26
MCQ (Multiple Correct Answer)
In fibrous proteins, polypeptide chains are held together by
A
van der Waals forces
B
disulphide linkage
C
electrostatic forces of attraction
D
hydrogen bonds
27
MCQ (Multiple Correct Answer)
Which of the following are purine bases?
A
Guanine
B
Adenine
C
Thymine
D
Uracil
28
MCQ (Multiple Correct Answer)
Which of the following terms are correct about enzyme?
A
Proteins
B
Dinucleotides
C
Nucleic acids
D
Biocatalysts
29
Subjective
Name the sugar present in milk. How many monosaccharide units are present in it? What are such oligosaccharides called?
Explanation
Sugar present in milk is known as lactose sugar. Two units of monosaccharides $\beta$-D-galactose and $\beta$-D-glucose are linked together. Hence, are known as disaccharides.
30
Subjective
How do you explain the presence of all the six carbon atoms in glucose in a straight chain?
Explanation
Glucose on heating with HI produces $n$-hexane.
This suggests that all the six carbon atoms of glucose are linked in a straight chain.