Insulin, a hormone chemically is

1. Fat

2. Steroid

3. Protein

4. Carbohydrates

A dipeptide does not have

1. two peptide units

2. por.tions of two amino acids

3. an amino group

4. salt like structure

Which one of the following is not produced by body?

1. DNA

2. Enzymes

3. Hormones

4. Vitamins

In aqueous solution of amino acids mostly exists in,

1. NH₂-CH(R)-COOH

2. NH₂-CH(R)-COO^-

3. H₃N⁺ -CH(R)-COOH

4. H₃N⁺ - CH(R)-COO^-

Which one of the following rotates the plane polarized light towards left?

1. D( +) Glucose

2. D( +) Glucose

3. D(-) Fructose

4. D( +) Galactose

Proteins are

1. polypeptides

2. polyacids

3. polyphenols

4. polyesters

α - D ( +) Glucose and β-D ( +) glucose are

1. Epimers

2. Anomers

3. Enantiomers

4. Contormational isomers

The number of sp₂ and sp₃ hybridised carbon in fructose are respectively

1. 1 and 4

2. 4 and 2

3. 5 and 1

4. 1 and 5

Glucose ·is an aldose. Which one of the following reactions is not expected with glucose?

1. It does not form oxime

2. It does not react with GrigQard reagent

3. It does not form osazones

4. It does not reduce tollens reagent

Which is not true of amino add?

1. amino acid forms zwitter ion

2. has isoelectric point

3. dual behaviours

4. amino acid is insoluble in NaOH solution

Proteins are not sensitive to

1. acids

2. bases

3. elevated temperature

4. water

Which of the following contains a lipid?

1. Starch

2. Mineral oil

3. Edible oil

4. Peptide

Complete hydrolysis of cellulose gives

1. L-Glucose

2. D-Fructose

3. D-Ribose

4. D-Glucose

Glucose (HCN) Product (hydrolysis) Product (HI + Heat) A, the compound A is

1. Heptanoic acid

2. 2-Iodohexane

3. Heptane

4. Heptanol

Sucrose contains glucose and fructose linked by

1. c₁- c₁

2. c_{1 -} c₂

3. c₁ - c₄

4. c₁ - c₆

Sugar is / are

1. sweet

2. crystalline solid

3. soluble in water

4. all the above

Specificity of enzyme is due to

1. the sequence of amino acids

2. secondary structure

3. tertiary structure

4. all of the above

Which of the following statement is correct?

1. Ovalbumin is a simple food reserve in egg white

2. Blood proteins thrombin and fibrinogen are involved in blood clotting

3. Denaturation makes protein more active

4. Insulin maintains the sugar level of in the human body.

The building block of proteins are

1. \(\alpha \) - hydroxy acids

2. \(\alpha \) - amino acids

3. \(\beta \) - hydroxy acids

4. \(\beta \) - amino acids

The central dogma of molecular genetics states that the genetic information flows from

1. Amino acids, Protein, DNA

2. DNA, Carbohydrates, Proteins

3. DNA, RNA, Proteins

4. DNA, RNA, Carbohydrates

Sucrose is not

1. a di-saccharide

2. a non-reducing sugar

3. hydrolysed to only glucose

4. hydrolysed to glucose & fructose

Assertion : A solution of sucrose in water is dextrorotatory. But on hydrolysis in  the presence of little hydrochloric acid, it becomes levorotatory.
Reason : Sucrose' hydrolysis gives unequal amounts of glucose and fructose. As a result of this change in sign of rotation is observed.

1. If both assertion and reason are true and reason is the correct explanation of assertion

2. If both assertion and reason are true but reason is not the correct explanation of assertion

3. If assertion is true but reason is false.

4. If both assertion and reason are false.

Inversion of sucrose refers to

1. oxidation of sucrose

2. reduction of sucrose

3. hydrolysis of sucrose to glucose and fructose

4. polymerisation of sucrose.

Which among the following contains triglyceride ?

1. Wax

2. Cooking oil

3. Essential oil

4. Albumin

Vitamin B₂ is also known as

1. Riboflavin

2. Thiamine

3. Nicotinamide

4. Pyridoxine

The oxide bridges through which a large number of monosaccharide units are linked in polysaccharides are called

1. peptide bond

2. hydrogen bond

3. nitrogen bond

4. glycosidic linkage

The secondary structure of a protein refers to

1. fixed configuration of the polypeptide backbone

2. hydrophobic interaction

3. sequence of a -amino acids

4. α - helical backbone

Which contains a long chain ester ?

1. Wax

2. Cooking oil

3. Turpentine oil

4. Cellulose

Which of the following are epimers

1. D( +)-Glucose and D( +)-Galactose

2. D( +)-Glucose and D(+)-Mannose

3. Neither (a) nor (b)

4. Both (a) and (b)

Disaccharides have general formula

1. C_n(H₂O)_n

2. (CO₂)_nH_n

3. Cn(H₂O)_n-1

4. Cn(H₂O)_2n-1

Which is a monosaccharide among the following?

1. Sucrose

2. Cellulose

3. Maltose

4. Glucose

Which of the following vitamins is water soluble?

1. Vitamin E

2. Vitamin K

3. Vitamin A

4. Vitamin B

The amino acid without chiral carbon is

1. Glycine

2. Alanine

3. Proline

4. Tyrosine

Identify the reducing sugar.

1. Sucrose

2. Cellulose

3. Starch

4. Glucose

Denaturation does not involve

1. breaking up of H-bonding in proteins.

2. the loss of biological action of enzyme.

3. the loss of secondary structure.

4. loss of primary structure of proteins

Which among the following is called fruit sugar?

1. Glucose

2. Fructose

3. Sucrose

4. Maltose

Which is not a saturated fatty acid ?

1. Palmitic acid

2. Stearic acid

3. Oleic acid

4. Glyceric acid

Name the base present only in RNA

1. adenine

2. guanine

3. uracil

4. thymine

In a protein, various amino acids linked together by.

1. Peptide bond

2. Dative bond

3. α - Glyco·sidic bond

4. β - Glycosidic bond

The pyrimidine bases present in DNA are

1. Cytosine and Adenine

2. Cytosine and Guanine

3. Cytosine and Thiamine

4. Cytosine and Uracil

What are the functions of lipids in living organism?

Write the Zwitter ion structure of alanine.

Classify the following into monosaccharides, oligosaccharides and polysaccharides.
i) Starch ii) fructose iii) sucrose iv) lactose v) maltose

What type of linkages hold together monomers of DNA?

Give two difference between Hormones and vitamins.

What are hormones? Give examples.

How are vitamins classified?

Why carbohydrates are generally optically active?

Give the differences between primary and secondary structure of proteins.

Name the Vitamins whose deficiency cause, i) rickets ii) scurvy