1.What happens to the Cdk-cyclin A complex at metaphase
- Both cyclin A and Cdk remain undegraded
- Only Cdk is degraded
- Only cyclin A is degraded
- Both cyclin A and Cdk are degraded
2.
The average human genome has approximately 3×109 base pairs coding for
various
proteins. If an “average” protein contains 400 amino acids, what is the
Maximum
number of proteins that can be encoded by the human genome?
- 2.5 × 106
- 2.5 × 107
- 3.0 × 106
- 3.5 × 107
3.
In eukaryotes, the interaction of enhancer and promoter elements is brought
closer
by
- zinc finger.
- DNA looping.
- helix turn helix.
- palindrome.
4.
Which of the following cytoskeleton elements guides the movement of vesicles
containing
cell wall precursors from their site of formation in Golgi to the site of
new
wall formation in a growing pollen tube?
- Myosin
- Actin
- Kinesin
- Dynein
5.
Ionophores are small hydrophobic molecules that can partition into the lipid
bilayer
and increase their permeability to specific inorganic ions. Which of the
following
is a channel forming ionophore?
- Valinomycin.
- Actinomycin.
- Gramicidin A.
- Nicin.
6.
Which GTPases regulate intracellular transport in mammalian cells through
vesicle
fusion?
- Rab
- Ran
- Ras
- Rho
7.
The region where RNA polymerase binds to promoter in prokaryotes is called
- Pribnow box.
- Hogness box.
- Homeo box.
- Shine-Dalgarno box.
8.
Which of the following features highlights the difference between Z-DNA and
BDNA?
- Double helical nature
- Orientation of phosphate backbone
- Pairing of G – C
- Antiparallel nature of two polynucleotide strands of double helix
9.
Ribosomal subunits are assembled in
- cytoplasm.
- nucleolus.
- nucleus.
- endoplasmic reticulum.
10.
The absence of sigma factor in RNA polymerase
- affects elongation only.
- blocks initiation only.
- affects both initiation and elongation.
- does not affect transcription.
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