Ovulation is caused by
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excess of progesterone
-
mid-cyclic LH surge
-
mid-cyclic FSH surge
-
low oestrogen level
Following ovulation, cervical mucus
-
shows thick cellular pattern
-
shows fem like pattern on drying
-
is thin and shows cellular pattern
-
is thin and alkaline
The source of oestrogen in the postovulatory phase of the menstrual cycle is the
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Graafian follicle
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Primary follicle
-
atretic follicles
-
corpus luteum
Conduction rate is the fastest in
-
atria
-
AVN
-
Purkinje fibres
-
ventricle
Pacemaker potential
-
is in the form of a plateau potential
-
is due to a slow diastolic depolarization
-
is a graded potential
-
develops in the right atrial fibres
Cardiac muscle action potential is shown in the given diagram and its phases have been marked. Consider the following statements in this regard:
-
Phase I is due to closure of Na + channels and CI influx.
-
Phase II is due to opening of Ca2 + f channels and closure of K + channels.
-
Phase III is due to closure of Ca2 + channels and prolonged opening of K + channels.
-
Phase IV is due to opening of Na2 + channels and Cl-efflux.
Of these statements
-
1 and 2 are correct
-
2 and 4 are correct
-
1 and 3 are correct
-
2 and 3 are correct
Consider the following statement:
-
Experimental hypertension can be produced by stimulating sino-aortic nerve
-
Sino-aortic nerve normally stimulates vasomotor centre.
Of these statements
-
I is true but II is false
-
both I and II are true
-
I is false but II is true
-
both I and II are false
Consider the following statements: Periodic (Cheyne-Stokes) breathing is seen
-
after voluntary apnoea.
-
after voluntary hyperpnoea.
-
at high altitude
-
during wakeful states of adult human being
Of these statements
-
1, and 2 are correct
-
3 and 3 are correct
-
2, 3 and 4 are correct
-
1, 3 and 4 arc correct
Okasald fragments are short pieces of DNA replicated
-
continuosly in the 5 ‘3’ direction
-
discontinuosly in the 3 ‘-5’ direction
-
continuosly in the 3 ‘5’ direction
-
discontinuosly in the 5 ‘-3’ direction
Clearance values of four different substances have been plotted against their plasma concentrations in the given graph. Clearance of which one of the following substances would correspond to the curve labelled 4 in the given graph? x-axis: Plasma concentration of the substance (mg/100 ml) y-axis: Clearance value (ml/rain)
-
PAH
-
Inulin
-
Urea
-
Glucose
Fats are digested in the sequence
-
a-β diglyceride, a monoglyceride, fatty acids, glycerol
-
a-β diglyceride, β monoglyceride, fatty acids, glycerol
-
a-? diglyceride, monoglyceride, fatty acids, glycerol
-
a-? diglyceride, a monoglyceride, fatty acids, glycerol
Oxidation of one molecule of acetyl Co-A in TCA cycle will liberate
-
12 ATP
-
15 ATP
-
24 ATP
-
30 ATP
The codons UAA, UAG and UGA
-
code for phenylalanine
-
initiate protein synthesis
-
elongate the protein chain
-
signal the termination of protein synthesis
Degeneracy of the genetic code denotes the existence of
-
Condons consisting of only two bases
-
codons that include one or more of the unusual bases
-
multiple condons for a single amino acid
-
base triplets coding for different amino acids
Intermediates in citric acid cycle do not take part directly in
-
gluconeogenesis
-
transamination
-
fatty acid synthesis
-
glycogen synthesis