141. Nucleic acids are the polymers of _________.
A
nucleosides
B
nucleotides
C
bases
D
sugars
Answer :
nucleotides
142. Which of the following bases is not present in $$DNA?$$
A
Adenine
B
Thymine
C
Cytosine
D
Uracil
Answer :
Uracil
143. Which of the following is correct about $$H$$ - bonding in nucleotide?
A
$$A - T,\,G - C$$
B
$$A - G,\,T - C$$
C
$$G - T,\,A - C$$
D
$$A - A,\,T - T$$
Answer :
$$A - T,\,G - C$$
144. Vitamin $${B_2},$$ a water soluble vitamin is also known as
A
ascorbic acid
B
riboflavin
C
thiamine
D
pyridoxine
Answer :
riboflavin
145. Globular proteins are present in
A
blood
B
eggs
C
milk
D
all of these
Answer :
all of these
146. Sucrose (cane sugar) is a disaccharide. One molecule of sucrose on hydrolysis gives __________.
A
2 molecules of glucose
B
2 molecules of glucose + 1 molecule of fructose
C
1 molecule of glucose + 1 molecule of fructose
D
2 molecules of fructose
Answer :
1 molecule of glucose + 1 molecule of fructose
147. The pair of compounds in which both the compounds give positive test with Tollen’s reagent is
A
Glucose and Sucrose
B
Fructose and Sucrose
C
Acetophenone and Hexanal
D
Glucose and Fructose
Answer :
Glucose and Fructose
148. Which of the following is not true about amino acids?
A
They are constituents of all proteins.
B
Alanine having one amino and one carboxylic group.
C
Most naturally occurring amino acids have $$D$$ - configuration.
D
Glycine is the only naturally occurring amino acid which is optically inactive.
Answer :
Most naturally occurring amino acids have $$D$$ - configuration.
149. In osazone formation, glucose reacts with three molecules of phenylhydrazine. Which statement is true regarding this ?
A
All the three molecules react in similar fashion
B
Two molecules react in similar manner, while the third reacts in different way
C
All the three molecules react in different ways
D
None of the above is true
Answer :
Two molecules react in similar manner, while the third reacts in different way
