Question 1

Which of the following structures is found in both prokaryotic and eukaryotic cells and is primarily responsible for controlling the movement of substances into and out of the cell?

Accepted Answer

Plasma membrane

Question 2

A scientist observes a cell with a nucleoid region, ribosomes, and a plasma membrane, but no membrane-bound organelles. Which type of cell is being observed?

Accepted Answer

Prokaryotic cell

Question 3

Which organelle is the site of ATP production through cellular respiration in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 4

Which of the following is a function of the smooth endoplasmic reticulum (ER) in eukaryotic cells?

Accepted Answer

Lipid synthesis

Question 5

A protein destined for secretion from a eukaryotic cell follows which correct route?

Accepted Answer

Rough ER → Transport vesicle → Golgi apparatus → Plasma membrane

Question 6

Which structure is unique to plant cells and provides rigidity and protection?

Accepted Answer

Cell wall

Question 7

Which of the following is NOT a function of the cytoskeleton in eukaryotic cells?

Accepted Answer

Synthesizing proteins

Question 8

Which cell junction allows the passage of ions and small molecules directly between adjacent animal cells?

Accepted Answer

Gap junction

Question 9

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

Accepted Answer

Golgi apparatus: Modification and sorting of proteins

Question 10

Which equation best represents the process of photosynthesis occurring in chloroplasts?

Accepted Answer

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

Question 11

Which of the following structures is responsible for synthesizing proteins in both prokaryotic and eukaryotic cells?

Accepted Answer

Ribosome

Question 12

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

Accepted Answer

Chromosome separation during mitosis

Question 13

Which of the following is a feature found only in animal cells and not in plant cells?

Accepted Answer

Lysosome

Question 14

Which structure in prokaryotic cells is responsible for movement?

Accepted Answer

Flagella

Question 15

Which of the following statements about the evolutionary origin of mitochondria and chloroplasts is supported by the endosymbiotic theory?

Accepted Answer

They evolved from free-living prokaryotes engulfed by ancestral eukaryotic cells.

Question 16

Which of the following best describes the function of the nucleolus?

Accepted Answer

Ribosome assembly

Question 17

Which process is most directly associated with the rough endoplasmic reticulum (ER)?

Accepted Answer

Protein synthesis for secretion

Question 18

Which of the following cell structures is involved in the breakdown of macromolecules and cellular debris?

Accepted Answer

Lysosome

Question 19

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

Accepted Answer

Microfilaments (actin filaments)

Question 20

Which of the following best explains why plant cells can withstand higher internal pressure than animal cells?

Accepted Answer

Presence of a rigid cell wall

Cell Structure and Function: General Biology Study Notes

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