Biomolecules

Which is not a true statement?

1. -carbon of -amino acid is asymmetric
2. All proteins are found in L-form
3. Human body can synthesise all proteins it needs
4. At pH = 7, both amino and carboxylic groups exist in ionised form

Cellulose is polymer of

1. glucose
2. fructose
3. ribose
4. sucrose

Which of the following give positive Fehling solution test?

1. Sucrose
2. Glucose
3. Fats
4. Protein

Which of the following is correct about H-bonding in nucleotide?

1. A-T, G-C
2. A-G, T-C
3. G-T, A-C
4. A-A, T-T

Which of the following is correct?

1. Cycloheptane is an aromatic compound.
2. Diastase is an enzyme
3. Acetophenone is an ether.
4. All of these.

Which is the correct statement?

1. Starch is a polymer of -glucose.
2. Amylose is a component of cellulose.
3. Proteins are composed of only one type of amino acid.
4. In cyclic structure of fructose, there are four carbons and one oxygen atom.

[figure] Which statement is incorrect about peptide bond?

1. C-N bond length in proteins is longer than usual bond length of N-C bond.
2. Spectroscopic analysis shows planar structure of [figure] group.
3. C-N bond length in proteins is smaller than usual bond length of C-N bond.
4. None of the above.

-D-glucose and -D-glucose are

1. epimers
2. anomers
3. enantiomers
4. diastereomers

Which one is responsible for production of energy in bio-reaction?

1. Thyroxine
2. Adrenaline
3. Oestrogen
4. Progesterone

How do enzymes increase the rate of reactions?

1. by lowering activation energy
2. by increasing activation energy
3. by changing equilibrium constant
4. by forming enzyme substrate complex.