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9 Qs

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Created by

Dr Varadarajan

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9 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

1. Which of the following is a characteristic of facilitated diffusion?
a) Requires energy in the form of ATP
b) Moves substances against their concentration gradient
c) Involves transport proteins
d) Moves molecules at the same rate regardless of concentration

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

2. Which of the following best describes the function of a channel protein in a cell membrane?
a) Transports molecules against their concentration gradient
b) Forms a pore through which specific molecules or ions can pass
c) Binds to molecules and changes shape to shuttle them across the membrane
d) Hydrolyzes ATP to provide energy for transport

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which statement is true regarding facilitated diffusion?
a) It requires energy input from the cell.
b) It can transport molecules against their concentration gradient.
c) It requires a transport protein to move substances across the membrane.
d) It is slower than simple diffusion because it involves transport proteins.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Ion channels that open in response to a change in membrane potential are called:
a) Ligand-gated channels
b) Voltage-gated channels
c) Mechanically-gated channels
d) Aquaporins

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Aquaporins are specialized for the transport of which molecule across the cell membrane?
a) Glucose
b) Ions
c) Water
d) Amino acids

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Ionophores are often used in research to:
a) Study water transport across membranes
b) Induce ion imbalance in cells
c) Block aquaporin channels
d) Enhance protein synthesis

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Ionophores are molecules that:
a) Bind to and transport ions across the cell membrane
b) Block ion channels in the membrane
c) Act as receptors for hormones
d) Facilitate the diffusion of water across the membrane

8.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The antibiotic valinomycin is an example of:
a) An aquaporin
b) A channel protein
c) An ionophore
d) A receptor protein

9.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following ionophores specifically facilitates the transport of potassium ions (K+)?
a) Gramicidin
b) Monensin
c) Valinomycin
d) A23187