UPSC Mains 2017 Botany Optional – Test 3 : Mains Marathon

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Dear Friends,

Here is the 3rd Mains Marathon Botany Optional Test.

We have decided to move section wise with the basic understanding of each topic of every paper.

In the mid-September we will do the complete paper every week so that you can get the feel to complete the paper before real exam (October 2017).

We hope you will enjoy the initiative.

                                                          BOTANY – PAPER – II

Time Allowed: Three Hours                                                                                    Marks: 250


1. Giving reasons explain the following:

a) Discuss the role of the p53 gene in the regulation of the cell cycle. (10M)

b) Define the Lyon hypothesis. (10M)

c) What types of genetic selection is used by Ames test? (10M)

d) What is a single orphan gene? What is an orphan family? (10M)

e) What are the advantages of using PCR instead of cloning to amplify a DNA template? (10M)

2.  a) What is the difference between a DNA chip and a protein chip? How is a protein chip used to analyze the proteome? (15M)

b) What is meant by constitutive gene expression? How is constitutive gene expression unlike regulated gene expression? (15M)

3. a) Does mitosis or meiosis have greater significance in the study of heredity? Explain. (15M)

b) Phage vector used for cloning kill the host bacterial cell in which they are propagated. How can this be advantageous for working with DNA clone? (15M)

                                                                     SECTION – B

5. Explain the following:

a) Gap junction proteins. (10M)

b) Proteolytic enzymes in the digestive process. (10M)

c) What is the significance of diffusion pressure deficit in water absorption? (10M)

d) Role of landscape in biodiversity. (10M)

e) Give significance of correlation in plant breeding. (10M)

6. a) Give critical account of ETS in plant mitochondria. Explain cyanide resistant pathway. (15M)

b) Explain the concept of Stomatal action and mechanism of signal transduction in guard cell. (15M)

c) Explain the biochemical change which occur during seed germination. (10M)

d)  How are protein classified? Explain the mechanism of biosynthesis and degradation of protein. (15M)

7.  a) How do gene tree differ from species tree? Why multiple genes are used to develop a species tree? (10M)

b) What are some of the advantages of using DNA sequences to infer evolutionary relationship? (10M)

c) Explain with suitable the advantages of tissue culture technique over conventional methods of crop improvement. (15M)

All Mains Marathon Optional Questions are updated in this page.







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