FREE AND STUDY GAMES ABOUT BIOCHEM EXAM 2

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FREE AND STUDY GAMES ABOUT BIOCHEM EXAM 2

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -400 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: O-glycosidic bonds can form a variety of linkages due to what?

Answer:

Use of different OH groups or epimers Question 2: Glycosaminoglycans can be what to give them additional negative charge?

Answer:

Extensively sulfated

Question 3: Electromotive force (emf) is proportional to what?

Answer:

Difference in affinity

Question 4: What are enatiomers?

Answer:

Non super-imposable mirror images

Question 5: Some ketoses that did not get a unique name are named by inserting what immediately prior to the "ose" in the name of the corresponding aldose?

Answer:

"ul" Question 6: In enzymes that have two or more substrates, and are bound in different modes, what are the modes for an enzyme reaction involving a ternary complex?

Answer:

Random order, ordered Question 7: What can help to distinguish between the ping-pong mechanism and mechanism forming a ternary complex?

Answer:

Enzyme kinetics

Question 8: What is Km?

Answer:

Concentration of substrate [S] leading to initial velocity (Vo) that's half maximal velocity (Vmax) Question 9: True/False: Water does directly attack the peptide bond in HIV protease.

Answer:

True

Question 10: What tells you how efficiently an enzyme

catalyzes the reaction in each encounter between E and S, is a second-order constant?

Answer:

Specificity constant Question 11: On key concept of metabolism is that unfavorable reactions are what to allow them to proceed?

Answer:

Coupled with favorable reactions

Question 12: Hydrolysis of thioesters, such as acetyl-CoA, is favorable or unfavorable?

Answer:

Strongly favorable Question 13: In allosteric regulation, why is aspartate (from aspartate transcarbamoylase) positively regulated by heterotropic ATP but negatively regulated by heterotropic CTP?

Answer:

CTP goes through negative feedback, ATP positively ...

Question 14: What specifically arises from specificity pockets?

Answer:

Chymotrypsin, trypsin, elastase Question 15: Enolase uses divalent cations to convert 2-Phosphoglycerate into what?

Answer:

Phosphoenolpyruvate

Question 16: What are diastereomers?

Answer:

Not mirror images of each other, differ in configuration in at least one chiral center (but not all)

Question 17: What are the two types of heteropolysaccharides?

Answer:

Two monomer types (unbranched), multiple monomer types (branched)

Question 18: What is the main storage homopolysaccharide in plants?

Answer:

Starch Question 19: What are sugars that differ in configuration in at least one chiral center but not all?

Answer:

Diastereomers

Question 20: When the lines are parallel on a graph, what kind of inhibition takes place?

Answer:

Uncompetitive inhibition Question 21: In the treatment of methanol poisoning they will give ethanol (alcohol). This is an example of an enzyme's what?

Answer:

Geometric Specificity Question 22: True/False: In the chymotrypsin reaction mechanism, water does not directly attack the peptide bond of the substrate.

Answer:

True Question 23: In the Chymotrypsin mechanism, after His57+ is stabilized, what acts as a nucleophile to attack C=O?

Answer:

Ser195-O(-)

Question 24: Which carbon is drawn on the right by convention?

Answer:

Anomeric Question 25: In the Chymotrypsin mechanism, the nucleophilic attack of alkoxide ion on peptide carbonyl carbon leads to what?

Answer:

Tetrahedral intermediate (acyl-enzyme) Question 26: Ketoses that did not get a unique name are named by inserting what immediately prior to the "ose" in the name of the corresponding aldose?

Answer:

"ul"