Biomolecules Test

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Biomolecules Test - 35

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Weekly Quiz Competition

Question 1
1 / -0

An enzyme promotes a chemical reaction by :

A
increasing molecular motion

B
lowering the energy of activation

C
causing the release of heat, which acts as a primer

D
changing the free energy difference between substrate and Product
Question 2
1 / -0

Activation energy is required for.

A
exothermalre a ctions

B
endothermal reactions

C
enzyme mediated reaction

D
starting all biochemical reactions
Question 3
1 / -0

The following is a storage protein:

A
keratin

B
collagen

C
glutein

D
hemoglobin

Solution

C. Glutein
Solution : Gluten is a group of seed storage proteins found in certain cereal grains.
So the correct answer is " glutein".
Question 4
1 / -0

The primary structure of a protein is due to :

A
hydrogen bonds

B
peptide bonds

C
-S-S-linkages

D
ionic bonds
Question 5
1 / -0

The fundamental building block of protein is

A
nitorgen

B
$$NH_{2}$$ group

C
COOH group

D
amino acid
Question 6
1 / -0

Nitrogen forms the essential constituent of

A
carbohydrates

B
fats

C
mineral salts

D
proteins
Question 7
1 / -0

The energy necessary for active transport across cytoplasmic membranes is believed to come from

A
ATP

B
Diffusion

C
Osmosis

D
Kinetic energy

Solution

ATP is the energy currency of our body produced by the oxidation of food in the cell. ATP is utilized to proceed different metabolic process. Active transport is the movement of molecules across a cell membrane in the direction against the concentration gradient i.e., moving from an area of lower concentration to an area of higher concentration with the involvement of energy in the form of ATP.
Question 8
1 / -0

Which one of the following graphs, best represents the effect of substrate concentration on enzyme reaction?

A

B

C

D

Solution

One of the important parameters affecting the rate of a reaction catalyzed by an enzyme is the substrate concentration, [S]. During enzyme substrate reaction, the initial velocity V$$_0$$ gradually increases with increasing concentration of the substrate.
Finally a point is reached, beyond which the increase in V$$_0$$ will not depend on the [S].
When we plot a graph, with substrate concentration on the X axis and corresponding velocity on Y axis, it can be observed from the graph that as the concentration of the substrate increases, there is a corresponding increase in the V$$_0$$. However, beyond a particular substrate concentration, the velocity remains constant without any further increase. This maximum velocity of an enzyme catalysed reaction under substrate saturation is called as the V$$_{max}$$, maximum velocity.
Thus, option B is correct.
Question 9
1 / -0

The essential chemical processes in living organisms are

A
Catabolism

B
Anabolism

C
Respiration

D
All of the above
Solution
Anabolism and catabolism are the two broad classes of biochemical reactions that make up metabolism.
Anabolism is the synthesis of complex molecules from simpler ones. These chemical reactions require energy.
Catabolism is the breakdown of complex molecules into simpler ones. These reactions release energy.
Anabolic and catabolic pathways typically work together, with the energy from catabolism providing the energy for anabolism.
Respiration is the process in which organisms exchange gases between their body cells and the environment.Respiration may refer to the metabolic processes of converting the energy stored in biological molecules to usable energy in the form of ATP. Three types of respiration include internal, external, and cellular respiration.
Hence, these are the essential chemical processes in living organisms.
So, the correct answer is 'All of the above'
Question 10
1 / -0

Quantity of nucleic acids in animal cells is

A
2-5%

B
5-8%

C
10-13%

D
15-18%

Solution

Cells have two types of nucleic acids deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). In a eukaryotic cell, DNA is present in nucleus and cell organelles like mitochondria and chloroplast. RNA in a eukaryotic cell is present in the cytoplasm, nucleoplasm, and organelles like mitochondria and chloroplasts. Much more RNA is present in a cell than DNA. An abundant form of RNA is rRNA, which is a component of ribosomes. Add together roughly 1 percent of the total cell weight is the quantity of DNA and 6 percent of the total cell weight is the quantity of RNA.
So, the correct answer is option B.