Question 1

Which of the following statements best describes the function of the plasma membrane in a typical human cell?

Accepted Answer

It regulates exchange with the environment, provides isolation, sensitivity, and structural support.

Question 2

A red blood cell is placed in a solution of pure water. What will happen to the cell, and which term best describes this solution?

Accepted Answer

The cell will gain water and burst; the solution is hypotonic.

Question 3

Which organelle is primarily responsible for producing ATP through aerobic metabolism, and what is the significance of its inner membrane?

Accepted Answer

Mitochondrion; its inner membrane forms cristae to increase surface area for metabolic enzymes.

Question 4

Which process describes the movement of water molecules across a selectively permeable membrane from an area of low solute concentration to high solute concentration?

Accepted Answer

Osmosis

Question 5

A cell uses the sodium-potassium exchange pump to maintain homeostasis. If the pump moves 3 $$\mathrm{Na^+}$$ ions out and 2 $$\mathrm{K^+}$$ ions in per ATP molecule hydrolyzed, what type of transport is this?

Accepted Answer

Active transport

Question 6

Which of the following best explains why lipid-soluble molecules can easily cross the plasma membrane, while ions cannot?

Accepted Answer

The plasma membrane is composed of a phospholipid bilayer with hydrophobic tails that repel water-soluble substances.

Question 7

During which phase of the cell cycle does DNA replication occur, and what is the main enzyme involved?

Accepted Answer

S phase; DNA polymerase

Question 8

Which organelle is responsible for modifying and packaging secretions for release, renewing the plasma membrane, and packaging enzymes within vesicles?

Accepted Answer

Golgi apparatus

Question 9

A cell is observed to have many microvilli on its surface. What is the most likely function of this cell?

Accepted Answer

Absorption of extracellular materials due to increased surface area

Question 10

Which of the following best describes the process of receptor-mediated endocytosis?

Accepted Answer

Specific target molecules bind to receptors, forming coated vesicles that are absorbed into the cell.

Question 11

Which cytoskeletal element is primarily responsible for forming the spindle apparatus during cell division?

Accepted Answer

Microtubules

Question 12

What is the main function of lysosomes in a cell?

Accepted Answer

Intracellular removal of damaged organelles or pathogens

Question 13

Which phase of mitosis is characterized by the alignment of paired chromatids along the metaphase plate?

Accepted Answer

Metaphase

Question 14

A mutation causes a cell to lose control over its cell cycle, resulting in rapid, abnormal cell division and the formation of secondary tumors. What is this condition called?

Accepted Answer

Cancer

Question 15

Which organelle is responsible for the breakdown and recycling of damaged or abnormal intracellular proteins?

Accepted Answer

Proteasome

Question 16

During translation, which molecule delivers amino acids to the ribosome, and what is the name of the sequence that matches the mRNA codon?

Accepted Answer

tRNA; anticodon

Question 17

Which of the following equations correctly represents the osmotic pressure ($$\Pi) in $$terms of solute concentration ($$C$$), gas constant ($$R$$), and temperature ($$T$$)?

Accepted Answer

$$\Pi = CRT$$

Question 18

Which process is used by cells to move large molecules, such as proteins, out of the cell by fusing vesicles with the plasma membrane?

Accepted Answer

Exocytosis

Question 19

What is the primary function of the nucleolus within the nucleus?

Accepted Answer

Synthesis of ribosomal RNA and assembly of ribosomal subunits

Question 20

Cellular differentiation is important because it allows cells to:

Accepted Answer

Specialize by turning off specific genes, resulting in a variety of cell types with limited capabilities

Cell Structure and Function: Comprehensive Study Notes

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