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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

6.1.2 Micro-organisms- Decomposition and Nutrient Recycling – Unit exam questions

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  • Questions count: 12
  • Passing grade: B+
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1.
In negative feedback, the response produced by the system
has no effect on the stimulus
amplifies the original change
permanently resets the stimulus
opposes the original change and restores the set point
2.
IGCSE Biology 15.2 Antibiotic resistance - Question 3
IGCSE Biology 15.2 Antibiotic resistance - Question 3
A
B
C
D
3.
A drug blocks the enzyme that breaks down a second messenger. The immediate effect inside the target cell is that the response
is unchanged
becomes weaker
stops at once
lasts longer than normal
4.
Which organ is responsible for the maturation of immune system cells?
SAT Biology - Question 008
A
B
C
D
E
5.
Which statement best explains why a signal transduction pathway can produce different responses in two cell types?
The ligand changes shape between tissues
The receptor binds a different ligand in each
The two cell types express different sets of intracellular proteins
Only one cell type has a plasma membrane
6.
Which statement best describes Antibiotic?
Protection of unvaccinated individuals when a high proportion of a population is immune, limiting transmission.
A lymphocyte that kills infected body cells, e.g. using perforin to make pores in their membranes.
A lymphocyte that is activated by an APC and releases cytokines to activate B cells, cytotoxic T cells and macrophages.
A substance, often produced by microorganisms, that kills or inhibits the growth of bacteria.
7.

In a rod cell in the dark

sodium channels are closed
the cell is hyperpolarised
sodium ions flow in through open channels and the cell is depolarised, releasing glutamate
rhodopsin is bleached
8.
IGCSE Biology 15.2 Antibiotic resistance - Question 9
IGCSE Biology 15.2 Antibiotic resistance - Question 9
A
B
C
D
9.
Which method best tests whether hand washing reduces bacteria?
Look at hands
Test one plate only
Wash without soap and never test
Press fingers on agar before and after washing and compare colony counts, with repeats
10.
Bacteria reproduce by _____.
the lytic cycle
binary fission
mitosis
meiosis
11.
Antibiotics are effective against viruses. True or false?
True
True for colds
True for flu
False
12.
Viruses have no metabolism of their own. True or false?
True
False
False, they respire
True only outside cells
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Part of Topic 6 · Immunity, Infection and Forensics — see every lesson and quiz in this unit.
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