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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

2.3.8 The Role of Enzymes – Unit exam questions

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  • Questions count: 16
  • Passing grade: B+
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1.
IGCSE Biology 3.2 Osmosis - Question 3
IGCSE Biology 3.2 Osmosis - Question 3
A
B
C
D
2.
Which statement best describes Cell theory?
The ability to distinguish two points that are close together as separate.
A small circular loop of DNA found in many prokaryotes, separate from the main chromosome.
The principle that all living things are made of cells, cells are the basic unit of life, and new cells come from pre-existing cells.
How many times larger an image is than the real object.
3.

B1.1 Carbohydrates and lipids — Question 8 | DABOUR HUB

Dr Dabour Hub Academy - figure 1
A
B
C
D
4.
Which statement best describes Universal genetic code?
Which statement best describes Universal genetic code?
Last universal common ancestor.
All life descends from shared ancestors.
Feature shared by a group from their ancestor.
Shared by almost all organisms.
5.
Which pairing of property and example is correct?
Cohesion — ice floating
Adhesion — sweating
Surface tension — dissolving salt
High specific heat — oceans moderating coastal climate
6.
According to the comparison table in this lesson, what is the Level of Universal genetic code?
According to the comparison table in this lesson, what is the Level of Universal genetic code?
Evidence of common ancestry
Cellular
Genetic
Metabolic
Molecular
7.
An image is 30 mm; the object is 6 μm. The magnification is
×50
×500
×50 000
×5000
8.
fMRI detects brain activity by measuring:
X-ray absorption
Electrical impulses directly
Increased flow of oxygenated blood
Radioactive glucose only
9.
Which feature distinguishes active transport from facilitated diffusion?
It uses membrane proteins
It moves substances against a concentration gradient
It moves only water
It needs no energy
10.
Which statement correctly describes sperm cell?
a specialised plant cell adapted for absorption
a specialised cell that carries electrical impulses
a specialised animal cell adapted for fertilisation
a cell whose cilia move mucus
11.
IGCSE Biology 1.3 Dna in Classification - Question 9
IGCSE Biology 1.3 Dna in Classification - Question 9
A
B
C
D
12.

The progress of an enzyme-catalysed reaction can be followed by measuring

the rate of formation of product or disappearance of substrate
the mass of enzyme
the colour of the enzyme
the pH only
13.

Enzymes are

fibrous proteins
lipids
carbohydrates
globular proteins that catalyse metabolic reactions
14.

Enzymes speed up reactions by

lowering the activation energy
raising the activation energy
increasing the temperature
being used up
15.

An extracellular enzyme is one that

works in the nucleus
is never released
is a lipid
is secreted and acts outside the cell
16.

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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