Part-B
1.Which
of the following is not a pathway for biosynthesis of Auxins?
a.
Indole-3-pyruvic acid pathway
b.
Tryptamine pathway
c.
Indole-3-acetonitrile pathway
d. Oxindole-3-acetic
acid pathway
2.Mark
out the appropriate difference between r and k selected species
a.
R- Density dependent regulation K
Density
independent regulation
b.
R- abiotic factors K- biotic factors
c.
R – low r max K- High r max
d. Both
b) and c)
3.In
syncytial specification, the fates of cells can be determined by
__________________ within the egg cytoplasm
a.
gradients of morphogens
b.
Ectoderm
c.
Mesoderm
d. Endoderm
4.Competence
is the ability to bind and to respond to the inducers, and it is often the
result of a inducing protein. __________ are inducing proteins that bind to
cell membrane receptors in competent cells.
a. Paracrine factors
b. Juxtacrine factors
c. neurotransmitters,
d. cytokines
5.Mammalian
sperm bind to the zona pellucida before undergoing the acrosome reaction. In
the mouse, this binding is mediated by ____________ and one or many sperm
proteins that recognize it.
a.
ZP3 (zona protein 3)
b.
ZP2 (zona protein 2)
c.
ZP1 (zona protein 1)
d. ZP4
(zona protein 4)
6.Media
containing spores can be sterilized by
a.
pasteurization
b.
UV
c.
dry heat
d. tyndallisation
7.Two
proteins have same molecular weight and same isoelectric focusing .The best way
to seperate them will be
a.
Ion exchange chromatography
b.
Gel filtration chromatography
c.
Reverse phase chromatography
d. Chromato-focussing
8.The
separation principle of dialysis is
a.
diffusion
b.
charge
c.
turbulence
d. solubility
9.EcorI
restriction enzymes produce cohesive (sticky) ends. This means that they
a.
Cut both DNA strands at the same base pair
b.
Cut in regions of high GC content,leaving ends that can form more hydrogen
bonds
than
ends of high AT content
c.
Make a staggered double –stand cut, leaving ends with a few nucleotides of single-standed
DNA protruding.
d.
Stick tightly to the ends of the DNA they have cut.
10.In
recombinant DNA technology, invitro packing is used to
a.
Cut a desired region out of the bacterium`s chromosome
b.Ensure that genetically engineered bacteria
are not accidentally released into the environment.
c.Incorporate recombinant DNA into infectious
bacteriophage particles.
d. Very effective
11.Which
of the following does not apply to the construction or use of a DNA library?
a.
Many segment of DNA from a cellular genomes are cloned
b.
Specialized DNA libraries can be made by cloning DNA copies of mRNAs.
c.
The DNA copies of mRNA found in
a
cDNA library are made by reverse transcriptase.
d.Genomic
libraries are better for expressing gene products than cDNA libraries.
12.Two
sites that are often used to grow animal viruses
a.
Chorioallantoic membrane and allantoic cavity
b.
Yolk sac and amniotic cavity
c.
Amniotic cavity only
d.
Yolk sac only
13.Which
of the following organism produce hydrogen peroxide as virulence factor
a.
Mycoplasma
b.
Streptococcus species
c.
Salmonella sp
d.
Pseudomonas
14.Glucose
effect is
a.
Higher the glucose concentration cause decreased cAMP
b.
Lower the glucose concentration caused decreased the cAMP
c.
Higher the glucose concentration caused increased the cAMP
d.Lower
glucose concentration cause increased cAMP
15.Increased
activity of calcitonin is seen during
a.
High blood calcium level
b.
Low blood calcium level
c.
Decreased osteoclast activity.
d.
All of the above
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