$$Osmolarity = \frac{\text{Total moles of solute particles}}{\text{Volume of solution (L)}}$$

Question 1

Which of the following best describes the Fluid Mosaic Model of the plasma membrane?

Accepted Answer

A bilayer of phospholipids with embedded proteins that move freely, creating a dynamic and flexible membrane.

Question 2

A red blood cell is placed in a hypotonic solution. What will happen to the cell, and which concept explains this phenomenon?

Accepted Answer

The cell will swell and may burst because water moves into the cell by osmosis.

Question 3

Which organelle is primarily responsible for ATP production in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 4

Which of the following membrane proteins is most directly involved in cell-to-cell recognition?

Accepted Answer

Glycoproteins

Question 5

During protein synthesis, what is the role of tRNA?

Accepted Answer

Carries amino acids to the ribosome and matches them to the coded mRNA message.

Question 6

Which equation correctly represents the calculation of osmolarity in a solution?

Accepted Answer

$$Osmolarity = \frac{	ext{Total moles of solute particles}}{	ext{Volume of solution (L)}}$$

Question 7

Which of the following best describes the function of desmosomes in the plasma membrane?

Accepted Answer

Anchor adjacent cells together, providing mechanical strength.

Question 8

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

Protein synthesis for export or membrane insertion

Question 9

Which phase of the cell cycle is characterized by DNA replication?

Accepted Answer

S phase

Question 10

What is the primary function of lysosomes in a cell?

Accepted Answer

Digest and recycle cellular waste and foreign material

Question 11

Which of the following statements about facilitated diffusion is correct?

Accepted Answer

It uses membrane proteins to move substances down their concentration gradient.

Question 12

Which of the following is NOT a function of the plasma membrane?

Accepted Answer

Providing a rigid structure for the cell

Question 13

During mitosis, which stage is characterized by the alignment of chromosomes along the equator of the cell?

Accepted Answer

Metaphase

Question 14

Which of the following best explains the role of the sodium-potassium pump in maintaining the resting membrane potential?

Accepted Answer

It actively transports $$3 Na$^+$$ out and $$2 K$^+$$ into the cell, creating an electrochemical gradient.

Question 15

Which of the following is a correct description of apoptosis?

Accepted Answer

Programmed cell death that is essential for development and homeostasis.

Question 16

Which of the following is a function of microtubules in the cytoskeleton?

Accepted Answer

Provide tracks for organelle movement and are involved in chromosome separation during cell division.

Question 17

Which of the following best describes the role of the nucleolus?

Accepted Answer

Site of ribosome synthesis

Question 18

A mutation causes a cell to lose its ability to form tight junctions. Which tissue function would be most affected?

Accepted Answer

Prevention of leakage between adjacent cells

Question 19

Which of the following is a real-world example of exocytosis?

Accepted Answer

A neuron releasing neurotransmitters into the synaptic cleft.

Question 20

Which theory of aging suggests that the progressive shortening of telomeres limits the number of times a cell can divide?

Accepted Answer

Genetic theory (Telomere clock)

Cell Structure, Function, and Life Cycle: Study Notes for Anatomy & Physiology

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