The secondary structure of a protein refers to 

• α-helical backbone 

•  hydrophobic interactions

• sequence of α-amino acids

• sequence of α-amino acids

The term anomers of glucose refers to

• isomers of glucose that differ in configurations at carbons one and four (C-1 and C-4)

• a mixture of (D)-glucose and (L)-glucose

• enantiomers of glucose

• enantiomers of glucose

The pyrimidine bases present in DNA are

• cytosine and adenine

• cytosine and guanine

• cytosine and thymine

• cytosine and thymine

In both DNA and RNA, heterocyclic base and phosphate ester linkages are at

•  respectively of the sugar molecule
•  respectively of the sugar molecule
• 
• 

Which base is present in RNA but not in DNA?

• Uracil

• Thymine

• Guanine

• Guanine

Insulin production and its action in the human body are responsible for the level of diabetes. This compound belongs to which of the following categories?

• A co- enzyme

• An antibiotic

• A hormone

• A hormone

Glucose on prolonged heating with HI gives

• 6-iodohexanal

• n-Hexane

• 1-Hexene

• Hexanoic acid

ADP and ATP differ in the number of

• phosphate units

• ribose units

• adenine base

• nitrogen atom

The number of amino acids and number of peptide bonds in a linear tetrapeptide (made of different amino acids) are respectively.

• 4 and 4

• 5 and 5

• 5 and 4

• 4 and 3

In DNA, the consecutive deoxynucleotides are connected via

• phosphodiester linkage

• phosphomonoester linkage

• phosphotriester linkage

• amide linkage