- Given below is the diagrammatic sketch of a certain type
of connective tissue. Identify the parts labelled a, B, c
and D, and select the right option about them.
A B C D
(a) macrophage Fibroblast collagen mast cell
fibres
(b) mast cell macrophage Fibroblast collagen
fibres
(c) macrophage collagen Fibroblast mast cell
fibres
(d) mast cell collagen Fibroblast macrophage
fibres
- arrange the steps of catalytic action of an enzyme in
order and choose the right option.
I. The enzyme releases the products of the reaction and
the enzyme is free to bind to another substrate.
II. The active site of enzyme is in close proximity of
the substrate and breaks the chemical bonds of the
substrate.
III. The binding of substrate induces the enzyme to alter
its shape fitting more tightly around the substrate.
IV. The substrate binds to the active site of the enzyme
fitting into the active site.
(a) IV, III, II, I
(b) III, II, I, IV
(c) IV, II, I, III
(d) II, I, IV, III
- Select the incorrect statement.
(a) amino acids are substituted methanes.
(b) Glycerol is a trihydroxy propane.
(c) Lysine is a neutral amino acid.
(d) Lecithin is a phospholipid.
- In cockroach the flow of haemolymph is
(a) heart → head → perineural sinus → perivisceral
sinus → pericardial sinus → ostia → heart
(b) heart → pericardial sinus → head → perineural
sinus → perivisceral sinus → ostia → heart
(c) heart → head → perineural sinus → perivisceral
sinus → ostia → pericardial sinus → heart
(d) heart → ostia → perivisceral sinus → pericardial
sinus → head → perineural sinus → heart.
23. Which one of the following biomolecules is correctly
characterised?
(a) Lecithin - a phosphorylated glyceride found in cell
membrane.
(b) Palmitic acid - an unsaturated fatty acid with 18
carbon atoms.
(c) adenylic acid - adenosine with a glucose phosphate
molecule.
(d) alanine amino acid - contains an amino group and
an acidic group anywhere in the molecule.
24. Which of the following statements is incorrect about
G 0 phase?
(a) mitosis occurs after G 0 phase.
(b) Biocatalysts can be used to exit G 0 phase.
(c) cell volume keeps on increasing during this phase.
(d) cell metabolism occurs continuously in G 0 phase.
25. Which of the following statements is not correct?
(a) Starch is a polymer of a-glucose.
(b) Starch is made up of amylose and amylopectin.
(c) amylose is linear structure consisting of several
glucose residues joined by 1,4-glycosidic linkages.
(d) amylopectin is a straight chain with several glucose
residues joined only by 1,4-glycosidic linkages.
26. If a plant produces flowers when exposed only to
alternating periods of 5 hours light and 3 hours dark,
in a 24-hour cycle, then the plant should be a
(a) short-long day plant
(b) short day plant
(c) day neutral plant
(d) long day plant.
27. a red blood corpuscle (rBc) was kept in a solution and
treated so that it became inside-out. What will be the
polarity of the phospholipid bilayer in this cell?
(a) (b)
(c) (d)
