Each DNA strand has a backbone that consists of alternating _____

a. amino acids
b. nitrogen-containing bases
c. hydrogen bonds
d. sugar and phosphate molecules
e. types of sugars


ANSWER: d

Biology & Microbiology

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All of the following are true of the natural killer cells

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Catabolite repression refers to the repression of the lac operon in the presence of which catabolite?

What will be an ideal response?

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What type of blood vessel is solely responsible for exchange between the blood and the interstitial fluid?

A) artery B) arteriole C) capillary D) venule

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Of the following fermentation pathways, which can be carried out by human muscle cells?

A) alcoholic B) butanediol C) lactic acid: homolactic D) lactic acid: heterolactic E) mixed acid

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