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Biochemistry (SL & HL)
Test Description: Review questions for topic 3 (The chemistry of life) from the IB Biology syllabus.
Instructions: Answer all questions to get your test result.
1) Which of the following reactions occurs when a dipeptide is formed from amino acids?
A
denturation
B
condensation
C
hydrolysis
D
oxidation
2) What is the function of helicase?
A
It separates DNA strands.
B
It adds new nucleotides to the DNA helix.
C
It forms bonds between DNA nucleotides.
D
It forms the DNA helix.
3) What is needed in photosynthesis to convert CO2 into organic molecules?
A
Light and oxygen from the splitting of water
B
ATP and oxygen from the splitting of water
C
Light and hydrogen from the splitting of water
D
ATP and hydrogen from the splitting of water
4) What is the composition of the backbone of DNA?
A
Alternating sugar and base molecules
B
Complementary base pairs
C
Alternating sugar and phosphate molecules
D
A polysaccharide
5) 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
40
B
360
C
480
D
30
6) What enzyme removes the RNA primer during replication?
A
RNA primase
B
DNA ligase
C
Helicase
D
DNA polymerase I
7) What is NOT a primary function of protein molecules?
A
Transport
B
Structure
C
Hormones
D
Energy Storage
8) Which substance is a base that is found in DNA?
A
uracil
B
cytokinin
C
guanine
D
adenosine
9) Which two colors of light does chlorophyll absorb MOST?
A
red and blue
B
green and blue
C
red and yellow
D
red and green
10) Which of the following are connected by a hydrogen bond?
A
A base pair of a DNA molecule
B
Two amino acid molecules of a dipeptide
C
Two glucose molecules in a disaccharide
D
The hydrogen and oxygen atoms of a water molecule
*select an answer for all questions
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