
The genetic code | Starter Quiz | Oak National Academy
Authored by Oak National Academy
Biology
9th Grade

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6 questions
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1.
REORDER QUESTION
1 min • 1 pt
Starting with the largest, put the structures in order of decreasing size.
cell
chromosome
nucleus
genome
gene
Answer explanation
This is the correct order of size for eukaryotic cells (animal, plant and fungal cells). Prokaryotic (e.g. bacterial cells) do not have a nucleus and have one chromosome made of a single DNA molecule.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does the order of nucleotide bases in a gene determine?
the structure of a carbohydrate molecule
the structure of a fat molecule
the structure of the nucleus
the structure of a protein molecule
Answer explanation
A gene carries the instructions to build a protein.
3.
FILL IN THE BLANK QUESTION
1 min • 1 pt
What is the name of the type of molecule that acts as a catalyst in living organisms?
Answer explanation
Without enzymes, chemical reactions would be too slow to sustain life.
4.
FILL IN THE BLANK QUESTION
1 min • 1 pt
The diagram shows a single nucleotide. Which part of the nucleotide joins the two strands of a DNA molecule together?
Answer explanation
Bases pair up across the two nucleic acid strands to form the ‘rungs’ of the DNA ‘ladder’.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
One strand of a DNA molecule has the base sequence A A T C G A G C A. Which is the complementary base sequence on the other strand of the DNA molecule?
A A T C G A G C A
A C G A G C T A A
T T A G C T C G T
C C G A T C T A G
Answer explanation
The complementary base sequence on the other strand of the DNA molecule is T T A G C T C G T.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The photograph shows a model of DNA made from jelly babies and liquorice sticks. In this model, which parts of the nucleotide molecules are represented by the liquorice sticks?
Bases only
Sugars only
Bases and sugars
Bases and phosphates
Sugars and phosphates
Answer explanation
The liquorice sticks represent the sugar and phosphate of each nucleotide, which form a long ‘backbone’ of alternating sugar and phosphate units.
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