CSIR December 2015 Exam | Doubtful Answers [Life Sciences]

We are listing out some of the CSIR December 2015 Exam Doubtful Questions and their answers?

If you have any doubtful questions, please use below comments section.

Finally, you can doubtfull questions to submit to CSIR (latest by 22nd January 2016).

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Booklet A (Doubtful Questions/Answers).

10. Secondary colours are made by a mixture of three primary colours, Red, Green and Blue, in different proportions; each of the primary colours comes in 8 possible levels. Grey corresponds to equal proportions of Red, Green and Blue. How many shades of grey exist in this scheme?

1. 8³
2. 8 [CSIR Answer]
3. 38
4. 8 × 3


Since Grey= Red + Green + Blue
and each colour has 8 possibilities, and choosing all three are independent events, so the number of possibilities are 8 x 8 x 8 = 8³

22. A cell line deficient in salvage pathway for nucleotide biosynthesis was fed with medium containing ¹⁵N labelled amino acids. Purines were then extracted. Treatment with which one of the following amino acids is likely to produce ¹⁵N labelled purines?

1. Aspartic acid
2. Glycine
3. Glutamine [CSIR Answer]
4. Aspartamine


Even glcyine and Aspartic acid  can produce ¹⁵N labelled purines.


35. Which of the following is NOT a cell adhesion protein?

1. Cadherin
2. Selectin
3. Immunoglobulin (Ig) superfamily
4. Laminin [CSIR Answer]

Both Immunoglobulin and Laminin are cell adhesion proteins.

52. In a heterozygous individual for a given gene, if a crossing over has occurred between the gene locus and the centromere of the chromosome, the segregation of the two alleles of the given gene will occur during meiosis at

1. either anaphase I or anaphase II
2. anaphase I only
3. anaphase II only [CSIR Answer]
4. both anaphase I and II


57. In the following equations
(a) dN /dt = rN
(b) Nt = N_o e^rt
(c) dN /dt = rN (K-N/K)
(d) dN/dt = rN x N/K

exponential population growth is described by

1. a and b [CSIR Answer]
2. a only
3. c only
4. b and d

Nt = N_o e^rt is wrongly printed. It should be like this  N_t = N_o e^rt


64. Application of gene therapy in clinical trials did NOT succeed due to

1. poor integration of a gene in the host genome
2. lack of expression of integrated gene in cells
3. degradation of gene inside the cell
4. activation of oncogenes consequent to integration of the gene [CSIR Answer]

100. In C. elegans, an anchor cell and a few hypodermal cells take part in the formation of vulva. The experiments performed to understand the role of these cells in vulva formation and the results obtained are as follows:

If the anchor cell is killed by laser beam, hypodermal cells do not participate in vulva formation and no vulva develops.

If six hypodermal cells closely located with anchor cell (called vulva precursor cells) are killed, no vulva develops.

If the three central vulval precursors are destroyed, the three outer cells, which normally form hypodermis, take the fate of vulval cells instead.

Following are certain statements regarding vulva formation:

A. Anchor cell acts as an inducer

B. Six hypodermal cells with the potentiality to form vulva, form an equivalence group

C. Three, out of six hypodermal cells participate in vulva formation

D. The central cell functions as the 1° cell and the two cells on both side act as the 2° cells

E. The 1° cell secretes a short range juxtacrine signal

Which combinations of the above statements have been derived from the above experimental results?

1. A, B and C [CSIR Answer]
2. A, B and D
3. D and E
4. B, D and E



Even statement D is correct.

114. Two siblings who inherit 50% of the genome from the mother and 50% from the father snow lot of phenotypic differences. Which one of the following events during gametogenesis of the parents will maximally contribute to this difference?

1. Mutation
2. Recombination
3. Independent assortment [CSIR Answer]
4. Environment

137. A student noted the following points regarding Agrobacterium tumefaciens:

A. A. tumefaciens is a gram-negative soil bacterium

B. Opine catabolism genes are present in T-DNA region of Ti-plasmid.

C. Opines are synthesized by condensation of amino acids and alpha-ketoacids or amino acids and sugars.

D. A callus culture of crown gall tissue caused by A. tumefaciens in plants can be multiplied without adding phytohormones.

Which one of the combinations of above statements is correct?

1. A, B and C

2. A, B and D

3. B, C and D

4. A, C and D [CSIR Answer]

C statement confusion.

The vast majority are opines are formed by condensation of an amino acid, either with a keto acid or a sugar.

SET B Question Paper



Tables are interchanged for Question Number 129 and 131.



   

Difficult to tell what CSIR will do for above questions.