Question 1

Which of the following best explains why the surface area-to-volume ratio limits the maximum size of a cell?

Accepted Answer

As a cell grows, its volume increases faster than its surface area, reducing the efficiency of material exchange across the membrane.

Question 2

The Miller-Urey experiment in 1953 provided evidence for which of the following hypotheses about the origin of life?

Accepted Answer

Abiotic synthesis of organic molecules is possible under certain early Earth conditions.

Question 3

Which of the following statements about the endosymbiont theory is supported by evidence from modern mitochondria and chloroplasts?

Accepted Answer

Both organelles contain circular DNA and ribosomes similar to those found in bacteria.

Question 4

A scientist is studying a newly discovered microorganism that thrives in extremely salty environments and has membrane lipids with ether linkages. To which domain does this organism most likely belong?

Accepted Answer

Archaea

Question 5

Which of the following best describes the role of ribozymes in the 'RNA world' hypothesis?

Accepted Answer

They are RNA molecules capable of catalyzing chemical reactions, including self-replication.

Question 6

A mutation causes a eukaryotic cell to lose its ability to form vesicles for endocytosis. Which of the following processes would be most directly affected?

Accepted Answer

Uptake of extracellular macromolecules into the cell

Question 7

Which of the following equations correctly represents the relationship between the surface area ($$A) $$and volume ($$V) of a $$spherical cell with radius $$r$$?

Accepted Answer

$$A = 4 \pi r^2$, V$$ = \frac{4}{3} \pi $$r^3$$

Question 8

Which of the following features is unique to eukaryotic cells and not found in either bacteria or archaea?

Accepted Answer

Membrane-bounded organelles such as mitochondria and Golgi apparatus

Question 9

A patient is diagnosed with a genetic disorder that results in the accumulation of long-chain fatty acids in their cells. Which organelle is most likely defective?

Accepted Answer

Peroxisome

Question 10

Which of the following statements about viruses is correct?

Accepted Answer

Viruses rely on host cell machinery for replication and protein synthesis.

Question 11

Which of the following best explains why eukaryotic cells can be larger than prokaryotic cells?

Accepted Answer

Eukaryotic cells use compartmentalization via organelles to localize and concentrate reactants.

Question 12

A researcher isolates a cell with the following characteristics: a single circular chromosome, no membrane-bound organelles, and cell walls containing peptidoglycan. To which group does this cell most likely belong?

Accepted Answer

Bacteria

Question 13

Which of the following is a function of the Golgi apparatus in eukaryotic cells?

Accepted Answer

Processing and packaging of proteins for secretion or delivery to other organelles

Question 14

Which of the following best describes the main structural difference between the plasma membrane of most archaea and that of bacteria and eukaryotes?

Accepted Answer

Archaeal membranes often have ether-linked lipids forming monolayers, while bacteria and eukaryotes have ester-linked lipid bilayers.

Question 15

A plant cell is observed to have lost turgor pressure and appears wilted. Which organelle is most directly responsible for maintaining turgor pressure in plant cells?

Accepted Answer

Central vacuole

Question 16

Which of the following is a correct match between a cell structure and its primary function?

Accepted Answer

Rough endoplasmic reticulum – Synthesis of membrane and secretory proteins

Question 17

Which of the following best explains why ribosomes from eukaryotic cells have a sedimentation coefficient of 80S, while those from bacteria have a coefficient of 70S?

Accepted Answer

Eukaryotic ribosomes are larger and have more rRNA and protein components than bacterial ribosomes.

Question 18

A viroid differs from a virus in that a viroid:

Accepted Answer

Is a small, circular RNA molecule that does not encode proteins

Question 19

Which of the following is a real-world example supporting the endosymbiont theory for the origin of mitochondria?

Accepted Answer

Mitochondria contain their own circular DNA and ribosomes similar to those of aerobic purple bacteria.

Question 20

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

Accepted Answer

It provides structural support, facilitates cell movement, and organizes organelles within the cytoplasm.

The Cell: Structure, Function, and Origins – A Comprehensive Overview

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