Q: Which equation correctly represents the calculation of membrane potential using the Nernst equation for a single ion?

$$E = \frac{RT}{zF} \ln \left( \frac{[\text{ion}]_{\text{outside}}}{[\text{ion}]_{\text{inside}}} \right)$$

Question 1

Which of the following best describes the fluid-mosaic model of the cell membrane?

Accepted Answer

A dynamic structure where proteins and lipids move freely within a bilayer.

Question 2

A cell is placed in a hypertonic solution. Predict the direction of water movement and explain the outcome for the cell.

Accepted Answer

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

Question 3

Which equation correctly represents the calculation of membrane potential using the Nernst equation for a single ion?

Accepted Answer

$$E = \frac{RT}{zF} \ln \left( \frac{[	ext{ion}]_{	ext{outside}}}{[	ext{ion}]_{	ext{inside}}} ight)$$

Question 4

Which of the following is a function of transmembrane proteins in cell signaling?

Accepted Answer

They serve as receptors that transmit signals across the membrane.

Question 5

A neuron receives multiple excitatory and inhibitory signals. Which process determines whether an action potential will be generated?

Accepted Answer

Summation of graded potentials at the axon hillock.

Question 6

Which of the following best distinguishes passive transport from active transport across a cell membrane?

Accepted Answer

Passive transport moves substances down their concentration gradient, while active transport moves substances against their gradient using energy.

Question 7

Which of the following is an example of negative feedback in the endocrine system?

Accepted Answer

High blood glucose stimulates insulin release, which lowers blood glucose, reducing further insulin secretion.

Question 8

Which statement correctly describes the role of the sodium-potassium pump in maintaining resting membrane potential?

Accepted Answer

It moves sodium ions out of the cell and potassium ions into the cell, using ATP.

Question 9

Which of the following best explains why lipid-soluble hormones can pass through the plasma membrane while water-soluble hormones cannot?

Accepted Answer

Lipid-soluble hormones can dissolve in the hydrophobic core of the membrane, allowing them to pass through.

Question 10

A cell is exposed to a signaling molecule that triggers a cascade involving cAMP as a second messenger. What is the primary function of cAMP in this pathway?

Accepted Answer

To amplify the signal by activating protein kinases.

Question 11

Which of the following best describes the process of exocytosis?

Accepted Answer

The release of substances from the cell via vesicle fusion with the plasma membrane.

Question 12

Which equation represents the relationship between osmotic pressure ($$\Pi) $$and solute concentration ($$C) in a $$solution?

Accepted Answer

$$\Pi = CRT$$

Question 13

Which of the following is NOT a function of glial cells in the nervous system?

Accepted Answer

Transmitting electrical impulses between neurons.

Question 14

During the transmission of a nerve impulse, which event occurs first?

Accepted Answer

Depolarization due to sodium influx.

Question 15

Which of the following best describes the role of sensory receptor cells in the sensory system?

Accepted Answer

They convert external stimuli into changes in membrane potential.

Question 16

Which of the following is a correct sequence of the stages of cell signaling?

Accepted Answer

Reception, Transduction, Response

Question 17

Which of the following best explains why the same signaling molecule can lead to different responses in different cell types?

Accepted Answer

Different cells have different receptors and intracellular signaling pathways.

Question 18

Which of the following is a correct description of the function of the autonomic nervous system (ANS)?

Accepted Answer

It regulates involuntary functions such as heart rate and digestion.

Question 19

Which of the following best describes the difference between exocytosis and endocytosis?

Accepted Answer

Exocytosis releases substances from the cell, while endocytosis brings substances into the cell.

General Biology Study Guide: Membranes, Cell Signaling, Endocrine System, Nervous System, and Senses

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