Online Test

TEST-1 ( IIT-JAM-BS )

Total Questions : 10, Time : 00:30:00
Question: 1

Ecological adaptations in which some organism are favored due to more energy investment on their reproductive rate while other on basis of channelizing energy for homeostasis. Such a selection strategies are termed as-

A. 

K selection and r selection
B. 

Logistic and exponential selection
C. 

Directional and disruptive selection
D. 

Kin and group selection
Question: 2

_____ from a blood clot stimulates the growth of cells in the healing process.

A. 

EGF

B. 

PDGF

C. 

MPF

D. 

NGF

Question: 3

Which statement concering stomatal function is false?

A. 

To close stoma, potassium ions diffuse passively out of the guard cells
B. 

When stomata are about to open, potassium ions are actively transported into the guard cells from the surrounding cells of the epidermis
C. 

Stomata are open when the turgor pressure of the guard cells decreases
D. 

Low levels of carbon dioxide stimulate the opening of stomata
Question: 4

Cells were obtained from a patient with a viral infection. The DNA extracted from these cells consisted of two forms : double - stranded human DNA and single-stranded viral DNA. The base compositions of these two forms of DNA were as follows :
                        A                C            G            T
    Form 1    22.1%    27.9%    27.9%    22.1%
    Form 2    31.3%    31.3%    18.7%    18.7%
    Which form was the viral DNA.

A. 

Form 1
B. 

Form 2
C. 

Both (A) and (B)
D. 

None of these
Question: 5

An antibody made against the antigen tetanus toxoid (TT) reacts with it even when the TT is denatured by disrupting all disulfide bonds.  Another antibody against TT fails to react when the TT is similarly denatured.  The most likely explanation can be stated as follows:

A. 

The first antibody is specific for several epitopes expressed by TT.
B. 

The first antibody is specific for the primary amino acid sequence of TT, where as the second is specific for conformational determinants.
C. 

The second antibody is specific for disulfide bonds.
D. 

The first antibody has a higher affinity for TT.
Question: 6

A. 

1700
B. 

1900
C. 

2100
D. 

2300
Question: 7

Match the following -
List-i(Gene)    List-ii (Function of encoded protein)
(P) vpu             1. Increase viral replication down - regulates host cell CD-4
(Q) vpr             2. Weakly activates transcription of proviral DNA
(R) vif              3. Required for efficient viral assembly and budding
(S) nef            4. Promotes infectivity of viral particle

A. 

P-1, Q- 2, R- 3, S- 4
B. 

P- 1, Q- 3, R- 2, S- 4
C. 

P- 3, Q- 2, R- 4, S- 1
D. 

P- 4, Q- 3, R- 2, S- 1
Question: 8

A. 

Both 1 & 2
B. 

Both 1,2 & 3
C. 

4 Only
D. 

All of these
Question: 9

The Casparian strip -
P. limits the pathway available to water and solutes, forcing them to enter the symplast
Q. surrounds the root vascular tissue
R. allows water to move down a water potential gradient
S. is made of suberin

A. 

P, Q
B. 

R,S
C. 

P, R, S
D. 

P, Q, R, S
Question: 10

The committed step in the de novo synthesis  of purine  nucleotides is the  formation of

A. 

ribose 5 - phosphate from ribose 1 - phosphate
B. 

5’ - Phosphoribosyl - 1- Pyrophosphate (PRPP) from ribose  5- phosphate
C. 

5’  phosphoribosylamine  from PRPP
D. 

5’- Phosphoribosylglycinamide from 5’ - phosphoribosylamine
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