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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
condensation
B
oxidation
C
denturation
D
hydrolysis
2) What is the function of helicase?
A
It separates DNA strands.
B
It forms bonds between DNA nucleotides.
C
It adds new nucleotides to the DNA helix.
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 hydrogen from the splitting of water
C
Light and hydrogen from the splitting of water
D
ATP and oxygen from the splitting of water
4) What is the composition of the backbone of DNA?
A
A polysaccharide
B
Complementary base pairs
C
Alternating sugar and base molecules
D
Alternating sugar and phosphate molecules
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
480
B
360
C
30
D
40
6) What enzyme removes the RNA primer during replication?
A
Helicase
B
RNA primase
C
DNA polymerase I
D
DNA ligase
7) What is NOT a primary function of protein molecules?
A
Transport
B
Energy Storage
C
Hormones
D
Structure
8) Which substance is a base that is found in DNA?
A
uracil
B
guanine
C
cytokinin
D
adenosine
9) Which two colors of light does chlorophyll absorb MOST?
A
red and green
B
red and blue
C
red and yellow
D
green and blue
10) Which of the following are connected by a hydrogen bond?
A
Two amino acid molecules of a dipeptide
B
Two glucose molecules in a disaccharide
C
A base pair of a DNA molecule
D
The hydrogen and oxygen atoms of a water molecule
*select an answer for all questions
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