Q1 · 2005-2022 · 2 marks
Match the isoelectric point with the amino acids. Amino acids Isoelectric point (X) \mathrm{H_2NCH_2COOH} (I) 9.5 (Y) \mathrm{HOOCCH_2CH_2CH(NH_2)COOH} (II) 6.0 (Z) \mathrm{H_2N(CH_2)_4CH(NH_2)COOH} (III) 3.1
- (a) (X)-(II), (Y)-(III), (Z)-(I)
- (b) (X)-(III), (Y)-(I), (Z)-(II)
- (c) (X)-(I), (Y)-(II), (Z)-(III)
- (d) (X)-(II), (Y)-(I), (Z)-(III) IIT JAM 2006
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Answer: (a)
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Q2 · 2005-2022 · 2 marks
The complementary strand of DNA for the following single stranded DNA sequence, 5′–A–T–C–A–T–G–C–3′ is
- (a) 5′–A–T–C–A–T–G–C–3′
- (b) 5′–T–A–G–T–A–C–G–3′
- (c) 5′–G–C–A–T–G–A–T–3′
- (d) 5′–C–G–T–A–C–T–A–3′
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Answer: (c)
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Q3 · 2005-2022 · 2 marks
The structure of D-galactose is 
Which one of these structures is L-galactose? Show answer
Answer: (d)
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Q4 · 2005-2022 · 2 marks
Calculate the isoelectric point (p.I.) of lysine, given the \mathrm{p}K_a of \alpha.\mathrm{NH_3} is 8.95, \mathrm{p}K_a of side chain \mathrm{NH_3} is 10.53 and \mathrm{p}K_a of \alpha.COOH is 2.18.
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Answer: 9.74
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Q5 · 2005-2022 · 2 marks
The absolute configurations at the two chiral centers in D-Ribulose are D-Ribulose
- (a) 3R, 4R
- (b) 3 \mathrm{R}, 4 \mathrm{~S}
- (c)
3 \mathrm{~S}, 4 \mathrm{R} - (d) 3 \mathrm{~S}, 4 \mathrm{~S}
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Answer: (a)
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Q6 · 2005-2022 · 2 marks
The correct relationship within each pair of the natural products is:
- (a) Camphor - terpene; insulin - protein; nicotine - alkaloids; streptomycin - carbohydrate
- (b) Camphor - terpene; insulin - carbohydrate; nicotine - alkaloid; streptomycin - lipid
- (c) Camphor-alkaloid; insulin-protein; nicotine-terpene; streptomycin-carbohydrate.
- (d) Camphor - carbohydrate; insulin - protein; nicotine - alkaloid; streptomycin - terpene.
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Answer: (a)
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Q7 · 2005-2022 · 2 marks
The Haworth projection for \alpha-anomer of D-glucose is
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Answer: (c)
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Q8 · 2005-2022 · 2 marks
The complementary DNA sequence of the given DNA 5'-G-A-A-T-T-C-3' is:
- (a) 5'-C-T-T-A-A-G-3'
- (b) 5'-C-U-U-A-A-G-3'
- (c) 3'-C-T-T-A-A-G-5'
- (d) 3'-G-A-A-T-T-C-5'
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Answer: (c)
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Q9 · 2005-2022 · 2 marks
\alpha-Farnesene shown below is a
- (a)
diterpene having two isoprene units - (b) triterpene having three isoprene units
- (c) triterpene having four isoprene units
- (d) Sesquiterpene having three isoprene units.
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Answer: (d)
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Q10 · 2005-2022 · 2 marks
Which one of the following statements is Correct?
- (a) Naturally occuring DNA has \beta-configuration.
- (b) Nucleic acids are derived from proteins.
- (c) Proteins store genetic information
- (d) Vitamins generally act as enzymes IIT JAM 2014
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Answer: (a)
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Q11 · 2005-2022 · 2 marks
Tollen's test will be negative for: 
- (a) Glucose
- (b) Mannose
- (c) Sucrose
- (d) Galactose
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Answer: (c)
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Q12 · 2005-2022 · 2 marks
The \mathrm{pK_a} values of lysine are 2.18, 8.95 and 10.79. The isoelectric point of lysine is ____ IIT JAM 2016
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Answer: 9.87
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Q13 · 2005-2022 · 2 marks
The most basic amino acid among the following is
- (a) tyrosine
- (b) methionine
- (c) arginine
- (d) glutamine
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Answer: (c)
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Q14 · 2005-2022 · 2 marks
The maximum number of dipeptides that could be obtained by reaction of phenylalanine with leucine is ____
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Answer: 2
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Q15 · 2005-2022 · 2 marks
The number of reducing sugars among the following is ____ 
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Answer: 3
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Q16 · 2005-2022 · 2 marks
The C-2 epimer of D-glucose is
- (a) D-Mannose
- (b) D-Fructose
- (c) D-Galactose
- (d) D-Gulose
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Answer: (a)
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Q17 · 2005-2022 · 2 marks
Based on the information given below, the isoelectric point (pI) of lysine is ____ (Round off to one decimal place) 
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Answer: 9.8
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Q18 · 2005-2022 · 2 marks
The amino acid R configuration is
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Answer: (b)
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Q19 · 2005-2022 · 2 marks
The nucleobase NOT found DNA is
- (a) Thymine
- (b) Uracil
- (c) Guanine
- (d) Adenine
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Answer: (b)
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