Question

Parallel β sheets differ from antiparallel β sheets because:

a. neighboring amino acids are on one rather than both sides of the sheet.

b. the N-to-C orientation of all the β strands are aligned.

c. parallel sheets can form between a single polypeptide.

d. large aromatic groups are only allowed with parallel sheets.

A cross of a red-eyed female fly carrying the white-eye allele with a wild-type, red-eyed male could produce all of the following EXCEPT (assume nondisjunction does not)

a. Red-eyed male

b. Red-eyed female

c. White-eyed female

d. White-eyed male

Which of the following molecules mediates a major exception to the flow of information outlined in the central dogma (DNA→RNA→protein)?

a. mRNA

b. ribosomes

c. reverse transcriptase

d. RNA polymerase

You are attempting to break down glucose in vitro in your biology lab. You are using the enzyme that does this in nature and adding the right amount of glucose under physiological conditions, but you are unable to detect any product—even though your detector is working. Select the best explanation from those below for your problem.

a. You have accidentally added the wrong enantiomer of glucose; this enantiomer, therefore, is not able to lower the activation energy of the enzyme—so the reaction can’t occur and no product is obtained.

b. You have accidentally added the wrong enantiomer of glucose; this enantiomer, therefore, cannot form specific interactions at the active site of the enzyme, and no product results.

c. You have accidentally added the wrong enantiomer of glucose; this enantiomer, therefore, is not fully dissolving, so the enzyme can’t bind the glucose and can’t produce product.

d.You have accidentally added the wrong enantiomer of glucose; it converts to the natural enantiomer in solution, but the wrong one serves as an inhibitor at the active site, and no product results.

Answer 1

Ans 1) b option is correct , N to C orientation of all beta strand are aligned.

Ans 2) iption c is correct , white eye female , pass gene in criss cross manner and can only pass from mother to male offspring.

Ans 3) option c is correct , reverse transcriptase

Reason- reverse transcriptase is an enzyme which form DNA from RNA.so it is exception to the flow in central dogma.

Ans 4) b option is correct ,you have accidentaly added wrong enantiomer of glucose this enantiomer therefore cannot form specific interaction at the active site of the enzyme and no product results .