1. What is NOT true of an antiport Ca+ transporter protein coupled to Na+? Ca+...
1. What is NOT true of an antiport Ca+ transporter protein coupled to Na+?
Ca+ is being actively transported
The carrier has two binding sites.
Ca+ is moving into the cell.
Ca+ and Na+ are moving in opposite directions.
2.
Which of the following molecules can get across the membrane by simple diffusion?
H+
Cl-
CO2
glucose
3.
Consider the passive transport of lysine into the cell by a carrier transporter. Which of the following statements is NOT TRUE regarding this mechanism?
No energy is required for the transport of lysine.
The transporter has a binding site for Na+.
The transporter is randomly opening and closing on each side of the membrane.
The concentration of lysine is higher outside of the cell
Homework Answers
1. Answer: Option C is correct
Explanation:
Antiport = Two ions/molecules transported in opposite directions
across the membrane with the help of a carrier protein
Sodium-calcium exchanger is an example of secondary active
transport.
It exports one Ca+2 ion out of the cell for every three Na+ ions
entering into the cell.
2. Answer: Option C is correct
Explanation:
Biological membranes are lipid bilayers. They are predominantly
hydrophobic and exhibit semi-permeability. Gases and small nonpolar
molecules can freely diffuse across the membrane. ALl the other
types of molecules (i.e. polar) require a carrier for their
transport across the membrane.
The CO2 molecule is a small nonpolar gas molecule. It can freely
diffuse across the membrane
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