AQA Biology A2 Unit 5 Quiz

A quiz testing most (maybe more to come) areas of the unit 5 specification.

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  • Created by: Josh
  • Created on: 03-05-13 18:07
A response whose randomness elevates alongside increasingly unfavourable conditions is a ___?
Kinesis
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The chemical responsible for positive phototropism in plant shoots is ___?
Indoleacetic Acid
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How does the chemical from question 2 affect tissues in the ROOT?
It inhibits elongation
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Heart rate is controlled by what region of the brain?
Medulla oblongata
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The chemo- and pressure receptors responsible for keeping the heart rate in check are found where?
In the carotid arteries
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The channels responsible for inducing a generator potential in the pacinian corpuscle are known as what?
Stretch-mediated sodium ion channels
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In myelinated neurons, depolarisation can only occur where?
Nodes of ranvier
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Acetylcholine causes the opening of which channel in the post-synaptic membrane?
Sodium ion channel
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Depolaristion only occurs in cells part of the nervous system. True or false?
False
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Following depolaristion, what ions are released from the sarcoplasmic reticulum?
Calcium ions
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Calcium ions bind to [1] on [2] molecules, freeing binding sites for [3] on [4] filaments
1: Troponin, 2: Tropomyosin, 3: Myosin heads, 4: Actin
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Describe the role of ATP in the sliding filament theory.
ATP binds to myosin head, releasing it from actin, then it is hydrolysed to ADP, 'recocking' the head.
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During striated muscular contraction:
The sarcomere, I band and H zone become narrower, the A band maintains its width
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Slow twitch fibres contain:
Large stores of myoglobin and glycogen, many mitochondria and a rich blood supply
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The ability for a cell to differentiate into any other type of cell in an organism is referred to as what?
Totipotency
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Stem cells can only be obtained from embryos. True or false?
False
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When using stem cells to repair damaged tissues, the patient's own stem cells are often used. Why is this?
To prevent the rejection of the treatment due to the presence of foreign antigens
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The act of [1] binding to a receptor on [2] causes a conformational change, releasing the [3] molecule, allowing [2] to bind to [4] in the nucleus and initiate transcription.
1: oestrogen, 2: a transcriptional factor, 3: inhibitor, 4: DNA
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[1] may bind to [2] and 'guide' it to [3] to which [1] has [4], the [2] then cuts the [3], preventing translation.
1: siRNA, 2: a hydrolytic enzyme, 3: mRNA, 4: a complementary base sequence
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During vasoconstriction...
...the arterioles feeding skin capillaries contract using C-muscles and the shunt vessels dilate
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The main hormones responsible for the regulation of blood glucose concentration are:
Insulin, glucagon and adrenaline
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Normal blood glucose concentration (BGC) is:
90mg per 100cm^3 blood
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The second messenger model, as applied to the action of adrenaline, is:
Adrenaline binds to cell-surface receptors, causing an enzyme on the inside of the cell membrane to activate and convert ATP into cAMP, which then acts as a second messenger, activating enzymes responsible for glycogenolysis
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A hormone from question 24 is secreted from the alpha cells of the pancreas. What are its effects?
It increases blood glucose concentration by stimulating glycogenolysis and gluconeogenesis.
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What does it mean to suffer from 'Type I' diabetes mellitus?
Type I diabetics do not produce sufficient insulin, suspected to be due to an autoimmune response to pancreatic cells and must inject insulin to maintain their BGC.
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Oestrogen...
...is secreted from maturing follicles and inhibits LH and FSH secretion up until a critical threshold, upon which they are in fact stimulated.
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Progesterone...
...is secreted from the corpus luteum and maintains the uteral lining (if a fertilised egg has attached).
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Summarise the differences between DNA and RNA.
The backbone of DNA is based upon deoxyribose whereas RNA's backbone is based upon ribose, RNA uses uracil in place of thymine.
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During transcription, [1] 'unzips' the DNA strand and [2] moves in to create complementary [3]. The DNA strand has only ~[4] bases separated during this process.
1: DNA helicase, 2: RNA polymerase, 3: pre-mRNA, 4: 10
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Splicing removes [1] from [2], turning it into [3]
1: introns, 2: pre-mRNA, 3: mRNA
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A complete gene, comprised of 37.5% introns, in a particular DNA section undergoes transcription, splicing then translation. The original DNA section was 1.728kBp long. What is the number of amino acids in the resulting polypeptide?
359
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During translation, there are x tRNA molecules paired to the mRNA molecule and being operated on by a ribosome, and as many as y ribosomes operating on the mRNA. xy ~ ?
100
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A deletion or insertion, unless of a multiple of X, will cause Y. What are X and Y?
X is 3, Y is frame shift
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If a [1] mutates it may become a [2] which stimulates [3], leading to uncontrolled cell division, or a [4]
1: proto-oncogene, 2: oncogene, 3: cell division, 4: tumour
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Other cards in this set

Card 2

Front

The chemical responsible for positive phototropism in plant shoots is ___?

Back

Indoleacetic Acid

Card 3

Front

How does the chemical from question 2 affect tissues in the ROOT?

Back

Preview of the front of card 3

Card 4

Front

Heart rate is controlled by what region of the brain?

Back

Preview of the front of card 4

Card 5

Front

The chemo- and pressure receptors responsible for keeping the heart rate in check are found where?

Back

Preview of the front of card 5
View more cards

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