. What is the most likely effect on their red blood cells?

Accepted Answer

The cells will lose water and shrink (crenation).

Question 6

Which organelle is primarily responsible for packaging and modifying proteins for secretion, and what is its role in renewing the plasma membrane?

Accepted Answer

Golgi apparatus; packages proteins and renews/modifies the plasma membrane.

Question 7

During protein synthesis, which strand of DNA is used as a template for mRNA production, and what is the name of the process?

Accepted Answer

Template strand; transcription

Question 8

Which of the following best describes the function of microvilli on the surface of epithelial cells in the small intestine?

Accepted Answer

They increase surface area to facilitate absorption of nutrients.

Question 9

A cell is actively transporting sodium ions out and potassium ions in, against their concentration gradients. Which transport mechanism is being used, and what is the stoichiometry of ions moved per ATP?

Accepted Answer

Sodium-potassium exchange pump; 3 Na+ out, 2 K+ in per ATP

Question 10

Which of the following is a function of the glycocalyx on the plasma membrane?

Accepted Answer

Providing lubrication and protection, and functioning in cell recognition

Question 11

Which process involves the engulfment of large particles, such as bacteria, by a cell using pseudopodia?

Accepted Answer

Phagocytosis

Question 12

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

Accepted Answer

Hydrophobic tails are located inside the membrane, forming a barrier to water-soluble compounds.

Question 13

Which organelle contains enzymes that break down fatty acids and produces hydrogen peroxide, which is then converted to water and oxygen?

Accepted Answer

Peroxisome

Question 14

A mutation in the gene encoding a carrier protein prevents glucose from entering the cell. Which transport process is directly affected?

Accepted Answer

Facilitated diffusion

Question 15

Which of the following best describes the role of the nucleus in a eukaryotic cell?

Accepted Answer

It stores genetic information and controls cell activities by regulating gene expression.

Question 16

Which of the following is TRUE regarding the difference between somatic cells and sex cells?

Accepted Answer

Sex cells include sperm and oocytes, while somatic cells comprise all other body cells.

Question 17

Which of the following best explains the concept of selective permeability of the plasma membrane?

Accepted Answer

It restricts movement based on size, charge, molecular shape, and lipid solubility.

Question 18

During translation, what is the role of tRNA, and how does it interact with mRNA?

Accepted Answer

tRNA delivers amino acids to the ribosome by binding its anticodon to a complementary mRNA codon.

Question 19

Which cytoskeletal component is responsible for forming the spindle apparatus during cell division and moving organelles within the cell?

Accepted Answer

Microtubules

Question 20

A cell is exposed to a toxin that inhibits the function of its lysosomes. Which cellular process would be most directly affected?

Accepted Answer

Digestion and recycling of damaged organelles and molecules

Cellular Level of Organization: Structure and Function of Cells

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