Practice Start Test

Biomolecules

NEET Biology · 137 questions · Page 11 of 14 · Click an option or "Show Solution" to reveal answer

Q101
Which one is responsible for production of energy in bio-reaction?
A Thyroxine
B Adrenaline
C Oestrogen
D Progesterone
Correct Answer
Option A
Solution

It is a hormone secreted from thyroid gland.

It controls various biochemical reactions involving burning of proteins, carbohydrates, fats to release energy.

Q102
Which of the given statements is INCORRECT about glycogen?
A It is a straight chain polymer similar to amylose
B It is present in animal cells
C It is present in some yeast and fungi
D Only α\alpha -linkages are present in the molecule
Correct Answer
Option A
Solution

Glycogen is branch chain polymer.

Q103
The two functional groups present in a typical carbohydrate are
A -OH and -COOH
B -CHO and -COOH
C > C = O and - OH
D - OH and -CHO
Correct Answer
Option D
Solution

NOTE : Glucose is considered as a typical carbohydrate which contains

−CHO-CHO

and

−OH-OH

group.

Q104
Glucose and Galactose are having identical configuration in all the positions except position
A C–5
B C–3
C C–2
D C–4
Correct Answer
Option D
Solution

Glucose and galactose differs in configuration on C4.

Q105
Fructose is an example of :
A Heptose
B Pyranose
C Ketohexose
D Aldohexose
Correct Answer
Option C
Solution

Fructose contains ketone group so it is ketose.

Q106
Sugar moiety in DNA and RNA molecules respectively are
A β\beta-D-2-deoxyribose, β\beta-D-deoxyribose.
B β\beta-D-2-deoxyribose, β\beta-D-ribose
C β\beta-D-ribose, β\beta-D-2-deoxyribose.
D β\beta-D-deoxyribose, β\beta-D-2-deoxyribose.
Correct Answer
Option B
Solution

DNA contains ⇒\Rightarrow β\beta– D – 2 – deoxyribose RNA contains ⇒\Rightarrow β\beta– D – ribose

Q107
During the denaturation of proteins, which of these structures will remain intact?
A Primary
B Secondary
C Tertiary
D Quaternary
Correct Answer
Option A
Solution

During the denaturation of proteins hydrogen bonds are disturbed.

As a result, the secondary and tertiary structures are destroyed but the primary structures remain intact.

Q108
The α\alpha-Helix and β\beta - Pleated sheet structures of protein are associated with its :
A tertiary structure
B quaternary structure
C primary structure
D secondary structure
Correct Answer
Option D
Solution

α\alpha-helix and β\beta-pleated sheet belongs to secondary structure of protein, which have hydrogen bonds.

Q109
Which of the following statement is not true for glucose?
A Glucose gives Schiff's test for aldehyde
B Glucosse reacts with hydroxylamine to form oxime
C The pentaacetate of glucose does not react with hydroxylamine to give oxime
D Glucose exists in two crystalline forms α\alpha and β\beta
Correct Answer
Option A
Solution

Glucose gives negative test with Schiff reagent.

Q110
Identify the incorrect statement from the following
A Amylose is a branched chain polymer of glucose
B Starch is a polymer of α\alpha-D glucose
C β\beta-Glycosidic linkage makes cellulose polymer
D Glycogen is called as animal starch
Correct Answer
Option A
Solution

Amylose is a linear chain polymer of α\alpha-D-glucose while amylopectine is branched chain polymer of α\alpha-D-glucose.

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