Question 1

Which of the following best describes the primary function of the endomembrane system in eukaryotic cells?

Accepted Answer

Synthesis, modification, transport, and secretion of proteins and lipids

Question 2

A liver cell is exposed to a high concentration of a toxic drug. Which organelle is most responsible for detoxifying this substance?

Accepted Answer

Smooth endoplasmic reticulum

Question 3

Which process involves the cell taking in large particles, such as bacteria, by engulfing them in a vesicle?

Accepted Answer

Phagocytosis

Question 4

Lysosomes are known as the cell's recycling centers. Which of the following best explains their role in autophagy?

Accepted Answer

They break down damaged organelles for reuse of their components

Question 5

Which of the following is NOT a function of the central vacuole in plant cells?

Accepted Answer

Detoxification of drugs

Question 6

A vesicle containing a fragment of a damaged mitochondrion is most likely destined for which organelle for degradation?

Accepted Answer

Lysosome

Question 7

Which cytoskeletal filament is primarily responsible for muscle contraction and cell movement?

Accepted Answer

Actin filaments (microfilaments)

Question 8

Which equation best represents the process of peptide bond formation between two amino acids?

Accepted Answer

$$\mathrm{Amino\ acid}_1 + \mathrm{Amino\ acid}_2 \rightarrow \mathrm{Dipeptide} + H_2O$$

Question 9

Which of the following best explains how proteins are targeted to specific locations within the endomembrane system?

Accepted Answer

By signal sequences and molecular tags

Question 10

A paramecium uses contractile vacuoles to regulate its internal environment. What is the primary function of these vacuoles?

Accepted Answer

Expulsion of excess water to maintain osmotic balance

Question 11

Which of the following statements about the cytoskeleton is TRUE?

Accepted Answer

It provides structural support, shape, and motility to the cell

Question 12

Which pathway correctly describes the movement of a protein destined for secretion from a eukaryotic cell?

Accepted Answer

Rough ER $$\rightarrow$$ Golgi apparatus $$\rightarrow$$ Secretory vesicle $$\rightarrow$$ Plasma membrane

Question 13

Which of the following is a real-life example of phagocytosis?

Accepted Answer

Amoeba engulfing a food particle

Question 14

Which organelle is most directly involved in the synthesis of steroid sex hormones in reproductive organs?

Accepted Answer

Smooth endoplasmic reticulum

Question 15

Which of the following best describes the difference between exocytosis and endocytosis?

Accepted Answer

Exocytosis expels molecules from the cell, while endocytosis brings them in

Question 16

Which cytoskeletal filament is most important for separating chromosomes during cell division?

Accepted Answer

Microtubules

Question 17

A mutation prevents the formation of lysosomes in a cell. Which cellular process would be most directly affected?

Accepted Answer

Digestion and recycling of macromolecules

Question 18

Which of the following equations represents the hydrolysis of a peptide bond?

Accepted Answer

$$\mathrm{Dipeptide} + H_2O \rightarrow \mathrm{Amino\ acid}_1 + \mathrm{Amino\ acid}_2$$

Question 19

Which of the following is a function shared by both plant central vacuoles and fungal vacuoles?

Accepted Answer

Storage and digestion

Eukaryotic Cells: Structure, Function, and Evolution – Endomembrane System & Cytoskeleton

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