Biochemistry

Question: In lysozyme catalysis, which of the following does not contribute?
[A].

The abnormally high pKa of Glu35

[B].

The strained conformation of the D sugar

[C].

Formation of a covalent intermediate at Asp52

[D].

Formation of a covalent intermediate at Ser195

Answer: Option D

Explanation:

No answer description available for this question.

Question: The NAG6 substrate is hydrolyzed by human lysozyme to form
[A].

6 glucosamines + 6 acetic acids

[B].

NAG4 + NAG2

[C].

NAG3 + NAG3

[D].

NAG3

Answer: Option B

Explanation:

No answer description available for this question.

Question: a-amylose is similar to
[A].

β-sheets

[B].

β-turned coils

[C].

α-helices

[D].

the hydrophobic core

Answer: Option C

Explanation:

No answer description available for this question.

Question: Cellulose fibers resemble with the protein structure in the form of
[A].

β-sheets

[B].

α-helices

[C].

β-turns

[D].

None of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: Storage polysaccharide made by animals is
[A].

amylopectin

[B].

glycogen

[C].

cellulose

[D].

collagen

Answer: Option B

Explanation:

No answer description available for this question.

Question: The sugar which forms major component of nucleic acids is
[A].

ribose

[B].

galactose

[C].

mannose

[D].

maltose

Answer: Option A

Explanation:

No answer description available for this question.

Question: The glycosidic bond
[A].

in maltose is not hydrolyzed in lactose intolerant humans

[B].

in sucrose is hydrolyzed by bees

[C].

joins glucose and fructose to form sucrose

[D].

both (b) and (c)

Answer: Option D

Explanation:

No answer description available for this question.

Question: Boat and chair conformations are found
[A].

in pyranose sugars

[B].

in any sugar without axial -OH groups

[C].

in any sugar without equatorial -OH groups

[D].

only in D-glucopyranose

Answer: Option A

Explanation:

No answer description available for this question.

Question: What would be the molecular formula for a polymer made by linking ten glucose molecules together by dehydration synthesis, if molecular formula for glucose is C6H,206?
[A].

C60H100O50

[B].

C60H120O60

[C].

C60H102O51

[D].

(C6H12O6)10

Answer: Option C

Explanation:

No answer description available for this question.

Question: When living organisms are cooled below some critical body temperature, the metabolic reactions within their cells cease to function properly. This malfunction occurs because
[A].

their enzymes lose the proper three-dimensional shape

[B].

enzyme active sites become permanently bound to substrates

[C].

the activation energy for the reaction is raised

[D].

there is insufficient molecular motion for substrates to interact

Answer: Option D

Explanation:

No answer description available for this question.