NCERT Class 11-Biology Exemplar Chapter –9 Biomolecules Part 2
Get unlimited access to the best preparation resource for NSO-Level-2 Class-8: fully solved questions with step-by-step explanation- practice your way to success.
Question 9:
A homopolymer has only one type of building block called monomer repeated ‘n’ number of times. A heteropolymer has more than one type of monomer. Proteins are heteropolymers made of aminoacids. While a nucleic acid like DNA or RNA is made of only 4 types of nucleotide monomers, proteins are made of
a. 20 types of monomers
b. 40 types of monomers
c. 3 types of monomers
d. only one type of monomer
Answer: (a)
Question 10:
Proteins perform many physiological functions. For example, some functions as enzymes. One of the following represents an additional function that some proteins discharge
a. Antibiotics
b. Pigment conferring colour to skin
c. Pigments making colours of flowers
d. Hormones
Answer: (d)
Question 11:
Glycogen is a homopolymer made of
a. Glucose units
b. Galactose units
c. Ribose units
d. Aminoacids
Answer: (a)
Question 12:
The number of ‘ends’ in a glycogen molecule would be
a. Equal to the number of branches plus one
b. Equal to the number of branch points
c. One
d. Two, one on the left side and another on the right side
Answer: (a)
Question 13:
A pure protein should normally have
a. Two ends
b. One end
c. Three ends
d. No ends
Answer: (a)
Question 14:
Enzymes are biocatalysts. They catalyse biochemical reactions. In general they reduce activation energy of reactions. Many physico-chemical processes are enzyme mediated. Some examples of enzyme mediated reactions are given below. Tick the wrong entry
a. Dissolving CO2 in water
b. Untwining the two strands of DNA
c. Hydrolysis of sucrose
d. Formation of peptide bond
Answer: (d)
Very Short Answer Type Questions
Question 1:
Medicines are either man made (i.e., synthetic) or obtained from living organisms like plants, bacteria, animals etc. and hence the latter are called natural products. Sometimes natural products are chemically altered by man to reduce toxicity or side effects. Write against each of the following whether they were initially obtained as a natural product or as a synthetic chemical.
a. Penicillin ___________________________
b. Sulfonamide ___________________________
c. Vitamin C ___________________________
d. Growth Hormone ___________________________
Answer:
A. Penicillin- Natural product (obtained from fungus P. notatum).
B. sulphonamide- Synthetic product
C. Vitamin C- Natural product
D. Growth Hormone- Natural product