princeton review missed questions

Which of the following best describes the secondary structure of a protein?

A) Various folded polypeptide chains joining together to form a larger unit

B) The amino acid sequence of the chain

C)The polypeptide chain folding upon itself due to hydrophobic/hydrophilic interactions

D) Peptide bonds hydrogen-bonding to one another to create a sheet-like structure

Peptide bonds hydrogen-bonding to one another to create a sheet-like structure

A genetic regulator is found to contain a lysine residue that is important for its binding to DNA. If a mutation were to occur such that a different amino acid replaces the lysine at that location, which of the following resulting amino acids would likely be the least harmful to its ability to bind DNA?

Glycine

Glutamate

Aspartate

Arginine

Arginine (this is because lysine is basic and so is arginine!)

A human space explorer crash-lands on a planet where the native inhabitants are entirely unable to digest glycogen, but are able to digest cellulose. Consequently, they make their clothing out of glycogen-based material.

The starving space explorer eats one of the native inhabitants' shirts and the natives are amazed. Based on this information, which of the following is/are true?

I. The explorer can digest a-glycosidic linkages.

II. The native inhabitants can digest a-glycosidic

linkages.

III. The native inhabitants can digest starch.

A) I only

B) I and III only

C) Il and III only

D) I, II, and III

I only ( three is wrong because starch also has alpha glycosidic linkages)

If NADP+ is fully hydrolyzed to its component bases, phosphates, and sugars, what type of monosaccharide would result?

A) A three-carbon triose

B) A hexose

C)A pentose

D) An a-D-glucose

A pentose (NADH is made of ribose which is a pentose)

in a given cell the photosynthetic dark phase were

cell would most likely experience:

artificially arrested while the light phase proceeded, the

A) decreased levels of NADPH.

B) increased levels of NADPH.

C)increased levels of carbohydrate.

D) increased photoactivation of the chloroplast.

Increased levels of NADPH (light phase makes it and dark phase consumes it!