Biomolecules

In a protein molecule various amino acids are linked together by

• β-glycosidic bond

• peptide bond

• dative bond

• dative bond

Which of the following statement is false?

• Ca²⁺ ions are important in blood clotting

• Ca²⁺ ions are not important in maintaining the regular beating of the heart.

• Mg²⁺ ions are important in the green parts of plants

• Mg²⁺ ions are important in the green parts of plants

The correct statement regarding RNA and DNA, respectively is

• The sugar component in RNA is ribose and sugar component in DNA is 2' deoxyribose

• The sugar component in RNA is arabinose and the sugar component in DNA is ribose

• The sugar component in RNA is 2'-deoxyribose and the sugar component in DNA is arabinose

• The sugar component in RNA is 2'-deoxyribose and the sugar component in DNA is arabinose

Which one given below is a non - reducing sugar?

• Lactose

• Glucose

• Sucrose

• Sucrose

The function of 'sodium pump' is a biological process operating in each and every cell of all animal. Which of the following biologically important ions is also a constituent of this pump?

• Ca²⁺

• Mg²⁺

• K⁺

• Fe²⁺

D-(+)- glucose reacts with hydroxylamine and yields an oxime. The structure of the oxime.The structure of the oxime would be

Which one of the following statement is incorrect about enzyme catalysis?

• Enzymes are mostly proteinous in nature

• Enzyme action is specific

• Enzymes are denaturated by ultraviolet rays and at high temperature

• Enzymes are denaturated by ultraviolet rays and at high temperature

Deficiency of vitamin B₁ causes the disease

• convulsions

• beri-beri

• cheilosis

• cheilosis

Which one of the following sets of monosaccharides forms sucrose?

• α-D-galactopyranose and α-D- glucopyranose
• α-D-glucopyranose and β-D-fructofuranose
• β-D-glucopyranose and α-D-fructofuranose
• β-D-glucopyranose and α-D-fructofuranose

Which one of the following statements is not true regarding (+) lactose?

• (+) lactose is a  β - glycoside formed by the union of a molecule of D (+) galactose

• (+) lactose is a reducing sugar and does not exhibit mutarotation

• (+) lactose, C₁₂H₂₂O₁₁ contains 8 - OH groups

• (+) lactose, C₁₂H₂₂O₁₁ contains 8 - OH groups