921.The nuclear membrane
A.Allows molecules only of MW<1000 through its nuclear pores
B.Is continuous with the ER
C.Is lined with oxidative phosphorylation enzymes
D.Is impermeable to RNA
E.Consists of 3 distinct layers

922.ATP
A.Is acetyl tetraphosphate
B.Supplies the energy for muscle contraction
C.Is largely formed in the ER
D.Contains no nitrogen
E.Stores energy in special sulphate bonds

923.Intracellular fluid
A.Contains phosphate in similar concentrations to extracellular fluid
B.Has a lower PCO2than extracellular fluid
C.Has a K+ concentration of 110meq/L
D.Has a pH of 7.5
E.Contains more Mg than ECF

924.All of the following are endogenous antioxidants except
A.Glutathione
B.Transferring
C.Superoxide dismutase
D.Catalase
E.Ferrous sulphate

925.Regarding ribosomes
A.There are 3 subunits
B.They are 65% DNA
C.They synthesise haemoglobin
D.They contain 30% DNA

926.Smooth ER
A.Is the site of cell steroid production
B.Is the site of cell protein synthesis
C.Is the site of cellular cytochrome oxidases

927.Which of the following is an anti-oxidant
A.Vitamin D
B.Vitamin B12
C.Vitamin E
D.Vitamin K
E.Vitamin B6

928.bradykinin
A.causes smooth muscle dilation
B.kallikrein causes prohormone degradation to producebradykinin

929.Which is true regarding hyperthyroidism
A.Common causes include thyroiditis
B.Thyroid storm has a 20-25% mortality rate
C.It is associated with increased levels of TSH
D.It is often due to Iodine deficiency
E.Clinical changes increase periorbital oedema

930.Regarding the OCP, it is protective against
A.Venous thrombosis
B.Breast carcinoma
C.Cervical carcinoma
D.Ovarian carcinoma
E.Hepatic adenoma

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