Biomolecules Test

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Biomolecules Test - 33

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Weekly Quiz Competition

Question 1
1 / -0

As temperature changes from 3$$^o$$celsius to 45$$^o$$celsius, the rate of enzyme activity will

A
Decrease and then increase

B
Increase and then decrease

C
Increase only

D
Decrease only

Solution

Enzymes are biological catalysts active in a narrow range of temperature. Enzymes are usually inactive at very low or high temperatures. Consequently, at around 3$$^o$$C enzyme will be inactive as the temperature is increased gradually, the enzyme activity will rise and usually show maximum activity around 30$$^o$$C. If the temperature continues to rise, again the enzyme activity will decline. When the temperature is low or high, there is a distortion of the chemical bonds which changes the active structure of the enzyme making them inactive.
Thus, the correct answer is option B.
Question 2
1 / -0

Which one of the following enzyme contains 'Mo' as prosthetic group?

A
Phosphatase

B
Dehydrogenase

C
Isomerase

D
Nitrate reductase

Solution

The prosthetic group refers to the cofactor that is tightly or covalently bound to an enzyme molecule. Molybdenum is required as a prosthetic group by nitrate reductase (NR) enzyme. The molybdenum is an obligate requirement for the activity of NR enzyme. NR in higher plants is supposed to be a homo-dimer, with two identical subunits joined and held together by the molybdenum cofactor.
So, the correct answer is option D.
Question 3
1 / -0

Genetic code of nucleic acid depends upon

A
Number of nucleic acid

B
Position of nucleic acid

C
Sequence of nucleic acid

D
All the above

Solution

C. Sequence of nucleic acid
Solution: The sequence in which the nucleic acids are arranged in a gene or DNA is the genetic code of that organism or cell,
So the correct answer is " Sequence of nucleic acid".
Question 4
1 / -0

The chemical nature of

chromatin is

A
Nucleic acids

B
Nucleic acids & histone proteins

C
Nucleic acids, histone & non histone proteins

D
Nucleic acids & non- histone proteins

Solution

Most of the DNA of the eukaryotic cell is concentrated in the nucleus as chromatin material as the complex with histone proteins. Chromatin is a fibrous heredity material formed by DNA-histone complex (nucleosome) with some non-histone protein. Histone proteins are required to package DNA inside the eukaryotic nucleus.
Thus, the correct answer is option C.
Question 5
1 / -0

Enzymes which act similarly are called as

A
Isoenzyme

B
Cofactor

C
Coenzymes

D
All of the above

Solution

Isoenzymes are enzymes that catalyze identical chemical reactions but are composed of different amino acid sequences. They are sometimes referred to as isozymes. Isoenzymes are produced by different genes. They occur in many tissues throughout the body and are important for different developmental and metabolic processes. Alkaline phosphatase (ALP) and lactate dehydrogenase (LDH) are examples of isoenzymes.
Question 6
1 / -0

When ATP molecules is hydrolysed in ADP, then the quantity of energy released is about

A
120 cal

B
1,200 cal

C
12,000 cal

D
1,20,000 cal
Question 7
1 / -0

............ is used as a substrate in protoplasmic respiration.

A
Fat

B
Carbohydrate

C
Protein

D
All of the above

Solution

The organic substances, which are catabolised in the living cells to release energy are called as respiratory substrates. Though any food stuff - carbohydrate, fat or protein may act as a respiratory substrate, the common respiratory substrate is glucose. When proteins are used as respiratory fuels, it is called as protoplasmic respiration.
Question 8
1 / -0

Enzymes are found in all living cells. Their main function is

A
To help in the digestion of food

B
To allow chemical reaction to food

C
To speed up the breakdown of substance

D
To accelerate the rate of chemical reactions

E
To help in making new compounds

Solution

Enzymes are biocatalyst produced by living cells that is capable of speeding up specific chemical reaction.
Question 9
1 / -0

In human percent of body weight of carbohydrates, lipids and proteins respectively are ________.

A
1, 15, 17

B
15, 17, 7

C
7, 17, 15

D
17, 15, 7

Solution

A. 1,15,17
Solution : The body weight of the humans have around 1 percent carbohydrates , 15 percent lipids and 17 percent proteins.
So the correct answer is "1,15,17".
Question 10
1 / -0

Assimilatory power refers to the

A
Generation of ATP and NADPH$$_{2}$$

B
Reduction of CO$$_{2}$$

C
Splitting of water

D
Disintegration of plastids

Solution

Light reaction of photosynthesis produces ATP and NADPH$$_2$$ which in turn serve as energy source for fixation of carbon into organic compounds via assimilatory reactions of the calvin cycle in the absence of light i.e., the dark reaction of photosynthesis. Thus, the chemical energy of ATP and reducing energy of NADPH$$_2$$ is known as assimilatory power. Hence, the correct answer is option A.

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Biomolecules Test - 33

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Biomolecules Test - 33

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SHARING IS CARING

Question 1

Decrease and then increase

Increase and then decrease

Increase only

Decrease only

Solution

Question 2

Phosphatase

Dehydrogenase

Isomerase

Nitrate reductase

Solution

Question 3

Number of nucleic acid

Position of nucleic acid

Sequence of nucleic acid

All the above

Solution

Question 4

Nucleic acids

Nucleic acids & histone proteins

Nucleic acids, histone & non histone proteins

Nucleic acids & non- histone proteins

Solution

Question 5

Isoenzyme

Cofactor

Coenzymes

All of the above

Solution

Question 6

120 cal

1,200 cal

12,000 cal

1,20,000 cal

Question 7

Fat

Carbohydrate

Protein

All of the above

Solution

Question 8

To help in the digestion of food

To allow chemical reaction to food

To speed up the breakdown of substance

To accelerate the rate of chemical reactions

To help in making new compounds

Solution

Question 9

1, 15, 17

15, 17, 7

7, 17, 15

17, 15, 7

Solution

Question 10

Generation of ATP and NADPH$$_{2}$$

Reduction of CO$$_{2}$$

Splitting of water

Disintegration of plastids

Solution

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