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Course: Edexcel A Level Biology A (SNAB) 9BI0
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Edexcel A Level Biology A (SNAB) 9BI0

Topic 1 · Lifestyle, Health and Risk

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Topic 2 · Genes and Health

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Topic 3 · Voice of the Genome

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Topic 4 · Biodiversity and Natural Resources

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Topic 5 · On the Wild Side

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Topic 6 · Immunity, Infection and Forensics

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Topic 7 · Run for your Life

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Topic 8 · Grey Matter

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Quiz

2.4.4 Pedigree Diagrams – Unit exam questions

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  • Questions count: 12
  • Passing grade: B+
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1.
Which statement best describes Genetic code?
The synthesis of mRNA from a DNA template in the nucleus, catalysed by RNA polymerase.
The rules by which base triplets in mRNA specify amino acids.
The three bases on a tRNA molecule complementary to an mRNA codon.
A change in the base sequence of DNA, such as a substitution, insertion or deletion.
2.
Rate at different substrate concentrations is shown. Why does the rate level off above 4%?
The enzyme has denatured
The substrate has become the enzyme
All active sites are occupied — the enzyme is saturated
Temperature has fallen
3.
RNA polymerase binds first to the
terminator
start codon
promoter
ribosome
4.
Which statement best describes RNA polymerase?
Which statement best describes RNA polymerase?
Different exon combinations → different proteins.
Coding region kept.
Builds RNA 5′→3′ from a template strand.
Protect mRNA and help export.
5.

The chi-squared test is used in genetics to

test whether observed and expected ratios differ significantly
calculate allele frequency
find the mean
measure variation
6.
IGCSE Biology 17.2 Protein Synthesis - Question 22
IGCSE Biology 17.2 Protein Synthesis - Question 22
A
B
C
D
7.
IGCSE Biology 17.2 Protein Synthesis - Question 8
IGCSE Biology 17.2 Protein Synthesis - Question 8
A
B
C
D
8.

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
9.
Which of the following is an improper pairing of DNA or RNA nucleotides?
Which of the following is an improper pairing of DNA or RNA nucleotides?
Thymine-adenine
Guanine-thymine
Uracil-adenine
Guanine-cytosine
Pyrimidine-purine
10.

An enzyme–substrate complex is

the product of the reaction
an inhibitor
a coenzyme
the temporary structure formed when a substrate binds to the active site
11.
IGCSE Biology 18.2 Mutation - Question 6
IGCSE Biology 18.2 Mutation - Question 6
A
B
C
D
12.

Catalase catalyses the breakdown of

starch to maltose
protein to amino acids
hydrogen peroxide to water and oxygen
lipids to fatty acids
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Part of Topic 2 · Genes and Health — see every lesson and quiz in this unit.
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