Total Marks: 50 (MCQs: 10, Short Answers: 15×2=30, Detailed Answers: 2×5=10)
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Q1. Choose the correct option. (10 Marks, 1 mark each)
1. pH effects biochemical reactions by influencing:
2. High fructose corn syrup is sweeter than sucrose because:
3. ……… level of protein structure is determined solely by amino acid sequence.
4. α-helix & β-pleated sheets are example of ………
5. Insulin is an example of protein with ………
6. ……… protein is correctly paired with its function.
7. What stabilizes the quaternary structure of hemoglobin?
8. Oxygen is transported in muscles by ………
9. The Watson-Crick model of DNA describes it as a:
10. All of the following are examples of conjugated molecules except:
10 multiple choice questions
Q2. Write down short answers of following questions. (30 Marks, 15×2=30)
I Illustrate the formation of phosphodiester bond.
Hint: Phosphodiester bond connects 3′ carbon of one nucleotide to 5′ carbon of next nucleotide, releasing H₂O.
II Why do non-polar substances like oils not dissolve in water?
III Why cellulose is indigestible for most organisms?
IV Differentiate between alpha-D-glucose and beta-D-glucose.
V Name two globular proteins with functions.
VI What is an ester?
VII List five classes of lipids.
VIII Why saturated fatty acids have higher melting points than unsaturated ones?
IX State two biological functions of waxes.
X Describe the amphipathic nature of phospholipids.
XI How do prostaglandins act in the body?
XII Name the three components of nucleotides.
XIII What is central dogma?
XIV What is the function of ATP in a cell?
XV What is the significance of nucleoproteins in eukaryotic cells?
15 short answer questions (2 marks each)
Q3. Write detailed answers of the following questions. (Answer any 2) (10 Marks, 2×5=10)
1. Describe the molecular level structure of nucleotide.
2. Describe the complete structure of a nucleotide and explain how the components differ between DNA and RNA.
3. Describe the roles of ATP and NADP as nucleotide-derived molecules. How do their structures enable them to participate in energy transfer and redox reactions respectively?
3 detailed questions (answer any 2, 5 marks each)
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