Biomolecules - Organic Chemistry - Chemistry Previous Year Questions

The amount of sucrose needed to produce 1 mole of glucose using acid hydrolysis is

Assertion (A) The denaturation of proteins can destroy all $1^{\circ}, 2^{\circ}$ and $3^{\circ}$ protein structures.

Reason (R) Curdling of milk is due to denaturation of proteins.

The correct option among the following is

The functional group present in asparagine, a non-essential amino acid, are

A vitamin $X$ is soluble in fat and its source is egg yolk. Deficiency of $X$ causes the disease

$$\text { The Haworth projection shown below represents }$$

From the following, the correct statements about polysaccharides are

I. Starch is a polymer of $\alpha-\mathrm{D}(+)$-glucose.

II. Amylose component of starch is not soluble in water.

III. Amylose is a branched chain polymer of $\alpha-\mathrm{D}(+)$-glucose.

IV. Cellulose is a straight chain polymer of $\beta-\mathrm{D}(+)$-glucose units.

The deficiency of which vitamin causes pernicious anaemia?

$$\text { Choose the correct Zwitter ionic form for aspartic acid. }$$

Amino acids containing heterocyclic ring are

(i) Histidine

(ii) Valine

(iii) Arginine

(iv) Proline

Assertion (A) Both glucose and fructose have the same $D$-configuration.

Reason (R) Both glucose and fructose are dextrorotatory.

The correct option among the following is

Assertion (A) In aqueous solution, amino acids exist in dipolar ion form.

Reason (R) Most of the naturally occurring amino acids have $L$-configuration.

The correct option among the following is

$$\text { Consider the following structures }$$

Which of the pairs represent $D$ and $L$-fructose, respectively?

Xerophthalmia disease is caused by the deficiency of

Which of the following are reducing sugars?

I. Sucrose

III. Lactose

II. Ribose

IV. Fructose

Considering the facts that

I. sucrose forms glycosidic linkage between $\mathrm{C}_1$ of glucose and $\mathrm{C}_2$ fructose, while

II. lactose forms glycosidic linkage between $\mathrm{C}_1$ of galactose and $\mathrm{C}_4$ of glucose.

Choose the correct statement.

154. Which of the following statements support the cyclic form for glucose?

(i) It doesn't give Schiff's test.

(ii) It is found to exist in two different crystalline forms.

(iii) It oxidises with nitric acid to give saccharic acid.

(iv) Pentaacetate of glucose doesn't react with hydroxylamine.