Q: A cell is actively pumping sodium ions out and potassium ions in, against their concentration gradients. Which equation best represents the energy requirement for this process?

$$ATP \rightarrow ADP + P_i + \text{energy}$$

Question 1

Which statement best describes the Cell Theory as it applies to human biology?

Accepted Answer

Cells are the smallest functioning units of life, produced by division of preexisting cells, and each cell maintains homeostasis.

Question 2

A scientist observes a cell with no true nucleus and no membrane-bound organelles. Which type of cell is being observed?

Accepted Answer

Prokaryotic cell

Question 3

Which of the following is a function of the plasma membrane in eukaryotic cells?

Accepted Answer

Regulating entry and exit of substances through selective permeability

Question 4

The phospholipid bilayer of the cell membrane is described as a 'fluid mosaic.' What does this mean?

Accepted Answer

Proteins and lipids can move laterally within the layer, creating a dynamic and flexible structure.

Question 5

Which organelle is responsible for packaging and sorting proteins for transport within or out of the cell?

Accepted Answer

Golgi apparatus

Question 6

A cell is placed in a hypertonic solution. What will happen to the cell?

Accepted Answer

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

Question 7

Which process requires energy to move substances against their concentration gradient?

Accepted Answer

Active transport

Question 8

A patient is experiencing edema, which is excess tissue fluid. Which process is most directly involved in the movement of water that leads to edema?

Accepted Answer

Filtration due to pressure differences across capillary membranes

Question 9

Which equation best represents the central dogma of molecular biology?

Accepted Answer

$$DNA \rightarrow RNA \rightarrow Protein$$

Question 10

Which of the following is NOT a function of proteins synthesized in the rough endoplasmic reticulum?

Accepted Answer

Calcium storage

Question 11

A cell uses carrier proteins to move glucose from a region of high concentration to low concentration. Which type of transport is this?

Accepted Answer

Facilitated diffusion

Question 12

Which part of the phospholipid bilayer faces the extracellular and intracellular fluids?

Accepted Answer

Hydrophilic polar heads

Question 13

Which organelle is most directly involved in cellular energy production?

Accepted Answer

Mitochondria

Question 14

During phagocytosis, what is the cell primarily doing?

Accepted Answer

Engulfing large particles or other cells

Question 15

Which of the following best explains why the plasma membrane is selectively permeable?

Accepted Answer

It regulates entry and exit of substances based on size, charge, and solubility.

Question 16

A cell is actively pumping sodium ions out and potassium ions in, against their concentration gradients. Which equation best represents the energy requirement for this process?

Accepted Answer

$$ATP ightarrow ADP + P_i + 	ext{energy}$$

Question 17

Which cell structure is primarily responsible for maintaining the shape and movement of eukaryotic cells?

Accepted Answer

Cytoskeleton

Question 18

Which of the following scenarios best illustrates passive transport?

Accepted Answer

Oxygen diffuses from the bloodstream into muscle cells without energy input.

Question 19

Which organelle contains digestive enzymes to break down waste and cellular debris?

Accepted Answer

Lysosome

Question 20

A cell in the kidney filters small molecules out of the blood but retains large proteins. Which process is responsible for this selective movement?

Accepted Answer

Filtration

Chapter 3: Cells – Structure, Function, and Diversity

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