BOT/VI/11 Student's Copy
2 0 1 8
6th Semester
BOTANY
ELEVENTH PAPER
Plant Metabolism, Biochemistry and Thermodynamics
Full Marks 55
Time 2½ hours
PART A—OBJECTIVE
Marks 20
The figures in the margin indicate full marks for the questions
SECTION—A
Marks 5
Tick the correct answer in the brackets provided 1×5=5
1. During DNA replication, helicase
adds new nucleotides to the lagging strand
adds new nucleotide to the leading strand
removes supercoiling ahead of the replication fork
unwinds the DNA strand
/515 1 Contd.
2. Which of the following enzyme is not a requirement of protein synthesis?
Amino acyl-tRNA synthetase
Translocase
Topoisomerase
Peptidyl transferase
3. Which of the following is naturally occurring gaseous hormone?
Auxin
Gibberellin
Cytokinin
Ethylene
4. Photosynthetic pigments are located in the
stroma
thylakoid
lamella
cytosol
5. The entropy of an isolated system can never
decrease
increase
be zero
None of the above
BOT/VI/11/515 2 Contd.
SECTION—B
Marks 15
Write notes on the following 3×5=15
1. DNA polymerase
2. Isoenzymes
3. Abscisic acid
4. Significance of pentose phosphate pathway
5. Concept of internal energy
PART B—DESCRIPTIVE
Marks 35
The figures in the margin indicate full marks for the questions
1. What is nitrogen metabolism? Give an account on biological nitrogen
fixation. 7
OR
Write short notes on the following 3½+3½=7
Biosynthesis of pyrimidines
Synthesis of starch
2. Write an explanatory note on the mechanism of enzyme action. 7
OR
Briefly describe the following 3½+3½=7
Secondary structure of proteins
Coenzymes
BOT/VI/11/515 3 Contd.
3. Describe the mode of action of auxins. 7
OR
Write short notes on the biosynthesis 3½+3½=7
Cytokinin
Ethylene
4. Explain the ATPase chemiosmotic theory of ATP synthesis. 7
OR
Write short notes on the following 3½+3½=7
Photosystem
C2 cycle
5. Describe the law of thermodynamics. 7
OR
Write short notes on the following 3½+3½=7
Free energy
Enthalpy change