Cell Membrane Proteins Quiz

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What type of transport does not require the cell to expend energy?

Primary active transport

Secondary active transport

Simple diffusion (correct)

Facilitated diffusion

In ligand-gated ion channels, what triggers the opening of the channel for ion transport?

Active transport of ions

Passive transport of ions

A change in membrane potential (correct)

Conformational changes in the protein

Which type of transport moves molecules against an energy gradient?

Facilitated diffusion

Secondary active transport

Primary active transport (correct)

Simple diffusion

What role do carriers or transporters play in facilitated diffusion?

Bind with molecules or ions and assist in their transport Signup and view all the answers

At the neuromuscular junction, what initiates the release of acetylcholine into the synaptic cleft?

Action potential in the motor neuron Signup and view all the answers

Secondary active transport differs from primary active transport in that it:

Does not directly use cellular energy Signup and view all the answers

What type of proteins are responsible for facilitated diffusion of sugars, amino acids, and nucleosides?

Carrier proteins Signup and view all the answers

Which statement is true about facilitated diffusion?

The rate of diffusion is proportional to the concentration of the diffusing substance. Signup and view all the answers

What is one key characteristic of carrier proteins in facilitated diffusion?

They are specific in the substrates they act upon. Signup and view all the answers

In facilitated diffusion, what determines the maximum rate of transport?

The number of carrier proteins available in the membrane. Signup and view all the answers

Which type of transport pathway best describes carrier proteins in facilitated diffusion?

Uniport Signup and view all the answers

How do carrier proteins differ from channel proteins in facilitated diffusion?

Channel proteins undergo conformational changes to facilitate transport. Signup and view all the answers

What are the ions that are important for cellular reactions and the operation of cellular control mechanisms?

Potassium, magnesium, phosphate Signup and view all the answers

What is the main function of membrane potential in excitable cells?

Transmit electrochemical impulses Signup and view all the answers

Which protein is responsible for controlling fluidity and permeability in the lipid bilayer?

Cholesterol Signup and view all the answers

Which organelle is responsible for synthesizing new protein molecules in cells?

Endoplasmic reticulum Signup and view all the answers

What is the main function of peroxisomes in cells?

Synthesis of bile acids Signup and view all the answers

In which type of transport do sodium molecules move against their concentration gradient?

Secondary active transport Signup and view all the answers

What is the process by which ligand-gated ion channels open in response to a specific molecule binding?

Signal transduction Signup and view all the answers

Action potential in the neuromuscular junction is primarily due to the influx of which ion?

$Na^+$ (Sodium) Signup and view all the answers

Primary active transport involves the direct use of cellular energy, usually in the form of:

ATP hydrolysis Signup and view all the answers

What happens to water-soluble substances when they encounter a lipid bilayer?

They are usually unable to penetrate. Signup and view all the answers