(c) Cu ions released from copper-releasing Intra
Uterine Devices (IUDs) suppress sperm motility.
(c) A few animals excrete nitrogen that comes
from the metabolism of purines (e.g., adenine and
guanine). Purines can be broken down to ammonia
only if the animal has the specific enzymes. Most
animals excrete purine nitrogen as uric acid or as
one or more intermediate products.
(a)
38.(d) Bright’s disease is a historical classification of
kidney diseases that would be described in modern
medicine as acute or chronicnephritis. It was
characterised by edema, the presence of albumin
in the urine and was frequently accompanied by
high blood pressure (hypertension) and evidence
of heart disease.
(d) Prolonged thiamine deficiency in diet leads to
loss to muscle tone and damage to nerves.
(c) Secondary metabolites are typically organic
compounds produced through the modification
of primary metabolite synthases. Examples
of secondary metabolites with importance in
industrial microbiology include atropine and
antibiotics.
41. (a) The transition state is the transitory of
molecular structure in which the molecule is no
longer a substrate but not yet a product.
The substrate binds to the enzyme at its active
site forming an enzyme-substrate complex. This
complex formation is a transient and unstable
process and soon the product is formed at the
active site.
42. (c) About 7% of human sera in IgM. It is
the largest antibody with a molecular weight
9,00,000 daltons. It is the principal antibody of
primary antibody response. When B-lymphocytes
are stimulated, this antibody appear first.
43. (d)
44. (a) Order Physarales include Physarum species.
The fruiting bodies are characterised by the
presence of abundant amount of calcium salt.
Physarum polycephalum is the best known
organism.
45. (c) An elastic cartilage has matrix which is rich
in elastic fibres or yellow fibres. It provides
elasticity to the part in which it is present.
(d)
(d)
(c) The typhlosole is found in the intestine of
earthworms. It increases the absorptive surface of
the digestive tract.
(d) Hookworm is a triploblastic pseudocoelomate,
bilaterally symmetrical human parasite which is
oviparous.
5.(b)Dinoflagellates have 2 flagellas, one from
longitudinal direction and another from transverse
direction which provides it forward motion and
spin to the dinoflagellates.
6. (c)
7. (a) Members of Monera and Protista consists
of organisms which are photosynthetic (Even
