Biochemistry (SL & HL): Question Preview (ID: 9390)

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Which of the following reactions occurs when a dipeptide is formed from amino acids?
a) hydrolysis
b) oxidation
c) condensation
d) denturation

What is the function of helicase?
a) It forms bonds between DNA nucleotides.
b) It separates DNA strands.
c) It forms the DNA helix.
d) It adds new nucleotides to the DNA helix.

What is needed in photosynthesis to convert CO2 into organic molecules?
a) Light and hydrogen from the splitting of water
b) Light and oxygen from the splitting of water
c) ATP and hydrogen from the splitting of water
d) ATP and oxygen from the splitting of water

What is the composition of the backbone of DNA?
a) Alternating sugar and phosphate molecules
b) A polysaccharide
c) Alternating sugar and base molecules
d) Complementary base pairs

A certain gene codes for a polypeptide that is 120 amino acids long. Approximately how many nucleotides long is the mRNA that codes for this polypeptide likely to be?
a) 30
b) 480
c) 360
d) 40

What enzyme removes the RNA primer during replication?
a) RNA primase
b) Helicase
c) DNA ligase
d) DNA polymerase I

What is NOT a primary function of protein molecules?
a) Hormones
b) Structure
c) Transport
d) Energy Storage

Which substance is a base that is found in DNA?
a) adenosine
b) cytokinin
c) guanine
d) uracil

Which two colors of light does chlorophyll absorb MOST?
a) red and yellow
b) red and blue
c) red and green
d) green and blue

Which of the following are connected by a hydrogen bond?
a) The hydrogen and oxygen atoms of a water molecule
b) Two glucose molecules in a disaccharide
c) Two amino acid molecules of a dipeptide
d) A base pair of a DNA molecule

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