Understanding Membrane Potential and Receptors

What is the typical value of the resting membrane potential in neurons?

• 0 mV

• -70 mV

• +70 mV

• -90 mV

What type of molecules primarily make up the cell membrane?

• Carbohydrates

• Lipids

• Nucleic acids

• Proteins

Which type of receptor is directly associated with ligand-gated ion channels?

• Ionotropic

• Metabotropic

• Enzymatic

• Nuclear

What is the role of protein channels in the cell membrane?

• To store energy

• To regulate ion movement

• To synthesize proteins

• To replicate DNA

Which of the following is an example of a metabotropic receptor?

• GABA-A receptor

• NMDA receptor

• Dopamine receptor

• Acetylcholine receptor

What is the primary function of second messengers in cellular signaling?

• To store genetic information

• To amplify signals

• To transport oxygen

• To provide structural support

What process describes ions moving from an area of high concentration to an area of low concentration?

• Osmosis

• Diffusion

• Active transport

• Endocytosis

What force causes opposite charges to attract and like charges to repel?

• Gravitational force

• Electrostatic pressure

• Magnetic force

• Nuclear force

Which of the following is a characteristic of ionotropic receptors?

• Slow response

• G-protein-coupled

• Direct ion channel opening

• Involves second messengers

What is the primary component of the lipid bilayer in cell membranes?

• Phospholipids

• Cholesterol

• Glycoproteins

• Nucleotides