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Course: AQA A Level Biology 7402
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AQA A Level Biology 7402

1. Biological Molecules

0/102

2. Cell Structure

0/95

3. Exchange and Transport

0/98

4. Genetics, Variation and Interdependence

0/94

5. Energy Transfers In and Between Organisms (A Level only)

0/63

6. Organisms Respond to Changes in their Environments (A Level only)

0/93

7. Genetics, Populations, Evolution and Ecosystems (A Level only)

0/55

8. The Control of Gene Expression (A Level only)

0/72

9. Exam Guidance and Skills

0/38
Quiz

8.2.8 Epigenetics and Disease – Unit exam questions

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  • Questions count: 12
  • Passing grade: B+
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1.
Which of the following will result in a quicker rate of DNA migration on an electrophoresis gel?
Which of the following will result in a quicker rate of DNA migration on an electrophoresis gel?
Increase in temperature of the gel
Increase in amount of DNA added to the well
Reversal of charge of the gel
Increase in current flowing through the gel
Increase in the length of time the current is run
2.
The table shows the restriction enzyme recognition sites present on a circular piece of DNA 4.0 kilobases (1 kb = 1,000 bases) long.
SAT Biology - Question 281
A
B
C
D
E
3.

An ethical concern about genetic screening of embryos is

that it cures all diseases
the possibility of selecting embryos for non-medical characteristics
that it is always inaccurate
that it increases mutation
4.
Which hypothesis could be tested using gel electrophoresis?
Fragments from enzyme A digestion will be smaller than those from enzyme B
Gels are clear
DNA is a molecule
Enzymes exist
5.
In Sanger sequencing, what stops chain elongation?
Restriction enzymes
Primers
Incorporation of a dideoxynucleotide
High temperature
6.
According to the comparison table in this lesson, what is the Key steps of Sequencing?
According to the comparison table in this lesson, what is the Key steps of Sequencing?
Biotechnology techniques
95 °C denature, 55 °C anneal, 72 °C extend
Load, run current, stain
Dideoxy / next-gen
Guide RNA targets DNA
7.
Which of the following is not a way to form recombinant DNA?
Which of the following is not a way to form recombinant DNA?
Translation
Conjugation
Specialized transduction
Transformation
8.
Which statement best describes Short tandem repeat (STR)?
A short DNA sequence repeated many times in a row; the number of repeats varies between people.
A short single-stranded DNA sequence complementary to the start of the target region, providing a start point for DNA polymerase.
Comparing the pattern of variable DNA regions (e.g. short tandem repeats) between individuals.
A technique that makes many copies of a specific DNA sequence by repeated cycles of heating and cooling.
9.
Which statement best describes Mutation?
A permanent change in the DNA sequence.
The three-base sequence on a tRNA that pairs with a complementary mRNA codon.
Synthesis of an RNA copy of a gene by RNA polymerase, using DNA as a template.
A non-coding sequence within a eukaryotic gene that is removed from pre-mRNA by splicing.
10.
According to the comparison table in this lesson, what is the Mechanism of Mutation?
According to the comparison table in this lesson, what is the Mechanism of Mutation?
Sources of genetic variation
DNA change
Random orientation
Segments exchanged
Any gamete pair
11.
In gel electrophoresis, why is a DNA ladder run alongside samples?
To add charge
To cut the DNA
To estimate fragment sizes by comparison
To copy DNA
12.
Restriction enzymes cut DNA and DNA ligase joins it. True or false?
True
False
False, the reverse
True only in PCR
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Part of 8. The Control of Gene Expression (A Level only) — see every lesson and quiz in this unit.
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