Question 1

Which of the following best describes the difference between membranous and non-membranous organelles in a eukaryotic cell?

Accepted Answer

Membranous organelles are surrounded by a plasma membrane, isolating them from the cytosol, whereas non-membranous organelles are in direct contact with the cytosol.

Question 2

A scientist observes a cell structure that is not surrounded by a membrane and is in direct contact with the cytosol. Which of the following is most likely being observed?

Accepted Answer

Ribosome

Question 3

Which organelle is responsible for producing ATP and is classified as a membranous organelle?

Accepted Answer

Mitochondrion

Question 4

A cell loses its ability to maintain its shape and support its internal structure. Which cellular component is most likely malfunctioning?

Accepted Answer

Cytoskeleton

Question 5

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

Accepted Answer

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

Question 6

A patient’s cells are unable to properly isolate certain chemical reactions from the rest of the cytosol. Which organelle type is most likely defective?

Accepted Answer

Membranous organelles

Question 7

Which of the following is NOT a function of the cytoskeleton?

Accepted Answer

Synthesizing proteins

Question 8

If a cell’s plasma membrane is damaged, which of the following processes would be most directly affected?

Accepted Answer

Regulation of material entry and exit

Question 9

Which of the following best explains why cells are typically small in size?

Accepted Answer

To maximize the surface area-to-volume ratio, facilitating efficient exchange of materials.

Question 10

A researcher is studying a cell that contains both membranous and non-membranous organelles. Which of the following combinations is correct?

Accepted Answer

Mitochondria and ribosomes

Question 11

Which of the following statements about the nucleus is correct?

Accepted Answer

The nucleus includes organelles and cytosol.

Question 12

A cell is observed to have a high concentration of ribosomes attached to its endoplasmic reticulum. What is the most likely function of this cell?

Accepted Answer

Protein synthesis for export

Question 13

Which of the following is a real-world consequence of a defective cytoskeleton in human cells?

Accepted Answer

Impaired cell division leading to developmental disorders

Question 14

A cell is exposed to a toxin that disrupts its plasma membrane. Which equation best describes the change in permeability ($$P) if $$the membrane thickness ($$d) $$increases, assuming permeability is inversely proportional to thickness?

Accepted Answer

$$P \propto \frac{1}{d}$$

Question 15

Which of the following organelles is most directly involved in modifying, sorting, and packaging proteins for secretion?

Accepted Answer

Golgi apparatus

Question 16

A cell is observed to have an extensive network of smooth endoplasmic reticulum. Which function is most likely enhanced in this cell?

Accepted Answer

Lipid synthesis

Question 17

Which of the following best describes the role of vesicles in a cell?

Accepted Answer

They transport materials between organelles and to the plasma membrane.

Question 18

A cell is unable to break down waste materials and cellular debris. Which organelle is most likely malfunctioning?

Accepted Answer

Lysosome

Question 19

Which of the following is a non-membranous organelle that plays a key role in cell division?

Accepted Answer

Centrosome

Question 20

A cell is observed to have a damaged plasma membrane but intact organelles. Which process is most likely to be disrupted first?

Accepted Answer

Selective transport of ions and molecules

Cellular Organelles: Membranous vs Non-Membranous Structures

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