Question

1. Which of the following describes a type of transport in which the cell provides a protein transporter or channel, but the transported molecule moves with the concentration gradient?
a. Secondary active transport.
b. Passive transport [facilitated diffusion].
c. Exocytosis.
d. Primary active transport.
e. Simple diffusion.

2. Consider red blood cells suspended in pure distilled water. Which of the following statements is[are] TRUE?
a. The net osmosis of water will be into the cell.
b. The distilled water is isotonic to the blood cells.
c. The movement of water will occur through primary active transport.
d. Answers A and B are correct.
e. All of the above are correct.

3. Transport of glucose in the kidney is accomplished by allowing two molecules of Na+ into the cell along with a molecule of glucose. Which of the following is TRUE?
a. Its secondary active transport.
b. Its a uniporter.
c. Its primary active transport.
d. Its an antiporter.
e. Its facilitated diffusion.

Answer 1

1) This type of transport which needs carrier protein but moves from its high concentration to low concentration gradient is called facilitated diffusion or passive transport.

Primary active transport is against concentration gradient.Secondary active transport uses energy in other form than ATP.

2) If red blood cells are suspended in distilled water , the net osmosis of water will be into the cell. As we know that pure distilledwater is hypotonic solution(Less solutes are present) to the blood cells and the water moves from its high concentration to its lwo concentration.here the distilled water has the high concentraion of water and RBC have low concentrationt of water.So the net movement of water will be from the solution to inside the cells.

3) The glucose transport in the kidneys is accomplished by allowing two molecules of Na+ into the cell along with a molecule of glucose.It is a co transport which is along with its concentration gradient. So it is a type of facilitated diffusion.

Uniport is the transport of only alone one molecule or ion and antiport is the movement of two molecules or ions in opposite directions.