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Some examples from this set of practice questions
1.
State the three methods we compare and categorise organisms.
Answer: Comparative embryology Comparative physiology Molecular phylogenetics
2.
State the three methods we compare and categorise organisms.
Answer: Comparative embryology Comparative physiology Molecular phylogenetics
3.
All chordates have three features common to all of them, state them.
Answer: A notochord,Dorsal hollow nerve chord, endostyle/thyroid gland
4.
State Krogh’s principle
Answer: For every natural process or phenomena, we want to study there is probably a model organism on which we could study.
5.
What ion channel loss leads to a congenital inability to detect pain?
Answer: SCN9A gene mutation causes loss of functional sodium ion channels.
6.
Name four toxins that can be used to isolate ion channels.
Answer: Sodium : Tetradotoxin and saxiton Potassium : 4AP (4-aminopyridine),TEA(tetraethyammonium)
7.
How many domains and TM helices do Sodium ion channels have?
Answer: 4 homologous domains each with 6 TM helices.
8.
Explain the voltage sensitivity of sodium ion channels.
Answer: Sodium ion channels have the S4 region that is positively charged and is repelled when the inside of the cell becomes positive and it drags the p-loop along with it to close the channel to prevent further sodium ions from coming in.
9.
What is the pore forming region of the sodium ion channel?
Answer: Domains 3 and 4
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