Biomolecules practice · Hard

The incorrect statement regarding enzymes is :

Which of the following statements regarding carbohydrates are correct?

(i) Lactose is the carbohydrate found in milk.

(ii) More than 25 monosaccharides occur naturally.

(ii) Sucrose on hydrolysis gives one molecule each of glucose and fructose.

(iv) Maltose is a non-reducing sugar whereas sucrose is a reducing disaccharide sugar.

Number of cyclic tripeptides formed with 2 amino acids $A$ and $B$ is:

The bonds between Guanine and Cytosine

DNA multiplication is called as

Identify incorrect statement regarding glucose.

Which of the following statements are false regarding the nature of amino acids?

A. The acidity and neutrality of amino acids is based on number of amino and carboxyl groups.

B. Both $\mathrm{NH}_2$ and $\mathrm{COOH}$ groups of amino acids show ionizable nature.

C. In solutions of different $\mathrm{pH}$, the structure of amino acids does not change.

D. The amino acids have amino group and aldehyde group as substituents on the same carbon.

DNA and RNA are different molecules as:

Assertion: Less intake of iodine in diet leads to enlargement of thyroid gland

Reason: iodine deficiency leads to hyperthyroidism.

The optical rotation of $\alpha-\mathrm{D}$ fructose is $-21^{\circ}$ and that of its $\beta$-form is $-133^{\circ}$. The equilibrium mixture of these anomers has an optical rotation of $-92^{\circ}$. What is the $\%$ of $\alpha$-form (upto one decimal place) in its equilibrium mixture?

Which one of the following compounds is found abudnantly in nature?

Which of the following is not a broad-spectrum antibiotic?

The strongest form of intermolecular bonding that could be formed involving the residue of the amino acid valine is

Identify correct conversion during acidic hydrolysis from the following:

(A) starch gives galactose.

(B) cane sugar gives equal amount of glucose and fructose.

(C) milk sugar gives glucose and galactose.

(D) amylopectin gives glucose and fructose.

(E) amylose gives only glucose.

Choose the correct answer from the options given below:

Simplest amino acid is :

Assertion : DNA as well as RNA molecules are found in the nucleus of a cell.

Reason: On heating, the enzymes do not lose their specific activity.

Assertion (A): Activation energy for the acid catalysed hydrolysis of sucrose is $6.22 \mathrm{~kJ} \mathrm{~mol}^{-1}$, while the activation energy is only $2.15 \mathrm{~kJ} \mathrm{~mol}^{-1}$. When hydrolysis is catalysed by the enzyme sucrose.

Reason (R): Enzymes the biocatalysts, reduce the magnitude of activation energy by providing the alternative path. In the hydrolysis of sucrose the enzyme sucrose reduces the activation energy from $6.22 \mathrm{~kJ} \mathrm{~mol}^{-1}$ to $2.15 \mathrm{~kJ} \mathrm{~mol}^{-1}$.

Which of the following statement is correct about fructose?