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In a chemical reaction, enzymes catalyze the reaction by:-

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Important Questions on Biomolecules

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Practice Book for KVPY Aptitude Test - Stream SA Biology>Chapter 9 - Biomolecules>KVPY PREVIOUS YEAR QUESTIONS>Q 26
Which ONE of the following coenzymes is required for the conversion of L-alanine to a racemic mixture of D-and L-alanine?
HARD
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Practice Book for KVPY Aptitude Test - Stream SA Biology>Chapter 9 - Biomolecules>KVPY PREVIOUS YEAR QUESTIONS>Q 27
How many different proteins consisting of 100 amino acids can be formed from 20 different amino acids?
HARD
KVPY Aptitude Test - Stream SA
IMPORTANT
Practice Book for KVPY Aptitude Test - Stream SA Biology>Chapter 9 - Biomolecules>KVPY PREVIOUS YEAR QUESTIONS>Q 28

Choose the CORRECT combination of statements given below related to cysteine residue in proteins.

i. Cysteine can be linked to tyrosine by S-O bond.
ii. Cysteine can be linked to another cysteine by S-S bond.
iii. Cysteine can complex with Zn2+
iv. Cysteine can be linked to methionine by S-S bond.

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KVPY Aptitude Test - Stream SA
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Practice Book for KVPY Aptitude Test - Stream SA Biology>Chapter 9 - Biomolecules>KVPY PREVIOUS YEAR QUESTIONS>Q 29
Which ONE of the following is a hetero-polysaccharide?
MEDIUM
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Practice Book for KVPY Aptitude Test - Stream SA Biology>Chapter 9 - Biomolecules>KVPY PREVIOUS YEAR QUESTIONS>Q 32

Match the enzymes in column - I with their respective biochemical reactions in column II. Choose the CORRECT combination from below. 

  Column i    Column ii 
P Transaminases acid I Removal of a phosphoryl group from a specific amino acid.
Q Protein Kinase acid II Removal of an α- amino group from a specific amino acid.
R Protein acid III Addition of phosphoryl group to a specific amino acid.
S Dehydrogenases IV Interconversion of optical isomers.
    V Oxidation and reduction of substrates.

 

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Practice Book for KVPY Aptitude Test - Stream SA Biology>Chapter 9 - Biomolecules>KVPY PREVIOUS YEAR QUESTIONS>Q 33
Which ONE of the following molecules is a secondary metabolite?
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KVPY Aptitude Test - Stream SA
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Practice Book for KVPY Aptitude Test - Stream SA Biology>Chapter 9 - Biomolecules>KVPY PREVIOUS YEAR QUESTIONS>Q 34
Lecithin is a 
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KVPY Aptitude Test - Stream SA
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Practice Book for KVPY Aptitude Test - Stream SA Biology>Chapter 9 - Biomolecules>KVPY PREVIOUS YEAR QUESTIONS>Q 35
Which one of the following combinations of biomolecules is present in the ribosomes?