01-28 Ch 05b Active Transport Rev. Ques

Primary active transport gets its energy from:
Normal kinetic energy of matter
Potential energy stored in a concentration gradient
Hydrolysis of ATP
No energy is needed

Active transport creates equilibrium. Question options: True False

False

Which of the following statements regarding active transport is FALSE? options:
It moves a solute against its concentration gradient. I
It always requires ATP.
It requires the input of energy.
It always requires a carrier protein.

always requires ATP.

The ECF concentration of Ca2+ is 2.5 mmol/L, and the free cytosolic concentration of Ca2+ is 0.001 mmol/L. If the cell is going to move Ca2+ ions from its cytosol to the ECF, what kind of transport will it use?
Question options: Active Passive

Active

The Na+-K+ pump is an example of: Question options: A uniporter A symporter An antiporter

An antiporter

Which statement below most correctly describes the ion movement by the Na+-K+ pump?
Question options: Moves two Na+ in, and three K+ out Moves three Na+ in, and two K+ out Moves two K+ in, and three Na+ out Moves three K+ in, and two Na+ out

Moves two K+ in, and three Na+ out

In the Na+-K+ pump, sodium is moving ____________ its concentration gradient, and potassium is moving __________ its concentration gradient.
Question options: Against / against Against / with With / against With / with

Against / agains

In the SGLT transporter, sodium is moving ____________ its concentration gradient, and glucose is moving __________ its concentration gradient. Question options: Against / against Against / with With / against With / with

With / against

The SGLT transporter represents secondary active transport because: Question options: It directly requires ATP. It is a symporter of sodium and glucose. It relies on the concentration gradient of glucose to move sodium. It relies on the concentration gradient of sodium to move glucose.

It relies on the concentration gradient of sodium to move glucose.

In a typical epithelium, the _____________ face the ECF. Question options: Apical membranes Basolateral membranes Tight junctions Microvilli

Basolateral membranes

Which of the following best describes paracellular absorption?
Question options:
A molecule moving into the ECF between cells
A molecule moving into the lumen between cells
A molecule moving into the ECF through a cell
A molecule moving into the lumen through a cell

A molecule moving into the ECF between cells

A typical resting cell is most permeable to which ion? Question options: Na+ Cl- K+ Ca2+

K+

If a typical cell were suddenly made permeable to Na+, what would happen? Question options: Na+ influx, cell hyperpolarizes Na+ influx, cell depolarizes Na+ efflux, cell hyperpolarizes Na+ efflux, cell depolarizes

Na+ influx, cell depolarizes

Cl- is usually kept OUT of a cell. Predict what would happen to the resting membrane potential if a cell increased permeability to Cl-? Question options: Hyperpolarize Depolarize

Hyperpolarize

Ca²⁺ is usually kept OUT of a cell. Predict what would happen to the resting membrane potential if a cell increased permeability to Ca²⁺?
Question options: Hyperpolarize Depolarize No change

Depolarize