Biomolecules Test

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Biomolecules Test - 52

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Weekly Quiz Competition

Question 1
1 / -0

Iodine gives blue colour with:

A
glucose

B
lactose

C
starch

D
heparin

Solution

Iodine gives a blue colour with starch.

The iodine test is used to test for the presence of starch. Starch turns into an intense "blue-black" colour upon addition of aqueous solutions of the triiodide anion, due to the formation of an intermolecular charge-transfer complex.
Question 2
1 / -0

The prosthetic group present in nucleoprotein is __________ .

A
carbohydrate

B
lipid

C
nucleic acid

D
none of the above
Solution
Prosthetic group present in nucleoprotein is nucleic acid,
Prosthetic group:-
A prosthetic group is a tightly bound, specific non-polypeptide unit required for the biological function of some proteins.
The prosthetic group may be organic (such as a vitamin, sugar, or lipid) or inorganic (such as a metal ion), but is not composed of amino acids.
Question 3
1 / -0

Starch is composed of amylose and ________ .

A
amylopectin

B
maltose

C
glycogen

D
none of the above

Solution

Starch has two types of units, Amylose and amylopectin.
Amylose-Amylose is a polysaccharide made of $$\alpha$$-D-glucose units, bonded to each other through $$\alpha(1,4)$$ glycosidic bonds.
Amylopectin- Amylopectin is a water-soluble polysaccharide and highly branched polymer of α-glucose units found in plants
Question 4
1 / -0

The simplest amino acid is _________ .

A
alanine

B
glycine

C
lysine

D
valine

Solution

The simplest amino acid is glycine,
Glycine is an amino acid, a building block for protein. It is not considered an "essential amino acid" because the body can make it from other chemicals.
Question 5
1 / -0

What is the functional group present in tryptophan?

A
alcohol

B
amino acid

C
aldehydes

D
ketone

Solution

The functional group present in tryptophan is amino acid.
Question 6
1 / -0

Vitamin $$B_1$$ is:

A
riboflavin

B
ascorbic acid

C
cobalamin

D
thiamine

Solution

Thiamine is also known as vitamin B₁. It is found in food and used as a dietary supplement to treat and prevent thiamine deficiency and disorders that result from it, including beriberi, Korsakoff's syndrome, and Korsakoff's psychosis.
Question 7
1 / -0

Starch is converted to maltose by the enzyme _______ .

A
lipase

B
protease

C
amylase

D
none of the above

Solution

Amylase reaction on starch:-
Amylase is found in our saliva and is responsible for starting to break down the starch that we eat. So amylase is an enzyme that carries out the specific reaction of breaking down starch into a simple sugar.
Question 8
1 / -0

Lysine is _____________.

A
Neutral amino acid

B
Acidic amino acid

C
Basic amino acid

D
Heterocyclic amino acid

Solution

Ammonia and amines are basic because the nitrogen has an unshared electron pair that can accept a $$H^+$$ more readily that water does.

They will even, to some extent, take a $$H^+$$ from water, leaving a hydroxide $$(OH^{-})$$ ion.

Lysine has an amino group on its side chain, giving it a basic character.

Hence the correct option is C.
Question 9
1 / -0

Hormones are secreted by ductless glands of human body. Iodine containing hormone is:

A
testosterone

B
adrenaline

C
thyroxine

D
insulin

Solution

Hormones are secreted by ductless glands of human body.

Iodine containing hormone is thyroxine. It is secreted by thyroid gland. It is an alpha amino acid. It contains iodine atoms. Its deficiency causes goitre.

Option C is correct.
Question 10
1 / -0

Which of the following amino acids is basic in nature?

A
Valine

B
Tyrosine

C
Arginine

D
Leucine

Solution

In image arginine is shown as above

There are three amino acids that have basic side chains at neutral pH. These are arginine, lysine, and histidine. Their side chains contain nitrogen and resemble ammonia, which is a base.
Their pKa's are high enough that they tend to bind protons, gaining a positive charge in the process.
So, arginine is basic amino acid.