Question 1

Which of the following best explains why eukaryotic cells have organelles?

Accepted Answer

Organelles allow for the separation of incompatible chemical reactions and increase the efficiency of cellular processes.

Question 2

A scientist discovers a cell with a single circular chromosome, no membrane-bound nucleus, and ribosomes. Which domain does this cell most likely belong to?

Accepted Answer

Bacteria

Question 3

Which of the following structures is responsible for synthesizing proteins that are exported out of the cell?

Accepted Answer

Ribosomes attached to the rough endoplasmic reticulum

Question 4

A mutation prevents the formation of the nuclear localization signal (NLS) on a protein. What is the most likely consequence?

Accepted Answer

The protein will not be transported into the nucleus.

Question 5

Which of the following best describes the function of lysosomes in animal cells?

Accepted Answer

They contain acid hydrolases that break down macromolecules and recycle cellular components.

Question 6

A plant cell is observed to have a large central vacuole. Which of the following is NOT a function of this organelle?

Accepted Answer

Synthesis of ribosomal RNA

Question 7

Which of the following provides the strongest evidence for the endosymbiotic theory regarding the origin of mitochondria and chloroplasts?

Accepted Answer

They contain their own DNA and ribosomes similar to those of bacteria.

Question 8

During receptor-mediated endocytosis, what is the correct sequence of events for the internalization and digestion of a macromolecule?

Accepted Answer

Binding to receptor → vesicle formation → fusion with early endosome → acidification → fusion with lysosome

Question 9

Which cytoskeletal element is primarily responsible for the movement of vesicles within eukaryotic cells?

Accepted Answer

Microtubules

Question 10

A cell is observed to have an extensive rough endoplasmic reticulum and a large number of Golgi apparatus. What is the most likely function of this cell?

Accepted Answer

Secretion of proteins such as digestive enzymes or hormones

Question 11

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

Accepted Answer

It provides structural support, aids in cell movement, and organizes organelles.

Question 12

Which process is responsible for the recycling of damaged organelles within a cell?

Accepted Answer

Autophagy

Question 13

A mutation in a cell prevents the formation of microtubule organizing centers (MTOCs). Which of the following processes would be most directly affected?

Accepted Answer

Separation of chromosomes during cell division

Question 14

Which of the following statements about the plasma membrane is correct?

Accepted Answer

It is a selectively permeable barrier composed of a phospholipid bilayer with embedded proteins.

Question 15

Which of the following is a function of the smooth endoplasmic reticulum (SER)?

Accepted Answer

Synthesis and breakdown of lipids

Question 16

A cell is observed to have a high number of peroxisomes. Which of the following is the most likely function of this cell?

Accepted Answer

Detoxification of harmful substances

Question 17

Which of the following best describes the function of the Golgi apparatus?

Accepted Answer

It processes, sorts, and ships proteins synthesized in the rough ER.

Question 18

Which of the following equations best represents the conversion of chemical energy in mitochondria?

Accepted Answer

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

Question 19

Which of the following is a unique feature of prokaryotic cells compared to eukaryotic cells?

Accepted Answer

They lack membrane-bound organelles.

Question 20

Which of the following best explains why the structure of a cell correlates with its function?

Accepted Answer

Cells with many mitochondria are specialized for energy production, while cells with extensive rough ER are specialized for protein secretion.

Inside the Cell: Structure and Function of Cellular Components

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