During muscular contraction, which of the following events occur
(i) H-zone disappears
(ii) A band widens
(iii) I band reduces in width
(iv) Width of A band is unaffected
(v) M line and Z line come closer
(i), (iii), (iv) and (v)
(i), (i) and (v)
(ii), (iv) and (v)
(i), (ii) and (iii)
A.
(i), (iii), (iv) and (v)
Muscle contraction is brought about by sliding of the actin filaments over myosin filaments. When a muscle fibril contracts, its A band remains constant and I band shortens. H zone also disappears as the actin filaments of both sides in each sarcomere may overlap each other at M line.
Leghaemoglobin is produced in response to
respiration
photosynthesis
fatty acid synthesis
N2 fixation
Catecholamine in a normal person induces
intense salivation
alertness
decrease in heart beat
excessive urination.
Microtubule depolymerizing drug such as colchicine is expected to
inhibit spindle formation during mitosis
inhibit cytokinesis
allow mitosis beyond metaphase
induce formation of multiple contractile rings
Apiculture is associated with which of the following groups of plants
Grapes, maize, potato
Sugarcane, paddy, banana
Guava, sunflower, strawberry
Pineapple, sugarcane, strawberry
Oxygen binding to haemoglobin in blood is
directly proportional to the concentration of CO2 in the medium
inversely proportional to the concentration of CO2 in the medium
directly proportional to the concentration of CO in the medium
independent of the concentration of CO in the medium
The release of chemical messenger from synaptic vesicles is under the influence of these ion(s).
Cl-
Fe and S2+
Ca2+
Mg2+ and Sr2+
Which of the following cartoon characters does not share its name with that of a gene
Tintin
Popeye
Asterix
Obelix
Which of the following is correctly labelled for the given figure
A: PS II; B : PS I; C :e- acceptor, D: LHC
A: LHC; B:e- acceptor; C: PS I; D: PS II
A: PS I; B:PS II; C:e- acceptor; D: LHC
A: e- acceptor; B : LHC; C: PS Il; D: PS I