(c)
(d)
- In regulation of gene expression in
prokaryotes
i. Lactose acts as suppressor for gene
expression.
ii. Tryptophan is inducer.
iii. Regulator gene produces repressor ...
(a) i alone is correct (b) ii alone is correct
(c) iii alone is correct
(d) ii and iii are coorect - Read the statement regarding the lac
operon and choose the correct option
i. An inducer regulates the switching on
and off the lac operon
ii. Repressor protein dissociated from
operator region and prevents RNA
polymerase from transcribing the
operon.
iii. In the presence of lactose, the repressor
is activated by interaction with lactose.
iv. RNA polymerase has access to the
promoter and transcription proceeds
only when the repressor is inactivated.
(a) i and ii alone are correct
(b) ii alone is correct
(c) iii and iv alone are correct
(d) i and iv alone are correct - Select the correct sequences of steps in
DNA finger printing involving Southern
blot hybridization using radiolabeled
VNTR as probes.
i. Hybridization using labelled VNTR
probe
ii. Isolation of DNA
iii. Transferring (Blotting) of separated
DNA fragments to synthetic
membranes, such as nitrocellulose or
nylon.
iv. Detection of hybridization DNA
fragments by autoradiography.
v. Separation of DNA fragments by
electrophoresis
vi. Digestion of DNA by restriction
endonucleases
(a) i, v, vi, ii, iii and iv
(b) v, i, vi, iii, iv and ii
(c) ii, vi, v, iii, i and iv
(d) ii, i, v, vi, iv and iii
DNA fingerprinting works because-
(a) There are mutiple alleles for some
DNA sequences, making it possible to
obtain unique patterns for each
individual
(b) DNA in the skin cells is very diverse
(c) Genes containing the same alleles
make it simple to compare different
individuals
(d) PCR allows amplification of proteins
from single cells
- A mixture containing DNA fragments
A,B,C and D with molecular weights of
A+B=C, A>B and D>C, was subjected to
agarose gel electrophoriesis. The positions of
these frangments from cathode to anode
sides of the get would be-
(a) C, B, A, D (b) B, A, D, C
(c) B, A, C, D (d) A, B, C, D - The probability of occurrence of DNA
polymorphism in non-coding region is
more because
(a) It is beneficial to human beings
(b) It may not have any immediate effect
on individuals’ reproductive ability
(c) It is not always inheritable
(d) None of these - Initially, it was believed that the
human genome has 100,000 gene. But the
declaration of human genome project has
shown that the number of genes in human
genome is approximately
(a) 20,000 (b) 50,000
(c) 60,000 (d) 70,000 - During chromosome DNA replication, the
following events occur
i. Breaking of H bonds between bases.
ii. Bonds between adjacent nucleotide
form.
iii. Winding brings about formation of two
double helices.