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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)

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9. Exam Guidance and Skills

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Quiz

1.5.8 The Watson Crick Model – Exam questions

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  • Questions count: 13
  • Passing grade: B+
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1.
The fluid mosaic model describes the membrane as
a phospholipid bilayer with proteins that can move laterally
a rigid protein sheet
a layer of cellulose
a single layer of lipids
2.
Which of the following best describes the fluid mosaic model of membranes?
Which of the following best describes the fluid mosaic model of membranes?
Phospholipid bilayer with proteins of various lengths and sizes on the exterior portions of the membrane
Phospholipid bilayer with proteins of various lengths and sizes in the interior of the membrane
Phospholipid bilayer with proteins of uniform lengths and sizes in the interior of the membrane
Phospholipid bilayer with proteins of various lengths and sizes interspersed among the phospholipids
Phospholipid bilayer with proteins of uniform length and size interspersed among the phospholipids
3.
In the agar model, what does the dye represent?
DNA
The cell membrane
The nucleus
A substance diffusing into a cell
4.
Students model meiosis with pipe cleaners. What do two pipe cleaners of the same length but different colours represent?
A homologous pair — one maternal, one paternal
Two sister chromatids
Two gametes
Two nuclei
5.
In the pipe-cleaner model, students forget to twist beads between colours. Which process is missing from their model?
Crossing over
DNA replication
Cytokinesis
Fertilisation
6.
Meselson–Stahl results (heavy ¹⁵N DNA moved to ¹⁴N) are shown. Which model does generation 1 support?
Conservative replication
No replication
Semiconservative replication
Replication creating only heavy DNA
7.
The diagram shows two replication models. Which model is semiconservative?
Dr Dabour Hub Academy - figure 1
Model 1
Model 2
Both models
Neither model
8.
Which pairing of Meselson–Stahl result and model is correct?
Heavy and light bands — semiconservative
All intermediate after one generation — semiconservative
All heavy — semiconservative
All intermediate — conservative
9.
Students model half-life by shaking coins and removing heads each round. What does each round represent?
One half-life
One year exactly
One fossil
One rock layer
10.
In the coin model, 20 coins give irregular results. How can the model be improved?
Use fewer coins
Use many more coins so the halving pattern is clearer
Remove tails instead
Stop after one round
11.
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
12.
Complete the statement: The membrane model is the ______.
Complete the statement: The membrane model is the ______.
glycoproteins
Plasma membrane
fluid mosaic
Cholesterol
13.
In the agar cube model, cube size is the _____.
dependent variable
histone
independent variable
constant
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Part of 1. Biological Molecules — see every lesson and quiz in this unit.
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