Cell biology Plz do as much as you can D. All of the above. . Transmission elect

Question

Cell biology Plz do as much as you can D. All of the above. . Transmission electron microscopy (TEM) has a higher resolustion A. it has stronger lenses than light microscopy. B. the sample remains alive under the TEM C. the calculated wavelength of electrons allows higher resolution. D. All of the above. than light microscopy primarily becauane. 37. Myelin is essential for rapid conduction of axon potentials because A. it acts as a diffusion barrier to keep sodium channels at the node of Ranvier B. it insulates the axon to prevent leakage of current. C. it is necessary for saltatory conduction. D. all of the above. 38. Which molecular families participate in vesicle fusion with target me membranes A. Ran GTPases. B. Rab GTPases. C. SNARES D. A and C only. E. B and C only. 39. Transduction in olfactory and visual systems is distinct in that... A. activation of olfactory receptors depolarizes the membrane while activation of visual receptors hyperpolaria membrane. B. activation of olfactory receptors hyperpolarizes the membrane while activation of visual receptors depolas membrane. C. cyclic nucleotides are involved in visual transduction but not olfactory D. Olfactory is G-protein coupled receptor mediated while visual is mediated by receptor tyrosine kinase 40. NH2 This molecule is... A. NADPH B. Acetylcholine C. Glutamate D. CAMP E. ATP . The size of a typical mitochondrion would be approximately A. 50 nm B. 500 nm C. 100 pum D. 500 ?m

Explanation / Answer

36. C

The electrons used in electron microscopy have much shorter wavelength.

37. D

Myelin sheath is to increase the speed with which impulses propagate along the myelinated fibre and also insulate the fibre.

38. C

SNARES proteins help in vesicle fusion in the presence of incresed intracellular calcium concentration.

39. A

40. D cAMP

41. B 500nm

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