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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

4.2.8 Development of Drug Testing – Unit exam questions

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  • Questions count: 12
  • Passing grade: B+
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1.
In a population at Hardy-Weinberg equilibrium, the frequency of the recessive allele is 0.3. The frequency of homozygous recessive individuals is
0.49
0.42
0.09
0.3
2.

Gibberellins affect stem growth by

inhibiting elongation
closing stomata
stimulating cell elongation and division, so that plants grow tall
causing leaf fall
3.
IGCSE Biology 1.3 Dna in Classification - Question 9
IGCSE Biology 1.3 Dna in Classification - Question 9
A
B
C
D
4.
The unequal growth of a plant stem, where the shaded side grows faster than the sunlit side, is an example of
The unequal growth of a plant stem, where the shaded side grows faster than the sunlit side, is an example of
gravitropism.
phototropism.
thigmotropism.
photoperiodism.
phototaxis.
5.
In a squirrel population at Hardy-Weinberg equilibrium, black (recessive) is 9 percent. What percentage is homozygous dominant?
In a squirrel population at Hardy-Weinberg equilibrium, black (recessive) is 9 percent. What percentage is homozygous dominant?
21 percent
30 percent
49 percent
70 percent
6.
IGCSE Biology 1.3 Dna in Classification - Question 5
IGCSE Biology 1.3 Dna in Classification - Question 5
A
B
C
D
7.
Which technique is essential in plant tissue culture?
Open-air culture
Sterile (aseptic) technique to prevent microbial contamination
Using unsterilised tools
Adding soil to the medium
8.
IGCSE Biology 1.3 Dna in Classification - Question 3
IGCSE Biology 1.3 Dna in Classification - Question 3
A
B
C
D
9.
Nine percent of an anteater population has a short snout (recessive). At Hardy-Weinberg equilibrium, what is the expected percent heterozygous?
Nine percent of an anteater population has a short snout (recessive). At Hardy-Weinberg equilibrium, what is the expected percent heterozygous?
26.0
30.0
34.0
38.0
42.0
10.
The Hardy-Weinberg principle describes a population in which
mutation rates are high
natural selection is strong
allele frequencies stay constant from generation to generation
migration is frequent
11.
In the stem section, tissue X has lignified dead cells and tissue Y living cells with sieve plates. What are they?
Dr Dabour Hub Academy - figure 1
X phloem; Y xylem
Both xylem
X cuticle; Y stomata
X xylem; Y phloem
12.
Which statement best describes Solvent?
An uneven distribution of charge within a molecule; water has δ− oxygen and δ+ hydrogens.
The energy needed to raise the temperature of 1 kg of a substance by 1 °C; high for water (4.2 kJ kg−1 °C−1).
A liquid in which solutes dissolve; water dissolves polar and charged substances.
A weak attraction between a δ+ hydrogen of one molecule and a δ− atom (such as O) of another.
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Part of Topic 4 · Biodiversity and Natural Resources — see every lesson and quiz in this unit.
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