Biomolecules Test

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Biomolecules Test - 28

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statements is not correct?

A
Proteins are polyamides formed from amino acids

B
Except glycine, all other amino acids show optical activity

C
Natural proteins are commonly made up of L-isomer of amino acids

D
In $$\alpha-$$ amino acids, $$-{NH}_{2}$$ and $$-COOH$$ groups are attached to different carbon atoms

Solution

$$\alpha$$-amino acids are the amino acids which has the amino and carboxyl groups attached to the same carbon atom, usually has an l-configuration, and is the chemical constituent of a protein.
Hence D is incorrect.
Question 2
1 / -0

Vitamin A is present in ?

A
fish liver oil

B
milk

C
butter

D
all of these

Solution

Vitamin A is present in liver, milk, green and yellow vegetables and yellow fruits, such as broccoli, spinach, turnip greens, carrots, squash, sweet potatoes, pumpkin, apricots, cod liver oil and in animal sources such as liver, milk, butter, cheese, and whole eggs etc.

Hence, the correct option is D.
Question 3
1 / -0

Starch is composed of two polysaccharides which are:

A
amylopectin and glycogen.

B
amylose and glycogen.

C
amylose and amylopectin.

D
cellulose and glycogen.

Solution

amylose and amylopectin
Amylose and Amylopectin are polysaccharides of starch.
Question 4
1 / -0

The light coming from the sun is stored as energy in plants by the process of photosynthesis. This happens by converting carbon dioxide and water into:

A
green leaves

B
carbohydrates

C
fats

D
plants hormones

Solution

Photosynthesis is the process by which plants utilize the energy from the sunlight in order to convert carbon dioxide and water into carbohydrates.
Question 5
1 / -0

When sugar is treated with sulphuric acid, we get a very pure form of:

A
carbon

B
oxygen

C
water

D
hydrogen

Solution

(A) carbon
Concentrated sulphuric acid is a strong dehydrating agent. Sulphuric acid removes water from organic compounds; it is evident by its charring action on carbohydrates.
$${C}_{12}{H}_{22}{O}_{11} \xrightarrow{\text{ conc. } {H}_{2}S{O}_{4}} 12C + 11{H}_{2}O$$
Question 6
1 / -0

Sulphur is required in plants, as a nutrient element for:

A
making hormones

B
absorption of water

C
making vitamins

D
absorption of fat

Solution

Plants require sulphur to produce vitamins, amino acids, enzymes, and proteins
Question 7
1 / -0

Which of the following is the correct statement?

A
Starch is a polymer of $$\alpha$$- glucose.

B
Amylose is not a component of starch.

C
Proteins are composed of only one type of amino acid.

D
In cyclic structure of fructose, there are five carbon and one oxygen atoms.

Solution

Starch is a polymer of $$\alpha$$-glucose
When alpha-glucose molecules are joined chemically to form a polymer, starch is formed.
Question 8
1 / -0

Which of the following is an acidic amino acid ?

A
Glycine

B
Valine

C
Leucine

D
Glumatic acid

Solution

Two amino acids have acidic side chains at neutral pH. These are aspartic acid or aspartate (Asp) and glutamic acid or glutamate (Glu). Their side chains have carboxylic acid groups.
Question 9
1 / -0

Among the following essential amino acid is:

A
alanine

B
valine

C
proline

D
serine

Solution

Valine is an essential amino acid which is used in the synthesis of proteins. It consists of a $$\alpha$$-amino group, a $$\alpha$$-carboxyl group, and a side chain isopropyl group, making it a nonpolar amino acid
Question 10
1 / -0

Which one of the following bases is not present in DNA?

A
Thymine

B
Quinoline

C
Adenine

D
Cytosine

Solution

Quinoline is an alkaloid, it is not present in DNA. DNA has four nitrogen bases i.e. adenine (A), guanine (G), cytosine (C) and thymine (T).

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Re-Attempt Weekly Quiz Competition

Biomolecules Test - 28

Result

Biomolecules Test - 28

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SHARING IS CARING

Question 1

Proteins are polyamides formed from amino acids

Except glycine, all other amino acids show optical activity

Natural proteins are commonly made up of L-isomer of amino acids

In $$\alpha-$$ amino acids, $$-{NH}_{2}$$ and $$-COOH$$ groups are attached to different carbon atoms

Solution

Question 2

fish liver oil

milk

butter

all of these

Solution

Question 3

amylopectin and glycogen.

amylose and glycogen.

amylose and amylopectin.

cellulose and glycogen.

Solution

Question 4

green leaves

carbohydrates

fats

plants hormones

Solution

Question 5

carbon

oxygen

water

hydrogen

Solution

Question 6

making hormones

absorption of water

making vitamins

absorption of fat

Solution

Question 7

Starch is a polymer of $$\alpha$$- glucose.

Amylose is not a component of starch.

Proteins are composed of only one type of amino acid.

In cyclic structure of fructose, there are five carbon and one oxygen atoms.

Solution

Question 8

Glycine

Valine

Leucine

Glumatic acid

Solution

Question 9

alanine

valine

proline

serine

Solution

Question 10

Thymine

Quinoline

Adenine

Cytosine

Solution

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