The sarcomere, I band and H zone become narrower, the A band maintains its width
The sarcomere and H zone become narrower, the A and I bands maintain their
The sarcomere lengthens, the H zone remains the same size, the A and I bands both shorten
7. 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
1,000
10,000
8. Acetylcholine causes the opening of which channel in the post-synaptic membrane?
Sodium ion channel
Potassium ion channel
Calcium ion channel
9. The chemo- and pressure receptors responsible for keeping the heart rate in check are found where?
In the carotid arteries
In the brain stem
In the aortic arch
10. Following depolaristion, what ions are released from the sarcoplasmic reticulum?
Sodium ions
Calcium ions
Potassium ions
11. 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
X is 2, Y is cancer
X is 3, Y is cancer
12. How does the chemical from question 2 affect tissues in the ROOT?
It inhibits elongation
It promotes elongation
It causes autolysis
13. Consider the following reaction pathway: A -> D -> 4C -> 2B -> X. Which of the following would cause the system to display negative feedback?
X decomposes into a sixth species, E
X inhibits one or more of the enzymes involved in the pathway
X promotes one or more of the enzymes involved in the pathway
14. 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?
577
575
359
360
361
576
15. Stem cells can only be obtained from embryos. True or false?
11.5
False
True
16. 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.
Type I diabetics have cells which are unresponsive to insulin (often due to obesity), and so must manage their carbohydrate intake to maintain their BGC
17. In myelinated neurons, depolarisation can only occur where?
Dendrites
Nodes of ranvier
Nodes of his
18. Normal blood glucose concentration (BGC) is:
90mg per 100cm^3 blood
9mg per 100cm^3 blood
100mg per 100cm^3 blood
10mg per 100cm^3 blood
19. During vasoconstriction...
...the arterioles feeding the skin capillaries contract, and so do the shunt vessels.
...the arterioles feeding skin capillaries contract using C-muscles and the shunt vessels dilate
...the arterioles feeding the skin capillaries dilate by relaxing C-muscles, and the shunt vessel contracts
20. The chemical responsible for positive phototropism in plant shoots is ___?