Tag: enzymes

Questions Related to enzymes

An example of destructive metabolism (catabolism) is

bio-chemistry carbohydrate metabolism metabolism enzymes metabolism, cell respiration, and photosynthesis

  1. Photosynthesis

  2. Respiration

  3. Glycogenesis

  4. Both B and C

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Correct Option: B
Explanation:

Destructive metabolism is the breakdown of more complex substances into simpler ones with release of energy.

And Respiration is concerned with the release of energy from the oxidation of complex organic compounds.
so technically respiration is a type of Catabolism.
While the other two are anabolic because in both the process substances are synthesised and used in the body.

Which one of the following is a catabolic process? 

bio-chemistry carbohydrate metabolism metabolism enzymes metabolism, cell respiration, and photosynthesis

  1. Regulation

  2. Photosynthesis

  3. Digestion

  4. Secretion

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Correct Option: C
Explanation:

Metabolism refers to series of reactions in which product of one reaction becomes reactant for the next one. It includes catabolism (degradative pathways) and anabolism (synthetic pathways). Digestion is the process in which complex compounds are broken down into the simpler form. Hence, option C is the correct answer. 

Assertion : Smaller the organism higher is the rate of metabolism per gram weight. 

Reason : The heart rate of a six month old baby is much higher than that of an old person. 

bio-chemistry carbohydrate metabolism metabolism enzymes metabolism, cell respiration, and photosynthesis

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion

  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion

  3. If the assertion is true but the reason is false

  4. If both the assertion and reason are false

  5. If the assertion is false but reason is true

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Correct Option: A

Given below is a list of different steps (i-vi) involved in respiration.
(i)    Utilisation of $O _{2}$ by the cells for catabolic reactions.
(ii)   Transport of gases by the blood.
(iii) Pulmonary ventilation by which atmospheric air is drawn in and $CO _{2}$ is released out.
(iv)  Released resultant $CO _{2}$. 
(v)   Diffusion of $O _{2}$ and $CO _{2}$ between blood and tissues. 
(vi) Diffusion of gases ($O _{2}$ and $CO _{2}$) across alveolar tissues.
Select an option which has correct sequence of all the steps.

bio-chemistry carbohydrate metabolism metabolism enzymes metabolism, cell respiration, and photosynthesis

  1. (iii), (vii), (ii), (v), (i), (iv)

  2. (iii), (vi), (i), (v), (ii), (iv)

  3. (iv), (ii), (v), (iii), (i), (v)

  4. (iv), (vi), (ii), (v), (i), (iii)

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Correct Option: A
Explanation:

In the given question, the correct sequence of steps of respiration is:
(iii) Pulmonary ventilation by which atmospheric air is drawn in and CO2 is released out.
(vi) Diffusion of gases (O2 and CO2) across alveolar tissues.
(ii)   Transport of gases by the blood.
(v)   Diffusion of O2 and CO2 between blood and tissues.
(i)    The utilisation of O2 by the cells for catabolic reactions.
(iv)  Released resultant CO2.


So, the correct answer is '(iii), (vi), (ii), (v), (i), (iv)'.

Dark reaction is a

bio-chemistry carbohydrate metabolism metabolism enzymes metabolism, cell respiration, and photosynthesis

  1. Anabolic

  2. Catabolic

  3. Both A and B

  4. None of the above

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Correct Option: A
Explanation:

The anabolic processes are the reactions in which the smaller organic molecules are used for the production of the large complex molecules. The carbon dioxide molecule is fixed in the dark reactions for the formation of the glucose molecule. Six molecules of CO$ _2$ are fixed to form one molecule of glucose in which the energy is stored. 

Thus, the correct answer is option A. 

What are biochemical reactions in the body known as?

bio-chemistry carbohydrate metabolism metabolism enzymes metabolism, cell respiration, and photosynthesis

  1. Anabolic reactions

  2. Metabolic reactions

  3. Catabolic reactions

  4. Vital reactions

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Correct Option: B
Explanation:
All the chemical processes which sustain life. (all cells) Sum of all the chemical reactions that take place in the body, consisting of  anabolism and catabolism. Cellular metabolism refers specifically to the chemical reactions within cells. So, the correct option is "B" (Metabolic reactions).

Which reactions usually release energy that is used to drive chemical reactions.

bio-chemistry carbohydrate metabolism metabolism enzymes metabolism, cell respiration, and photosynthesis

  1. Anabolic

  2. Catabolic

  3. Photosynthesis

  4. None of the above

Show answer
Correct Option: B
Explanation:

Metabolism refers to series of reactions wherein product of one reaction becomes reactant for the next one. It includes catabolism (degradative pathways) and anabolism (synthetic pathways). Catabolic reactions are the reactions in which complex molecules are broken down into smaller simpler molecules. The catabolic reactions are exergonic reactions( energy releasing reactions). While photosynthesis is an anabolic reaction which requires energy for the formation of complex molecules. Hence option B is the correct answer.

The term metabolism indicates a variety reactions carried out at

bio-chemistry carbohydrate metabolism metabolism enzymes metabolism, cell respiration, and photosynthesis

  1. atomic level

  2. molecular level

  3. cellular level

  4. tissue level

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Correct Option: C
Explanation:

The metabolism is a chemical processes that occur within a living organism in order to maintain life and basic unit of life is cell, hence all metabolic reactions occur  in cell. So, the correct option is 'Cellular level'

The enzymes ribulose biphosphate carboxylase-oxygenase and phosphoenol pyruvate carboxylase are activated by

biology metabolism, cell respiration, and photosynthesis metabolism enzymes carbohydrate metabolism

  1. Mg

  2. Zn

  3. Mo

  4. Mn

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Correct Option: A
Explanation:

Both RUBISCO and PEP carboxylase are important enzymes of dark reaction of photosynthesis. RUBISCO catalyzes carboxylation in C3 plants. In the presence of magnesium activated RUBISCO, carbon dioxide combines with ribulose bis phosphate to form phosphoglyceric acid. In C4 plants, mesophyll cells fix carbon dioxide with the help of phospho enol pyruvate in the presence of magnesium activated phospho-enol pyruvate carboxylase.

Haemoglobin is composed of four subunits. When one subunit binds to oxygen, it increases the chances that the other three subunits will also bind to oxygen. What is this type of activity called?

biology metabolism, cell respiration, and photosynthesis metabolism enzymes carbohydrate metabolism

  1. Inhibition

  2. Cooperativity

  3. Enzyme substrate complex

  4. Catalysis

  5. Activation

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Correct Option: B
Explanation:
A. When the binding of chemical shuts off the enzymatic activity, the process is called inhibition.
B. When binding of a molecule to the enzyme increase its affinity for more molecules, it is called cooperativity.
C. Binding of the substrate to the active site of enzyme produces a highly reactive short lived complex called Enzyme substrate complex which breaks into chemical products and unchanged enzyme.
D. Catalysis is the increase in rate of reaction by a catalyst.
E. Activation is the start of reaction by an enzyme.
Hence, the increase in affinity of haemoglobin for oxygen by binding of one oxygen molecule, is cooperativity.
So, the correct answer is 'Cooperativity'.