This document is a revision quiz for a biology unit on cellular control and variation. It contains 50 multiple choice questions testing knowledge of topics like DNA, genes, protein synthesis, mutations, meiosis, inheritance patterns, variation within populations, and artificial selection. The questions cover terminology, processes, and concepts from genetics and evolution.

1. A2 OCR Biology
UNIT 2 – Module 1
Cellular Control and Variation
Revision Quiz
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2. 1. What are the names of the four bases in DNA? (1)
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2. Which two of these bases are pyrimidines? (1)
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3. How many hydrogen bonds are there between a G and C base
pair? (1)
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4. Define the term gene. (1)
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5. What is the name for the strand of DNA that is used as the code
for making proteins? (1)
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6. Name the two stages of protein synthesis. (2)
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7. What is the name of the enzyme that breaks hydrogen bonds
between the bases to unzip the DNA? (1)
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8. Which enzyme catalyses the condensation reactions between
the RNA nucleotides as they form? (1)
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9. Write out the mRNA sequence for the following DNA sequence:
ATGGCATGCAAGCGG (2)
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3. 10.
What do you call each group of 3 bases on the mRNA
molecule? (1)
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11.
Which molecule can bind to an amino acid and take it to a
ribosome in order for it be assembled into a protein? (1)
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12.
What type of bond is formed between the amino acids to
turn it into a protein? (1)
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13.
Define the term mutation (1)
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14.
Name the two types of base mutation that can cause a
‘frame shift’ in how the genetic code is read. (2)
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15.
What type of mutation causes sickle cell anaemia? (1)
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16.
In sickle cell ameamia the amino acid glutamate is
replaced by which amino acid? (1)
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17.
What molecule does this affect the shape of in the red
blood cells? (1)
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18.
Name the two enzymes needed for the digestion and
absorption of lactose by E-coli(2)
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4. 19.
Label the following diagram of the lac operon (3)
20.
What protein does the regulator gene code for? (1)
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21.
Which set of genes determine an organism’s body plan? (1)
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22. What is the name of the proteins that these genes code for?
(1)
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23. What is the biological term for programmed cell death? (1)
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24. What type of cell division is used to produce gametes? (1)
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25.
What is the new cell called that is formed when an egg
and a sperm fuse? (1)
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26.
What word describes a cell with two sets of
chromosomes? (1)
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5. 27.
How many divisions are there in meiosis? (1)
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28.
At what stage of meiosis do the chromosomes line up in
their homologous pairs along the equator? (1)
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29.
What stage of meiosis does crossing over occur at? (1)
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30.
What word is used to describe the place a gene is located
on a chromosome? (1)
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31.
What word describes what the chromosomes form when
they are crossed over? (1)
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32.
What term is used to describe how bivalents can align
along the equator in various combinations? (1)
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33.
If two heterozygous individuals for cystic fibrosis have
children, what percentage of them will suffer from the disease?
(1)
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34.
What does p2 represent in the Hardy-Weinberg
equation? (1)
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35.
What are the three possible alleles for blood group? (1)
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6. 36.
If you were blood group AB what genotype would you
have? (1)
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37.
What term is used to describe when both alleles have an
effect on the phenotype? (1)
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38.
What term is used to describe the fact that the X and Y
chromosome are different? (1)
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39.
Give two examples of genetic conditions that are sex
linked? (2)
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40.
In dihybridinheritance, what would be the ratio of
phenotypes, if parents are both heterozygous for the two
genes? (1)
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41.
What term is used to explain the fact that two genes on
the same chromosome tend to be inherited together? (1)
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42.
What is it called when one gene affects the expression of
another quite separate gene? (1)
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43.
What are the two ways of classifying variation? (2)
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7. 44.
Which one of these is controlled by multiple genes
(Polygenic) (1)
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45.
What term is used to describe all the available alleles in a
population? (1)
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46.
What type of selection occurs when an environment
remains stable? (1)
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47.
What are the three different isolating mechanisms that
occur in sympatric speciation? (3)
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48.
What are the names of the two different species
concepts? (2)
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49.
Give two characteristics you would artificially select
cows for? (2)
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50.
Give two ways that you can maximize breeding success in
artificial selection? (2)
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END OF TEST