Please give reason why you choose the answer Which of the following metabolites
ID: 5927 • Letter: P
Question
Please give reason why you choose the answerWhich of the following metabolites would you expect to enter the cell by simple diffusion?
a. glucose
b. HPO4-
c. steric acid, CH3-(CH2)16-COOH
d. phenylalanine
Which statement is FALSE about the transport of substances across a cell membrane?
a. Facilitated diffusion requires a membrane bound protein that allows specific metabolites to cross the membrane.
b. Active transport is only used to transport metabolites into the cell.
c. Active transport of metabolites requires an energy source.
d. The energy that drives facilitated diffusion is the difference in concentration of the metabolite on either side of the membrane.
From the abbreviated name of the compound glucosamine (beta 1 ? 2)-fucose, we know that:
a. the C-2 hydroxyl of fucose is joined to C-1 of glucosamine by a glycosidic bond.
b. the glucosamine is at the reducing end.
c. the fucose residue is the alpha-anomer.
d. both sugars are the D-form.
Explanation / Answer
Which of the following metabolites would you expect to enter the cell by simple diffusion? Answer: Glucose. Explanation: Glucose is small enough to diffuse into the cell. Which statement is FALSE about the transport of substances across a cell membrane? b. Active transport is only used to transport metabolites into the cell. Explanation: Active transport is used to transport metabolites against a concentration gradient. It can be bi-directional. From the abbreviated name of the compound glucosamine (beta 1 ? 2)-fucose, we know that: a. the C-2 hydroxyl of fucose is joined to C-1 of glucosamine by a glycosidic bond.