Question 1

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

Accepted Answer

Mitochondrion; presence of cristae

Question 2

A patient presents with muscle weakness due to impaired calcium storage and release. Which organelle is most likely dysfunctional?

Accepted Answer

Smooth endoplasmic reticulum (sarcoplasmic reticulum)

Question 3

Which of the following best describes the function of peroxisomes in the cell?

Accepted Answer

Neutralization of free radicals via oxidase and catalase enzymes

Question 4

If a cell is unable to break down and recycle worn-out organelles, which organelle is most likely malfunctioning?

Accepted Answer

Lysosome

Question 5

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

Accepted Answer

Protein synthesis for secretion

Question 6

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

Accepted Answer

Secretion of large amounts of protein

Question 7

Which of the following correctly matches the organelle with its function?

Accepted Answer

Lysosome: Intracellular digestion

Question 8

Which equation best represents the detoxification reaction occurring in peroxisomes?

Accepted Answer

$$2H_2O_2 \rightarrow 2H_2O + O_2$

Question 9

Which cellular structure is responsible for organizing microtubules and plays a key role in cell division?

Accepted Answer

Centrosome

Question 10

A cell type is observed to have numerous microvilli. What is the primary advantage provided by these structures?

Accepted Answer

Increased surface area for absorption

Question 11

Which of the following statements about ribosomes is TRUE?

Accepted Answer

Ribosomes are nonmembranous organelles composed of protein and rRNA

Question 12

Which organelle is most directly involved in the modification, sorting, and packaging of proteins for secretion?

Accepted Answer

Golgi apparatus

Question 13

During cell division, chromatin condenses to form chromosomes. What is the primary benefit of this condensation?

Accepted Answer

It protects DNA from damage during division

Question 14

Which of the following is a correct sequence of events for a protein destined for secretion?

Accepted Answer

Synthesis in rough ER → modification in Golgi apparatus → packaging in vesicle → exocytosis

Question 15

Which of the following cell types is anucleate?

Accepted Answer

Red blood cell

Question 16

A genetic disorder affects the nuclear pore complex. Which cellular process would be most directly impaired?

Accepted Answer

Transport of large molecules between nucleus and cytoplasm

Question 17

Which cytoskeletal element is primarily responsible for resisting mechanical stress and maintaining cell shape?

Accepted Answer

Intermediate filaments

Question 18

Which organelle contains its own DNA, RNA, and ribosomes, allowing it to partially self-replicate?

Accepted Answer

Mitochondrion

Question 19

Which of the following is a function of the cytoskeleton?

Accepted Answer

Providing structural support and facilitating movement of cell components

Question 20

A sperm cell uses a long, whip-like extension for motility. Which structure is responsible for this movement, and what is its structural basis?

Accepted Answer

Flagellum; composed of microtubules

Cell Structure and Function: Cytoplasm and Organelles

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