Question 1

Which organelle is primarily responsible for producing ATP through aerobic respiration, and what structural feature enhances its efficiency?

Accepted Answer

Mitochondrion; inner membrane folds called cristae

Question 2

A patient with a genetic disorder affecting microtubule formation would most likely have problems with which cellular structures or functions?

Accepted Answer

Movement of cilia and flagella

Question 3

Which of the following best describes the role of peroxisomes in liver cells exposed to high levels of ethanol?

Accepted Answer

They oxidize toxic substances, producing hydrogen peroxide for detoxification.

Question 4

During muscle contraction, which organelle is responsible for storing and releasing calcium ions ($$\mathrm{Ca$$^{2+}$$}$$)?

Accepted Answer

Smooth endoplasmic reticulum (SER)

Question 5

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

Accepted Answer

Synthesis and modification of proteins for export

Question 6

Which of the following correctly matches the cytoskeletal filament with its primary function?

Accepted Answer

Intermediate filaments: form permanent structures and provide mechanical strength

Question 7

If a cell's Golgi apparatus is damaged, which process would be most directly affected?

Accepted Answer

Sorting and packaging of proteins and lipids for export

Question 8

Which equation best represents the overall reaction for aerobic respiration occurring in mitochondria?

Accepted Answer

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

Question 9

Which cellular extension is most important for increasing the surface area of cells in the small intestine for absorption?

Accepted Answer

Microvilli

Question 10

A cell is unable to digest worn-out organelles and macromolecules. Which organelle is most likely malfunctioning?

Accepted Answer

Lysosome

Question 11

Which of the following statements about ribosomes is correct?

Accepted Answer

Ribosomes consist of two subunits made of rRNA and proteins.

Question 12

Which organelle is responsible for synthesizing most of the cell's membrane components, including phospholipids and cholesterol?

Accepted Answer

Smooth endoplasmic reticulum (SER)

Question 13

A mutation causes the nuclear envelope to lack nuclear pores. What is the most immediate consequence for the cell?

Accepted Answer

Substances cannot move between the nucleoplasm and cytoplasm.

Question 14

Which of the following best explains why muscle cells contain more mitochondria than skin cells?

Accepted Answer

Muscle cells require more ATP for contraction.

Question 15

Which structure is formed by a 9+2 arrangement of microtubules and is essential for movement in certain cells?

Accepted Answer

Cilia

Question 16

Which organelle is most directly involved in the process of autophagy?

Accepted Answer

Lysosome

Question 17

Which of the following is NOT a function of the smooth endoplasmic reticulum (SER)?

Accepted Answer

Protein synthesis

Question 18

What is the primary function of the nucleolus within the nucleus?

Accepted Answer

Assembly of ribosomes

Question 19

Which cytoskeletal filament is most important for cellular motion, especially in muscle contraction?

Accepted Answer

Actin filaments (microfilaments)

Question 20

During cell division, what structure forms to help organize microtubules and ensure proper chromosome separation?

Accepted Answer

Centrosome containing centrioles

Cell Physiology: Cytoplasmic Organelles and Cellular Structures

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