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AQA A Level Biology Paper One Revision Questions And Answers
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10/23/24, 9:57 AMAQA A Level Biology Paper One Revision Questions And
Answers
Terms in this set (119)
What's the type of bond between glycerol Ester bonds
and a fatty acid in a phospholipid?
If it contained a double bond between adjacent carbon atoms in the hydrocarbon
How would a fatty acid be unsaturated?
chain.
Suggest one advantage of the different Red blood cells would be free in blood, and not supported by other cells which
percentage of cholesterol in red blood ensures that cholesterol will maintain its shape.
cells compared with cells lining the ileum.
E. coli has no cholesterol in its cell-surface - Cells are unable to change shape due to the cell having a cell wall.
membrane. Despite this, the cell maintains a - This makes the cell rigid since it is made of murein.
constant shape. Explain why.
- Starch formed w a glucose, Cellulose w b glucose
Explain the difference between starch
molecules and cellulose molecules
- Position of hydrogen and hydroxyl groups on carbon atom 1 are inverted.
How is starch adapted for its role? - Insoluble, meaning that it doesn't affect water potential.
- Long and straight chains
How is cellulose adapted for it's function in
-Become linked together with hydrogen bonds which form fibrils
plant cells?
- Provides strength for cell wall.
DNA helicase breaks down hydrogen bonds
- One DNA strands acts as a tempalte
How is mRNA produced in the nucleus of a - RNA nucleotides exposed to bases
cell? - Attraction linked to the base pairing rule
- RNA Polymerase joins RNA nucleotides together
- Pre-mRNA spliced to remove introns.
- Polymer of amino acids;
Describe the structure of proteins - Joined by peptide bonds;
- Formed by condensation;
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hydrolysis of peptide bonds occur so:
Describe how proteins are digested in the
endo - break polypeptides to smaller peptide chains
human gut?
exo - remove terminal amino acids
di - hydrolyze dipeptides to amino acids
What reducing sugar, or sugars, would you Maltose, since amylase is produced during chewing.
expect to be produced during chewing?
Give a reason for your answer.
- both are polymers
how is starch similar to cellulose? - both contain glucose
- have 1,4 links
What organ produces amylase and pancreas
maltose?
Active site of enzyme has complementary shape to substrate maltose
Why is maltose only hydrolyzed by
maltase?
Only maltose can bind, forming an enzyme substrate complex.
How do you identify is DNA is single If it does not have the same amount of A and T
stranded? or G and C
DNA Polymerase joins nucleotides to form new strand DNA
Prokaryotic Cell differences to Eukaryotic - Circular
Cells - No introns
They have different genes
Why are Humans and X genetically similar,
triplets are in different places
but different
so different amino acids code for different proteins
For more light to pass through
Cutting x thin for optical microscope
so a single cell can be viewed
DNA has antiparallel strands
Shape of nucleotides is aligned differently
Enzymes with specific shapes have active
sites
ONLY substrates with specific shapes can
bind with active site
The outside of a virus has proteins, with complementary shapes to the receptor
How can nerve cells be affected by a
virus?
Receptor only found on membrane of nerve cells.
Prevents the replication of viruses.
Advantage of programmed cell death
Prevents replications of mutations/mutations of a cell
How is DNA a polymer? It has repeating units
releases small amount of energy
Two ways ATP is a suitable energy source
AQA A Level Biology Paper One Revision
instant energy release
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