Biochem

Question 1

Glucose and fructose are examples of?

Answer 1

Single sugars

Question 2

(CH2O)n is the molecular formula for
which type of macromolecules?

Answer 2

Carbohydrates

Question 3

Which of the following is NOT a polysaccharide?

A. Glycogen
B. Starch
C. Sucrose
D. Cellulose

Answer 3

C

Question 4

What is used in animals as a source of quick energy that can be stored in the liver and muscles?

Answer 4

Carbohyrates

Question 5

Sugars, starches, and cellulose belong to which major class of biological molecules?

Answer 5

Carbohydrates

Question 6

Plants like sugar cane and sugar beets store energy as simple sugars. Other plants, like corn and potatoes, store the energy as more complex sugars called?

Answer 6

Starches

Question 7

Which macromolecule does not
dissolve in water?

Answer 7

Lipids

Question 8

What are the monomers of lipids?

Answer 8

Fatty acid and glycerol

Question 9

Lipids are used by the body to perform all of the following functions EXCEPT:

A. membrane structural material.
B. enzyme action.
C. insulation.
D. a rich energy source.

Answer 9

B.

Question 10

What type of organic substances are
fats?

Answer 10

Lipids

Question 11

Fats that have fatty acids with only single covalent bonds in their carbon skeletons are

Answer 11

Saturated

Question 12

Which of the following is a polymer?
A. nucleic acid
B. fatty acid
C. Amino acid
D. Glycerol

Answer 12

A.

Question 13

This biological macromolecule is responsible for controlling the activity of the cell, and it stores and transports genetic information.

Answer 13

Nucleic Acid

Question 14

What are described as the “building
blocks of Protein”?

Answer 14

Amino acids

Question 15

Proteins are____ made of amino acid ____.

A. monomers; polymers
B. polymers; polypeptides
C. polymers; monomers
D. monomers; molecules

Answer 15

C.

Question 16

In this type of structure, most of carbonyl groups of peptide bonds form a hydrogen bond with the amide nitrogen of another
peptide bonds four amino acids further down the polypeptide chain:

Answer 16

Alpha-helix

Question 17

The isoelectric point of an amino acid is defined as the pH
A. where the molecule carries no electric charge
B. where the carboxyl group is uncharged
C. where the amino group is uncharged
D. of maximum electrolytic mobility

Answer 17

A.

Question 18

When the amino acid alanine (R- group is CH3) is added to a solution with a pH of 7.3, alanine becomes

Answer 18

An anion

Question 19

The term “SALTING IN” refers to?

Answer 19

Increasing the solubility of a protein in solution by adding ions.

Question 20

The local spatial arrangement of a polypeptide’s backbone atoms without regard to the conformation of its side chains can be called as

Answer 20

Secondary structure

Question 21

Which of the following is (are) true of beta-turns in proteins?

A. It is a 180 turn of four amino acids.
B. glycine and proline are frequently
found there.
C.Are used as connecting turns of alpha helix
D. All of the above.

Answer 21

D.

Question 22

The primary stabilizing force of
protein secondary structure is:

Answer 22

Hydrogen bonds

Question 23

Two types of beta-pleated sheets can be called:

Answer 23

parallel and antiparallel

Question 24

Which of the following is NOT a characteristic of a globular protein?

Answer 24

Polypeptide chain in extended, long
sheets

Question 25

A ketogenic amino acid is one which degrades to keto-sugars

Answer 25

pyruvate or citric acid cycle intermediates

Question 26

Vitamin K1 was first isolated from alfalfa and has a phytyl side chain consisting of

Answer 26

four isoprene units

Question 27

With an increase in pressure in gaseous phase chemical reactions, the fractional conversion __________ when the number of moles decreases

Answer 27

Increases

Question 28

Who discovered vitamin C (ascorbic acid)?

Answer 28

Albert Szent-Gyorgyi

Question 29

Which of the following characteristic enzymes of gluconeogensis is not found in the cytosol?

Answer 29

Pyruvate carboxlyase