Question 1

Which of the following statements best explains why eukaryotic cells can carry out more complex metabolic processes than prokaryotic cells?

Accepted Answer

Eukaryotic cells contain membrane-bound organelles that compartmentalize incompatible chemical reactions, increasing efficiency.

Question 2

A scientist discovers a new microorganism with the following characteristics: a single circular chromosome, branched isoprenoid chains in its phospholipids, and ribosomes similar in size to those of bacteria. To which domain does this organism most likely belong?

Accepted Answer

Archaea

Question 3

Which of the following best describes the function of the nuclear localization signal (NLS) in eukaryotic cells?

Accepted Answer

It serves as a 'zip code' that directs proteins to enter the nucleus through nuclear pores.

Question 4

A mutation prevents the formation of acid hydrolases in an animal cell. Which cellular process would be most directly affected?

Accepted Answer

Digestion and recycling of macromolecules in lysosomes

Question 5

Which of the following correctly matches a prokaryotic structure with its function?

Accepted Answer

Nucleoid – region where the main chromosome is located

Question 6

A plant cell is observed to have a large organelle filled with water and ions, and also contains enzymes for breaking down macromolecules. Which organelle is being described?

Accepted Answer

Vacuole

Question 7

Which of the following best explains why mitochondria and chloroplasts are considered semi-autonomous organelles?

Accepted Answer

They contain their own DNA and ribosomes, and can grow and divide independently of the cell.

Question 8

A protein is synthesized on a ribosome attached to the rough endoplasmic reticulum (RER). Which of the following sequences correctly describes its path to secretion outside the cell?

Accepted Answer

RER → Golgi apparatus → transport vesicle → plasma membrane → outside

Question 9

Which process is responsible for the uptake of specific molecules into the cell via binding to membrane receptors, followed by vesicle formation and delivery to the lysosome?

Accepted Answer

Receptor-mediated endocytosis

Question 10

A cell is exposed to a toxin that inhibits the function of catalase. Which of the following consequences is most likely?

Accepted Answer

Accumulation of hydrogen peroxide in peroxisomes, leading to cellular damage

Question 11

Which of the following best describes the role of the cytoskeleton in eukaryotic cells?

Accepted Answer

It is a dynamic network of protein fibers that maintains cell shape, organizes organelles, and enables movement.

Question 12

A mutation causes a defect in the formation of the nuclear lamina. Which of the following cellular processes would be most directly affected?

Accepted Answer

Structural support and organization of the nucleus

Question 13

Which of the following is a key difference between the phospholipids of Bacteria and Archaea?

Accepted Answer

Bacterial phospholipids use fatty acids, while archaeal phospholipids use branched isoprenoid chains.

Question 14

A cell is observed to have extensive internal membrane infoldings containing pigment molecules and enzymes for converting sunlight to chemical energy. This cell is most likely:

Accepted Answer

A photosynthetic prokaryote

Question 15

Which of the following best describes the process of autophagy in eukaryotic cells?

Accepted Answer

Damaged organelles are enclosed within an internal membrane to form an autophagosome, which fuses with a lysosome for digestion.

Question 16

A researcher is studying a protein that is synthesized in the cytosol and functions in the mitochondria. Which of the following must this protein possess to reach its correct destination?

Accepted Answer

A mitochondrial targeting signal

Question 17

Which of the following is NOT a function of the Golgi apparatus?

Accepted Answer

Synthesizing ribosomal RNA

Question 18

A cell is unable to maintain a low pH inside its lysosomes. Which of the following is the most likely consequence?

Accepted Answer

Acid hydrolases will not function efficiently, impairing macromolecule digestion.

Question 19

Which of the following best explains why actin filaments are important for animal cells?

Accepted Answer

They are the most abundant proteins in animal cells and are essential for maintaining cell shape and enabling movement.

Inside the Cell: Structure and Function of Prokaryotic and Eukaryotic Cells

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