Q: Which equation best represents the amphipathic nature of a phospholipid molecule in the plasma membrane?

$$\text{Phospholipid} = \text{Hydrophilic head} + \text{Hydrophobic tail}$$

Question 1

Which of the following best describes the structure and function of the plasma membrane in eukaryotic cells?

Accepted Answer

It is a bilayer of amphipathic phospholipids with hydrophilic heads facing outward and hydrophobic tails facing inward, regulating the movement of substances into and out of the cell.

Question 2

Which organelle is primarily responsible for the synthesis of proteins that are destined for secretion or insertion into the cell membrane?

Accepted Answer

Rough endoplasmic reticulum

Question 3

A mutation causes a cell to lack tubulin. Which cellular structure would be most affected?

Accepted Answer

Microtubules

Question 4

Which of the following correctly matches the cytoskeletal component with its primary function?

Accepted Answer

Microtubules – form cilia and flagella, and are involved in organelle transport

Question 5

Which of the following membrane junctions allows for the direct passage of ions and small molecules between adjacent cells?

Accepted Answer

Gap junctions

Question 6

A researcher observes that a cell is unable to maintain its shape and internal organization. Which cytoskeletal element is most likely defective?

Accepted Answer

Cytoskeleton

Question 7

Which organelle is responsible for packaging and modifying proteins before they are secreted from the cell?

Accepted Answer

Golgi apparatus

Question 8

A cell is observed to have an abundance of free ribosomes but very few bound ribosomes. What type of proteins is this cell most likely producing?

Accepted Answer

Proteins that function within the cytosol

Question 9

Which of the following best explains the role of the nucleolus within the nucleus?

Accepted Answer

It is the site of ribosome production.

Question 10

If a cell’s peroxisomes are nonfunctional, which process would be most directly impaired?

Accepted Answer

Detoxification of harmful substances

Question 11

Which surface modification increases the surface area of cells for absorption, such as in the lining of the small intestine?

Accepted Answer

Microvilli

Question 12

Which equation best represents the amphipathic nature of a phospholipid molecule in the plasma membrane?

Accepted Answer

$$	ext{Phospholipid} = 	ext{Hydrophilic head} + 	ext{Hydrophobic tail}$$

Question 13

A cell is observed to have many desmosomes. What is the most likely function of these structures?

Accepted Answer

Anchoring cells together to provide mechanical strength

Question 14

Which of the following best describes the difference between cytoplasm and cytosol?

Accepted Answer

Cytosol is the water-based solution inside the cell, while cytoplasm includes the cytosol and all organelles except the nucleus.

Question 15

Which of the following is NOT a component of the endomembrane system?

Accepted Answer

Mitochondria

Question 16

A cell is observed to have a large number of cilia on its surface. What is the most likely function of these cilia?

Accepted Answer

Moving substances across the cell’s surface

Question 17

Which of the following best describes the function of ribosomes attached to the rough ER?

Accepted Answer

They produce proteins for secretion or membrane insertion.

Question 18

Which of the following equations best represents the process of protein synthesis in the cell?

Accepted Answer

$$	ext{DNA} ightarrow 	ext{RNA} ightarrow 	ext{Protein}$$

Question 19

A patient’s skin cells are found to lack intermediate filaments. Which symptom would most likely result?

Accepted Answer

Loss of rigidity and structural support in the skin

Cell Structure: Organelles, Cytoskeleton, and Membrane Junctions

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