a) one schwann cell can myelinate up to 40 neurons
b) oligodenotocytes are the scavenger cells of the CNS
c) microglia are the scavenger cells of the PNS
d) there are up to three glial cells per neuron in the nervous system
e) protoplasmic astrocytesase found in grey matter
a) Sunday morning syndrome mainly affects C fibres
b) local anaesthetics primarily affect A fibres
c) preganglionic autonomic fibres are type B
d) C fibres have the largest diameter
e) B fibres are the least susceptible to hypoxia
a) exocytosis requires Ca2+ and energy
b) Na+-K+-ATPase is an example of facilitated diffusion
c) amiloride activates epithelial Na+
channels
d) clathrin is essential for vesicle exocytosis
e) water can only enter cells via water channels
a) the human genome encodes 3 X 109
genes
b) adenine binds to cytosine and guanine to thymine
c) uracil replaces thymine in RNA
d) 3% of DNA are introns
e) haploid DNA in germ cells is single stranded
a) the cytoskeleton is composed of hydroxyapatites
b) the mitotic spindle is composed of actin microtubules
c) myosin is the most abundant protein in cells
d) colchicine stabilises microtubules preventing organelle movement
e) actin-myosin interaction allows cells to move
a) NADH-DH, 5DH, bc, cox synthesise ATP
b) the matrix is between the inner and outer mitochondrial DNA
c) mitochondrial DNA is not transmitted paternally
d) 99% of mitochondrial proteins are encoded by mitochondrial DNA
e) ATP synthetase is powered by an electron gradient
a) blood volume is 8% total body weight
b) 2/3 total body weight is ECF
c) 75% of ECF is blood plasma
d) water content of lean tissue is 25%
e) total body water increases with increasing age
a) genome inheritance is strictly maternal
b) the citric acid cycle occurs at the outer membrane
c) the space between the two membranes is called the matrix
d) the mutation rate for mitochondrial DNA is less than for nuclear DNA
e) involutions of the outer membrane are called cristae
a) inulin
b) D2O
c) Evan’s blue
d) radioactive chromium
e) iron isotopes
