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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

1.4.9 Limiting Factors Affecting Enzymes- Enzyme Concentration – Unit exam questions

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  • Questions count: 12
  • Passing grade: B+
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1.
Why does a high temperature denature enzymes?
Peptide bonds are hydrolysed
Hydrogen and ionic bonds break, changing the active site
Substrate becomes too fast to bind
The enzyme evaporates
2.
What is the rate of reaction for the enzyme-substrate interaction shown in the graph below? (see the figure)
What is the rate of reaction for the enzyme-substrate interaction shown in the graph below? (see the figure)
6 micromoles per minute
5 micromoles per minute
4 micromoles per minute
3 micromoles per minute
2 micromoles per minute
3.

A competitive inhibitor

binds elsewhere
increases the rate
denatures the enzyme
binds to the active site and competes with the substrate
4.
Which of the following molecules can give rise to the most ATP?
Which of the following molecules can give rise to the most ATP?
NADH
FADH2
Pyruvate
Glucose
5.
The coupling of electron movement down the electron transport chain with ATP formation using the driving force of the proton gradient.
The coupling of electron movement down the electron transport chain with ATP formation using the driving force of the proton gradient.
Glycolysis
Krebs cycle
Oxidative phosphorylation
Chemiosmosis
Fermentation
6.
Which step comes first in the sequence covered in this lesson?
Which step comes first in the sequence covered in this lesson?
Double helix
Chromosome
Nucleotides
Base pairing A–T, C–G
7.
IGCSE Biology 1.3 Dna in Classification - Question 1
IGCSE Biology 1.3 Dna in Classification - Question 1
A
B
C
D
8.
A student answered the question "The DNA template strand is 3'-TAC GGA-5'. What is the mRNA sequence?" as follows. In which step is the error? Step 1: Identify complementary bases: A pairs with T, and G pairs with C. Step 2: Write the mRNA: 5'-AUG CCT-3'. Step 3: Check that the first codon is AUG, the start codon. Step 4: Note that translation takes place on the ribosome.
Step 1
Step 2
Step 3
Step 4
9.
Which statement best describes 70S ribosomes?
Which statement best describes 70S ribosomes?
Evidence of engulfment.
Organelles divide like bacteria.
Mitochondria and chloroplasts came from engulfed prokaryotes.
Prokaryote-type ribosomes in organelles.
10.
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
11.
Enzyme and substrate fit together like:
A lock and key
A circle and a square
Oil and water
Two magnets
12.

A noncompetitive inhibitor

binds to the active site
binds to a site other than the active site and changes the enzyme’s shape
is the substrate
has no effect
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Part of 1. Biological Molecules — see every lesson and quiz in this unit.
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