Q: Which of the following equations correctly represents the relationship between osmolarity, solute concentration, and water movement across a membrane?

$$Osmolarity = \frac{\text{Number of solute particles}}{\text{Volume of solution}}$$

Question 1

Which organelle is primarily responsible for ATP production through aerobic respiration in human cells?

Accepted Answer

Mitochondrion

Question 2

A scientist observes a cell with an extensive network of rough endoplasmic reticulum (ER). What is the most likely function of this cell?

Accepted Answer

Production of secreted proteins

Question 3

Which of the following best describes the structure of the plasma membrane?

Accepted Answer

A bimolecular layer of lipids and proteins in a fluid mosaic

Question 4

Which type of membrane junction allows for the direct passage of ions and small molecules between adjacent cells, such as in cardiac muscle?

Accepted Answer

Gap junction

Question 5

A red blood cell is placed in a solution and begins to swell and eventually bursts. What type of solution was the cell placed in?

Accepted Answer

Hypotonic

Question 6

Which process requires energy in the form of ATP to move substances against their concentration gradient?

Accepted Answer

Active transport

Question 7

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

Accepted Answer

Interphase

Question 8

Which cytoskeletal element is composed of actin and is involved in cell movement and shape changes?

Accepted Answer

Microfilaments

Question 9

A patient has a genetic defect that prevents the formation of lysosomes. Which cellular process would be most directly affected?

Accepted Answer

Digestion of cellular debris and pathogens

Question 10

Which of the following best explains why the plasma membrane is described as a 'fluid mosaic'?

Accepted Answer

It consists of a dynamic arrangement of lipids and proteins that can move laterally.

Question 11

Which organelle is responsible for modifying, concentrating, and packaging proteins and lipids for secretion or delivery to other organelles?

Accepted Answer

Golgi apparatus

Question 12

A cell is observed to have an abundance of peroxisomes. Which function is this cell most likely specialized for?

Accepted Answer

Detoxification of harmful substances

Question 13

Which of the following is a function of integral membrane proteins?

Accepted Answer

Serve as transport channels or carriers

Question 14

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

Accepted Answer

Site of rRNA synthesis and ribosome subunit assembly

Question 15

A mutation disrupts the function of the Na+-K+ pump in a neuron. What is the most likely immediate consequence?

Accepted Answer

The cell will lose its ability to maintain proper ion gradients across the membrane.

Question 16

Which of the following processes is illustrated by the movement of water across a semipermeable membrane toward a higher solute concentration?

Accepted Answer

Osmosis

Question 17

Which cytoskeletal element is primarily responsible for resisting mechanical stress and maintaining cell shape?

Accepted Answer

Intermediate filaments

Question 18

A cell is observed to have a large number of microvilli. What is the most likely function of this cell?

Accepted Answer

Absorption of nutrients

Question 19

Which of the following best describes the process of translation?

Accepted Answer

Converting the base sequence of mRNA into an amino acid sequence in the cytoplasm

Question 20

Which of the following equations correctly represents the relationship between osmolarity, solute concentration, and water movement across a membrane?

Accepted Answer

$$Osmolarity = \frac{	ext{Number of solute particles}}{	ext{Volume of solution}}$$

Chapter 3: Cells – The Living Units (BSC 2085 Human Anatomy and Physiology I)

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