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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

8.2.4 Producing Tissue Cultures of Explants – Unit exam questions

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  • Questions count: 12
  • Passing grade: B+
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1.
A restriction enzyme cuts at GAATTC. How many times will it cut the sequence in the table?
Once
Three times
Twice
Not at all
2.
Which best defines epigenetics?
Changes in DNA base sequence
Mutations in gametes
Protein folding
Heritable changes in gene expression without changes to base sequence
3.
A mutation changed a polar amino acid into a nonpolar one far from the active site. How might this alter the enzyme\'s substrate specificity?
A mutation changed a polar amino acid into a nonpolar one far from the active site. How might this alter the enzyme's substrate specificity?
By changing the enzyme pH optimum
By changing the enzyme location in the cell
By changing the shape of the protein
An amino acid change away from the active site cannot alter substrate specificity.
4.
The following change is an example of which type of mutation? Original DNA sequence: ATGGA–AGC New DNA sequence: ATTGACAGC
SAT Biology - Question 122
A
B
C
D
E
5.
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
6.
Which statement best describes Recombinant DNA?
Separating DNA fragments by size using an electric field.
A small circular DNA loop in bacteria, used as a vector to carry a gene.
DNA combining sequences from more than one source.
Directly changing an organism's DNA, often by inserting a gene from another species.
7.
Which genetic mutation occurred farthest back in time?
SAT Biology - Question 300
A
B
C
D
E
8.

Recombinant DNA is

DNA copied by PCR
single-stranded DNA
DNA formed by joining pieces from two or more different sources
mutated DNA
9.
Which statement best describes Dideoxynucleotide?
A short single-stranded DNA sequence complementary to the start of the target region, providing a start point for DNA polymerase.
A technique that makes many copies of a specific DNA sequence by repeated cycles of heating and cooling.
A heat-stable DNA polymerase from the bacterium Thermus aquaticus, used in PCR.
A modified nucleotide lacking the 3' OH group, which terminates DNA synthesis when added.
10.
The cultures were kept at different temperatures. Why is this a problem?
Temperature is dependent
It improves the experiment
It has no effect on cells
Temperature also affects division, so it confounds the result
11.
Cells were grown in a dish. Which culture shows loss of contact inhibition?
Culture X
Both cultures
Neither culture
Culture Y
12.
Which enzyme joins the sugar-phosphate backbones of DNA fragments?
Restriction endonuclease
DNA polymerase
Reverse transcriptase
DNA ligase
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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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