Cell Bio - Exam 3

Front

What are the main types of active transport?

Back

Light-driven, ATP-driven, Coupled

Front

What is the function of leaky K+ channels?

Back

They allow potassium ions to leak out of the cell, maintaining the resting membrane potential.

Front

How does an action potential/signal switch from electrical to chemical?

Back

Through the release of neurotransmitters at the synapse.

Front

What part of an alpha helix is hydrophilic?

Back

The backbone.

Front

What are the ways to restrict protein movement in the membrane?

Back

By anchoring proteins to the cytoskeleton, forming tight junctions, and using lipid rafts.

Front

Define endocytosis.

Back

The process by which cells internalize substances from their external environment.

Front

What is exocytosis?

Back

The process of vesicles fusing with the plasma membrane to release their contents outside the cell.

Front

Explain the role of ATP in active transport.

Back

ATP provides the energy required to move substances against their concentration gradient.

Front

What is the significance of neurotransmitters in signal transmission?

Back

They transmit signals across synapses from one neuron to another.

Front

Define hydrophilic and hydrophobic in the context of cell membranes.

Back

Hydrophilic refers to molecules that interact well with water, while hydrophobic refers to molecules that do not.