1. Which of the following statements about DNA is false? a) DNA contains deoxyri

Question

1. Which of the following statements about DNA is false?

a) DNA contains deoxyribose as its sugar

b) DNA contains the base thymine

c) DNA is double-stranded

d) DNA exists as an alpha-helix

e) None of the above

2. If glucose needs to enter a cell:

a) it will most likely do so by simple diffusion down its concentration gradient.

b) it will most likely require ATP to enter a cell.

c) it will most likely use a protein carrier to cross the lipid bilayer.

d) it will most likely use a hydrophilic pore to cross the lipid bilayer.

e) glucose doesn’t enter cells; they manufacture it.

Explanation / Answer

Answer :

Question number 1 : The correct answer is D (DNA exists as an alpha-helix). Alpha helix is one of the secondary structures found in proteins. In an alpha-helix, the protein chain is coiled like a loosely-coiled spring. The polypeptide backbone is coiled up like a very tight clockwise screw thread or the cord of a telephone.

Features of alpha helix.

Question number 2 : The correct answer is C (it will most likely use a protein carrier to cross the lipid bilayer.)

Supplementary information : Glucose transport in to the cells occurs by facilitated diffusion which is kind of passive transport.Facilitated diffusion transport across the membrane if facilitated by specific permeases in the membrane.Example: Glucose transporter through erythrocyte plasma membrane

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