Biochem

Question 1

Glucose and fructose are examples of
A. double sugars
B. disaccharides
C. single sugars
D. polysaccharides

Answer 1

C. single sugars

Question 2

(CH2O)n is the molecular formula for which type of
macromolecules?
A. Proteins
B. Lipids
C. Carbohydrates
D. Nucleic Acid

Answer 2

C. Carbohydrates

Question 3

Which of the following is NOT a polysaccharide?
A. Glycogen
B. Starch
C. Sucrose
D. Cellulose

Answer 3

C. Sucrose

Question 4

What are used in animals as a source of quick energy
that can be stored in the liver and muscles ？
A. Proteins
B. Nucleic acids
C. Carbohydrates
D. Lipids

Answer 4

C. Carbohydrates

Question 5

Sugars, starches, and cellulose belong to which major
class of biological molecules?
A. nucleic acids
B. carbohydrates
C. lipids
D. polypep�des

Answer 5

B. carbohydrates

Question 6

Plants like sugar cane and sugar beets store the energy
as simple sugars. Other plants, like corn and potatoes,
store the energy as more complex sugars called?
A. carbohydrates
B. calories
C. starches
D. cellulose

Answer 6

C. starches

Question 7

Which macromolecule does not dissolve in water?
A. proteins
B. lipids
C. carbohydrates
D. nucleic acids

Answer 7

B. lipids

Question 8

Monosaccharides have a yellow appearance and are
soluble in water. True or False?
A. True, they are yellow and soluble in water.
B. False, they are yellow and are insoluble in water.
C. False, they are colorless and are soluble in water.
D. False, they are colorless and insoluble in water.

Answer 8

C. False, they are colorless and are soluble in water.

Question 9

What are the monomers of lipids?
A. Amino acids
B. Simple sugars
C. Faty acids and glycerol
D. Nucleic acids

Answer 9

C. Faty acids and glycerol

Question 10

Lipids are used by the body to perform all of the
following func�ons EXCEPT:
A. membrane structural material.
B. enzyme ac�on.
C. insula�on.
D. a rich energy source.

Answer 10

B. enzyme ac�on.

Question 11

What type of organic substances are fats?
A. nucleic acid
B. carbohydrate
C. protein
D. lipids

Answer 11

lipids

Question 12

Fats that have faty acids with only single covalent
bonds in their carbon skeletons are
A. saturated
B. unsaturated
C. found in plants instead of animals
D. liquid at room temperature

Answer 12

saturated

Question 13

Which has the higher mel�ng point: (a) a triglyceride
containing only lauric acid and glycerol or (b) a
triglyceride containing only stearic acid and glycerol?
A. (a)
B. (b)
C. Both have equal mel�ng points
D. None of the above

Answer 13

B

Question 14

Which of the following is a polymer?
A. nucleic acid
B. faty acid
C. amino acid
D. glycerol

Answer 14

nucleic acid

Question 15

This biological macromolecule is responsible for
controlling the ac�vity of the cell, and it stores and
transports gene�c informa�on.
A. Carbohydrate
B. Nucleic acid
C. Water
D. Glucose

Answer 15

nucleic acid

Question 16

What are described as the “building blocks of Protein”?
A. Fiber
B. Lipids
C. Amino Acids
D. Nutrients

Answer 16

amino acids

Question 17

Proteins are ____ made of amino acid ____.
A. monomers; polymers
B. polymers; polypep�des
C. polymers; monomers
D. monomers; molecules

Answer 17

polymers; monomers

Question 18

In this type of structure, most of carbonyl groups of
pep�de bonds forms a hydrogen bond with the amide
nitrogen of another pep�de bond four amino acids
further down the polypep�de chain:
A. Alpha-helix
B. Beta-sheet
C. Beta-turn
D. Quaternary

Answer 18

alpha-helix

Question 19

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 electroly�c mobility

Answer 19

where the molecule carries no electric charge

Question 20

When the amino acid alanine (R- group is CH3) is added to a solu�on with a pH of 7.3, alanine becomes
A. a ca�on
B. nonpolar
C. a zwiterions
D. an anion

Answer 20

an anion

Question 21

The term “SALTING IN” refers to?
A. Changes in an amino acid’s isoelectric point.
B. Increasing the solubility of a protein in solu�on by
adding ions.
C. The use of a liquid bridge in an electrochemical cell.
D. The ioniza�on of a strong acid.

Answer 21

Increasing the solubility of a protein in solu�on by adding ions.

Question 22

The local spa�al arrangement of a polypep�de’sbackbone atoms without regard to the conforma�on of
its side chains can be called as
A. Primary structure
B. Secondary structure
C. Ter�ary structure
D. Quaternary structure

Answer 22

secondary structure

Question 23

Which of the following amino acids are more likely to
be found in a protein’s interior away from aqueous
solvent molecules?
A. Val, Leu, Ile, Met, and Phe
B. Ser, Thr, Asn, Gln, and Tyr
C. Arg, His, Lys, Asp, and Glu
D. All of the above.

Answer 23

A. Val, Leu, Ile, Met, and Phe

Question 24

Which of the following is (are) true of 𝛽𝛽 - turns in
proteins?
A. It is a 180º turn of four amino acids.
B. Glycine and proline are frequently found there.
C. Are used as connec�n
D. All of the wbove

Answer 24

D. All of the above

Question 25

The primary stabilizing force of protein secondary
structure is:
A. Ionic bonds.
B. Covalent bonds.
C. Van der Waals forces.
D. Hydrogen bonds

Answer 25

Hydrogen bonds

Question 26

Two types of 𝛽𝛽-pleated sheets can be called:
A. parallel and an�parallel
B. le�-handed and right-handed.
C. Φ and Ψ
D. a and B

Answer 26

A. parallel and antiparallel

Question 27

Which of the following is NOT a characteris�c of a
globular protein?
A. Polypep�de chain in extended, long sheets
B. Polypep�de chains are folded in a spherical shape
C. Contains several types of secondary structure
D. Typical for regulatory proteins

Answer 27

Polypep�de chain in extended, long sheets