Transition state structure of the substrate formed during an enzymatic reaction is
transient but stable
permanent but unstable
transient and unstable
permanent and stable
A phosphoglyceride is always made up of
only a saturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached
only an unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached
a saturated or unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached
a saturated or unsaturated fatty acid esterified to a phosphate group, which is also attached to a glycerol molecule
Pigment-containing memberanous extensions in some cyanobacteria are
heterocysts
basal bodies
pneumatophores
chromatophores
The complex formed by a pair of synapsed homologous chromosomes is called
equatorial plate
kinetochore
bivalent
axoneme
The three boxes in this diagram represent the three major biosynthetic pathways in aerobic respiration. Arrows represent net reactants or products
Arrows numbered 4, 8 and 12 can all be
NADH
ATP
H2O
FAD+ or FADH2
During seed germination its stored food is mobilised by
ethylene
cytokinin
ABA
gibberellin
D.
gibberellin
Gibberellin induces aleurone cells to secrete enzyme to break stored food in seed. Cytokinines promote nutrient mobilisation, which helps in the delay of leaf senescence. ABA plays an important role in seed development, maturation and dormancy. Ethylene induces fruit ripening, breaks seed dormancy.
Which of the following criteria does not pertain to facilitated transport?
Requirement of special membrane proteins
High selectivity
Transport saturation
Uphill transport
The first stable product of fixation of atmospheric nitrogen in leguminous plants is
NO2-
ammonia
NO3-
glutamate