Biomolecules Test

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Biomolecules Test - 24

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statements is not correct?

A
Proteins are poly amides formed from aminoacids

B
Except glycine, all other amino acids show optical activity

C
Natural proteins are made up of L isomers of amino acids

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

Solution

(A) Proteins are poly amides formed from alpha amino acids. Thus, the option A is correct.
(B) Except glycine, all other amino acids show optical activity as they contain chiral carbon atom. Glycine is achiral. Thus, option B is correct.
(C) Natural proteins are made up of L isomers of amino acids. Thus, statement C is correct.
(D) In amino acids $$NH_2$$ and COOH groups are attached to same carbon atom.
Thus, the statement D is incorrect.
Question 2
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Which of the following is correct about starch?

A
It is a white cyrstalline powder

B
Coloured amorphous powder

C
It is white-amorphous powder

D
Coloured crystalline compound

Solution

Starchis white-amorphous powder. It a odourless, tasteless, solid carbohydrate, $$(C_6H_{10}O_5)_n$$, occurring in the form of minute granules in the seeds tubers, and other parts of plants, and forming an important constituent of rice, corn, wheat, beans, potatoes and many other vegetable foods. It is used as a thickener or stabilizer.
Question 3
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The non-proteinaceous substance, which certain enzymes require for their activity are called

A
catalysts

B
inhibitors

C
co-enzymes

D
epimers

Solution

The non-proteinaceous substance, which certain enzymes require for their activity are called coenzymes. Coenzymes are organic molecules that are required by certain enzymes to carry out catalysis. They bind to the active site of the enzyme and participate in catalysis but are not considered substrates of the reaction. They function as intermediate carriers of electrons, specific atoms or functional groups that are transferred in the overall reaction. Example: $$FAD$$, $$NAD^+$$, $$TPP$$.
Question 4
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The prosthetic group present in nucleoproteins is

A
nucleic acids

B
lipids

C
carbohydrates

D
phosphoric acid

Solution

The prosthetic group present in nucleoproteins is nucleic acids. Nucleoproteins are proteins of cell nuclei and are main component of chromatin. They are present in every living cell a well as in virus and baceteria. Example -protamines, histones.
Question 5
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The source of retinol (vitamin A) is:

A
liver

B
kidney

C
fish oils

D
all the above

Solution

The source of retinol (vitamin $$ A$$ ) are liver kidney and fish oil. Retinol is that form of vitamin $$A$$ which is obtained from animal sources. Vitamin $$A$$ comes from two sources. One group comes from animal sources and is called retinoids, which includes retinol. The other group comes from plants and is called carotenoids, which includes beta-carotene. The body converts beta-carotene to vitamin $$A$$.
Question 6
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On hydrolysis of starch, we finally get:

A
glucose and fructose

B
glucose

C
fructose

D
sucrose

Solution

On hydrolysis of starch, we finally get glucose. This is because starch is the polymer of glucose. The reaction takes place in presence of amylase enzymes.
$$\underset{\begin{matrix}starch\, or\\cellulose\end{matrix}}{(C_6H_{10}O_5)_n} + nH_2O \xrightarrow[\begin{matrix} 393K\\2-3 \,bars\end{matrix}]{H^+} \underset{glu\,cose}{nC_6H_{12}O_6}$$
Question 7
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Which of the following is not an attribute of enzymes?

A
They are proteinaceous in nature.

B
They speed up the rate of biochemical reactions.

C
They are specific in nature.

D
They are used up in reactions.

Solution

Enzymes are biological catalysts. They are proteinaceous substances that are capable of catalysing chemical reactions of biological systems without themselves undergoing any change.
So, the correct answer is 'They are used up in reactions.'
Question 8
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Enzymes are polymers of

A
Hexose carbon

B
Fatty acids

C
Amino acids

D
Inorganic phosphate

Solution

Most of the enzymes, except for a few ribozymes, are proteinaceous in nature. Proteins are biopolymers of amino acids. Hence, enzymes are polymers of amino acids.
So, the correct answer is 'Amino acids'
Question 9
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Transition state structure of the substate formed during an enzymatic reaction is

A
Transient but stable

B
Permanent but unstable

C
Transient and unstable

D
Permanent and stable

Solution

Transition state is intermediate state produced during enzymatic biochemical reaction which is transition state and unstable state
Question 10
1 / -0

An example of water soluble vitamin is:

A
vitamin D

B
vitamin E

C
vitamin A

D
vitamin C

Solution

Vitamin $$C$$ is water soluble vitamin.

Vitamin $$D, E, A$$ are fat soluble vitamins.

Vitamins are classified as either fat soluble (vitamins $$A, D, E$$ and $$K$$) or water soluble (vitamins $$B$$ and $$C$$).

The fat soluble vitamins are soluble in lipids (fats). These vitamins are usually absorbed in fat globules by the small intestines and into the general blood circulation within the body. While water soluble vitamins are directly absorbed by the body.

Option D is correct.

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Biomolecules Test - 24

Result

Biomolecules Test - 24

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Rank

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SHARING IS CARING

Question 1

Proteins are poly amides formed from aminoacids

Except glycine, all other amino acids show optical activity

Natural proteins are made up of L isomers of amino acids

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

Solution

Question 2

It is a white cyrstalline powder

Coloured amorphous powder

It is white-amorphous powder

Coloured crystalline compound

Solution

Question 3

catalysts

inhibitors

co-enzymes

epimers

Solution

Question 4

nucleic acids

lipids

carbohydrates

phosphoric acid

Solution

Question 5

liver

kidney

fish oils

all the above

Solution

Question 6

glucose and fructose

glucose

fructose

sucrose

Solution

Question 7

They are proteinaceous in nature.

They speed up the rate of biochemical reactions.

They are specific in nature.

They are used up in reactions.

Solution

Question 8

Hexose carbon

Fatty acids

Amino acids

Inorganic phosphate

Solution

Question 9

Transient but stable

Permanent but unstable

Transient and unstable

Permanent and stable

Solution

Question 10

vitamin D

vitamin E

vitamin A

vitamin C

Solution

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