Biochem Flashcards
Glucose and fructose are examples of
A. double sugars
B. disaccharides
C. single sugars
D. polysaccharides
C. single sugars
(CH2O)n is the molecular formula for which type of
macromolecules?
A. Proteins
B. Lipids
C. Carbohydrates
D. Nucleic Acid
C. Carbohydrates
Which of the following is NOT a polysaccharide?
A. Glycogen
B. Starch
C. Sucrose
D. Cellulose
C. Sucrose
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
C. Carbohydrates
Sugars, starches, and cellulose belong to which major
class of biological molecules?
A. nucleic acids
B. carbohydrates
C. lipids
D. polypep�des
B. carbohydrates
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
C. starches
Which macromolecule does not dissolve in water?
A. proteins
B. lipids
C. carbohydrates
D. nucleic acids
B. lipids
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.
C. False, they are colorless and are soluble in water.
What are the monomers of lipids?
A. Amino acids
B. Simple sugars
C. Faty acids and glycerol
D. Nucleic acids
C. Faty acids and glycerol
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.
B. enzyme ac�on.
What type of organic substances are fats?
A. nucleic acid
B. carbohydrate
C. protein
D. lipids
lipids
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
saturated
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
B
Which of the following is a polymer?
A. nucleic acid
B. faty acid
C. amino acid
D. glycerol
nucleic acid
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
nucleic acid
What are described as the “building blocks of Protein”?
A. Fiber
B. Lipids
C. Amino Acids
D. Nutrients
amino acids
Proteins are ____ made of amino acid ____.
A. monomers; polymers
B. polymers; polypep�des
C. polymers; monomers
D. monomers; molecules
polymers; monomers
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
alpha-helix
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
where the molecule carries no electric charge
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
an anion
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.
Increasing the solubility of a protein in solu�on by adding ions.
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
secondary structure
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.
A. Val, Leu, Ile, Met, and Phe
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
D. All of the above
The primary stabilizing force of protein secondary
structure is:
A. Ionic bonds.
B. Covalent bonds.
C. Van der Waals forces.
D. Hydrogen bonds
Hydrogen bonds
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
A. parallel and antiparallel
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
Polypep�de chain in extended, long sheets
