Question 1

Which of the following best describes the function of the plasma membrane in human cells?

Accepted Answer

It serves as a selectively permeable boundary, allowing the cell to respond to changes in the extracellular environment and regulate entry and exit of substances.

Question 2

A patient is diagnosed with a genetic disorder affecting the structure of desmosomes in epithelial cells. Which symptom would most likely result from this condition?

Accepted Answer

Cells would be more prone to tearing under mechanical stress, especially in tissues like skin and digestive tract.

Question 3

Which of the following molecules can most easily cross the plasma membrane via simple diffusion?

Accepted Answer

Oxygen ($$\mathrm{O_2$})$$

Question 4

A cell is placed in a solution with higher osmolarity than its cytoplasm. What will happen to the cell?

Accepted Answer

Water will move out of the cell, causing it to shrink.

Question 5

Which equation correctly represents the calculation of osmolarity ($$O) $$for a solution containing $$n$$ solute particles per liter?

Accepted Answer

$$O = \frac{n}{V}$$, where $$V is $$the volume in liters

Question 6

Which of the following transport mechanisms requires cellular energy (ATP) and moves substances against their concentration gradient?

Accepted Answer

Primary active transport (e.g., sodium-potassium pump)

Question 7

A neuron releases neurotransmitters into the synaptic cleft. Which cellular process is responsible for this release?

Accepted Answer

Exocytosis

Question 8

Which organelle is most abundant in muscle cells due to their high energy requirements?

Accepted Answer

Mitochondria

Question 9

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

Accepted Answer

Synthesis and export of proteins

Question 10

Which of the following best describes the role of the glycocalyx on the plasma membrane?

Accepted Answer

It serves as a 'name tag' for cell recognition and interaction.

Question 11

During which phase of the cell cycle does DNA replication occur?

Accepted Answer

S phase

Question 12

Which of the following is NOT a function of the smooth endoplasmic reticulum?

Accepted Answer

Protein synthesis for export

Question 13

A cell is unable to digest bacteria it engulfs. Which organelle is most likely malfunctioning?

Accepted Answer

Lysosome

Question 14

Which of the following best explains why sodium ions ($$\mathrm{Na^+}) $$require active transport to move out of the cell?

Accepted Answer

$$\mathrm{Na^+}$$ must be moved against its concentration gradient, which requires ATP.

Question 15

Which cellular structure is responsible for organizing microtubules and is essential for cell division?

Accepted Answer

Centrosome

Question 16

Which of the following is a correct sequence of events during mitosis?

Accepted Answer

Prophase → Metaphase → Anaphase → Telophase

Question 17

Which of the following best describes facilitated diffusion?

Accepted Answer

Movement of molecules down their concentration gradient via carrier or channel proteins, without ATP.

Question 18

A cell in the small intestine absorbs nutrients from the lumen. Which form of endocytosis is most likely involved?

Accepted Answer

Pinocytosis

Question 19

Which of the following statements about the nucleus is correct?

Accepted Answer

It contains the genetic instructions for building all proteins required by the cell.

Question 20

Which of the following best explains the importance of selective permeability in the plasma membrane?

Accepted Answer

It enables the cell to maintain homeostasis by regulating which molecules can enter or leave.

Cell Structure and Function: Foundations of Anatomy & Physiology

Guida di studio - Domande di pratica

Study guide - Flashcard