Question 1

Which organelle is primarily responsible for producing ATP, the cell's main energy currency, and how does its structure facilitate this function?

Accepted Answer

Mitochondria; its double membrane creates compartments for the electron transport chain, enabling efficient ATP synthesis.

Question 2

A patient is experiencing muscle weakness due to a genetic disorder affecting the sarcoplasmic reticulum. Which cellular process is most likely impaired?

Accepted Answer

Storage and release of calcium ions necessary for muscle contraction.

Question 3

Which of the following best describes the function of the Golgi apparatus in a neuron?

Accepted Answer

It modifies, sorts, and packages proteins for secretion or use within the cell.

Question 4

A cell is observed to have an abundance of lysosomes. What is the most likely function of this cell?

Accepted Answer

Intracellular digestion and recycling of cellular waste.

Question 5

Which cellular extension is responsible for moving mucus out of the respiratory tract, and what is its structural basis?

Accepted Answer

Cilia; composed of microtubules arranged in a specific pattern that enables movement.

Question 6

Which process allows water to move across the plasma membrane from an area of low solute concentration to high solute concentration, and what is the driving force?

Accepted Answer

Osmosis; driven by the concentration gradient of solutes.

Question 7

A patient with hyponatremia (low sodium) receives intravenous fluids. Which transport mechanism will allow water to enter their cells if the intracellular sodium concentration is higher than extracellular?

Accepted Answer

Osmosis

Question 8

Which mechanism is responsible for moving potassium ions into cells against their concentration gradient, as in the treatment of hypokalemia?

Accepted Answer

Active transport

Question 9

Which of the following best describes the difference between primary and secondary active transport?

Accepted Answer

Primary active transport uses ATP directly, while secondary active transport uses the energy from another particle moving down its gradient.

Question 10

Which equation best represents the relationship for simple diffusion across a membrane?

Accepted Answer

$J = -D \frac{dC}{dx}$

Question 11

A cell is placed in a hypertonic solution. What will happen to the cell, and which process is responsible?

Accepted Answer

The cell will lose water and shrink due to osmosis.

Question 12

Which organelle is most involved in detoxifying hydrogen peroxide into water and oxygen?

Accepted Answer

Peroxisome

Question 13

Which of the following is NOT a function of the plasma membrane?

Accepted Answer

Synthesizing proteins for export

Question 14

Which cellular extension increases surface area for absorption in intestinal cells?

Accepted Answer

Microvilli

Question 15

Which organelle is responsible for assembling ribosome components before they are exported to the cytoplasm?

Accepted Answer

Nucleolus

Question 16

Which type of transport is used when glucose is moved into a cell along with sodium ions, utilizing the energy from sodium moving down its gradient?

Accepted Answer

Secondary active transport

Question 17

Which equation describes the rate of facilitated diffusion for a solute using a carrier protein?

Accepted Answer

$v = V_{max} \frac{[S]}{K_m + [S]}$

Question 18

During endocytosis, which of the following best describes the process?

Accepted Answer

The cell engulfs extracellular material by forming vesicles from the plasma membrane.

Question 19

Which of the following is a correct statement about chromatin?

Accepted Answer

Chromatin consists of DNA and histone proteins, organizing genetic material within the nucleus.

Question 20

Which organelle is responsible for generating the mitotic spindle during cell division?

Accepted Answer

Centrosome

Cell Biology: Structure and Function of the Cell for Psychology Students

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