Biology – Sample Short Answer Quiz
Biology – Sample Short Answer Quiz
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Question 1 of 7
1. Question
1 point(s)The table shows the proportions of nucleotide bases in DNA from a variety of organisms.
Explain the significance of these results with respect to the work of James Watson and
Francis Crick in the 1950s. (2 marks)-
This response will be awarded full points automatically, but it can be reviewed and adjusted after submission.
Hint
The results show that the abundance of nitrogenous bases corresponds to specific pairing (A-T, G- C). This implied that the nitrogenous must be associated (bonded) in the DNA structure and verified that DNA is a double helix structure.
(1): specific pairing
(1): DNA structure is a double helix -
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Question 2 of 7
2. Question
1 point(s)Sexually reproductive species are theoretically more likely to survive in a changing
environment due to increased variation in the species, than asexually reproductive species.
Explain how sexual reproduction increases variation. (3 marks)-
This response will be reviewed and graded after submission.
Hint
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Question 3 of 7
3. Question
1 point(s)The diagram below shows chromosomes during cell division.
(i) What is the name of the process occurring in this diagram? (1)
(ii) What is the name of the type of cell division in which it occurs? (1)-
This response will be awarded full points automatically, but it can be reviewed and adjusted after submission.
Hint
(i) Crossing over
(ii) Meiosis -
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Question 4 of 7
4. Question
1 point(s)Students conducted preliminary experiments to analyse the DNA base composition of five different species.
The table shows the experimental data collected.
(a) On the grid provided, plot the % Guanine against % Adenine of the species analysed and draw a suitable line of best fit. (3 marks)
(b) Identify the relationship shown by the data. (1 mark)
(c) Explain the relationship shown by the data. (3 marks)-
This response will be awarded full points automatically, but it can be reviewed and adjusted after submission.
Hint
a)
Sample answer:
b)
Sample answer:
As the % of Adenine increases, the % of Guanine decreases.c)
Sample answer:
The percentage of A = T is related to the percentage of G = C due to the base pairing rule. This means as A goes up, T will also go up because A = T and A + T + C + G should equal
100%. Therefore as A increases, the amount of G should decrease as there is a smaller proportion available. -
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Question 5 of 7
5. Question
1 point(s)Complete the following diagram to show the process by which gametes are formed. (3 marks)
(b) How does the segregation of chromosomes during meiosis lead to a wide variety of gametes being produced? (2 marks)
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This response will be awarded full points automatically, but it can be reviewed and adjusted after submission.
Hint
a)
b)
Sample answer:
In meiosis, there is a reduction division. Chromosome pairs line up together and one of each pair goes into the daughter cells. For each pair, this process is independent – hence a large number of combinations is possible. -
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Question 6 of 7
6. Question
1 point(s)The diagrams below show a pair of homologous chromosomes during cell division.
Figure 1 shows the whole chromosomes and Figure 2 is an enlarged view of the section circled in Figure 1.
(a) Name the type of cell division that would be occurring for this arrangement of chromosomes to be observed. (1 mark)
(b) i. What name is given to the process occurring in the circled area in Figure 1? (1 mark)
ii. What is the outcome of the process you named in part b.i. and what advantage does the result of this process give a species? (2 marks)-
This response will be awarded full points automatically, but it can be reviewed and adjusted after submission.
Hint
(a) Meiosis
(b)i. Crossing over or recombination
ii . Crossing over leads to the reassortment of alleles from parents and this increased variation may lead to increased survival of the species.
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Question 7 of 7
7. Question
1 point(s)Mice have a diploid number of 40.
(a) How many chromosomes are there in each of the following cells? (1 mark)
(b) Briefly state the biological significance of the process of meiosis. (2 marks)
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This response will be awarded full points automatically, but it can be reviewed and adjusted after submission.
Hint
(a) Sperm of a mouse: 20 Fertilised egg of a mouse: 40
b) Two of
- meiosis provides variation in offspring due to (one of): Independent assortment or crossing over and recombination
- fertilisation results in increased variation through joining of gametes
- meiosis ensures gametes are haploid
- increases the chance of a species surviving if there are different selection pressures
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