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Biochemistry
Biochemistry Tricky
Quiz 1
Solution
Q.1.
Which of the following is a hypertonic solution?
a) Oceans
b) Freshwater habitats
c) 0.45% sodium chloride
d) Red blood cells placed in fresh water
Q.2.
If pH of solution of NaOH is 12.0 the pH of H2SO4 solution of same molarity will be ____________
a) 2.0
b) 12.0
c) 1.7
d) 10.0387
Q.3.
NaCl andHCl are present in an aqueous solution. What is the solution?
a) Not a buffer solution with pH < 7
b) Not a buffer solution with pH > 7
c) A buffer solution with pH < 7
d) A buffer solution with pH > 7
Q.4.
What does it mean when we say that water acts as a “heat buffer”?
a) It keeps the temperature of an organism relatively constant as the temperature of the surroundings fluctuates
b) It increases the temperature of an organism as the temperature of the surroundings increases
c) It decreases the temperature of an organism as the temperature of the surroundings increases
d) It increases the temperature of an organism as the temperature of the surroundings decreases
Q.5.
What trend does the reactivity of group II elements follow with water?
a) Increases down the group
b) Decreases down the group
c) Does not follow any particular trend
d) No reaction
Q.6.
Which of the following is not the classified form of conjugated proteins?
a) Lipoproteins
b) Glycoproteins
c) Metalloproteins
d) Complete proteins
Q.7.
Tertiary conformation of proteins is maintained by 3 types of bonds namely ionic, hydrogen and ____________
a) Sulfide
b) Disulfide
c) Covalent
d) Peptide
Q.8.
Which of the following is true?
a) The disulfide bridges formed by reduction of the sulfhydryl groups on cysteine stabilizes protein tertiary structure
b) The disulfide bridges formed by oxidation of the sulfhydryl groups on cysteine destabilize protein tertiary structure
c) The disulfide bridges formed by oxidation of the sulfhydryl groups on cysteine stabilizes protein tertiary structure
d) The disulfide bridges formed by reduction of the sulfhydryl groups on cysteine destabilize protein tertiary structure
Q.9.
Instructure of proteins, folding and shaping is done by ____________
a) Hydrophobic interactions
b) Polar interactions
c) Hydrogen bonding
d) None of the mentioned
Q.10.
Which of the following does not affect the stability of an α-helix?
a) Electrostatic repulsion
b) Bulkiness
c) Interaction between R groups spaced three residues apart
d) Occurrence of alanine and glycine residues
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