Tag: carbohydrate metabolism

Quizzes (9) Questions (178)

Questions Related to carbohydrate metabolism

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

Chemical reactions require energy for

  1. Oxidation

  2. Entropy

  3. Activation

  4. Enthalpy
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Chemical reactions take place mainly at a specific temperature in presence of a catalyst. The substrate and product have different energy state. The energy gap between the substrate and the product is known as activation energy which is the minimum energy required to initiate a reaction. In presence of a catalyst, the activation energy lowers and the substrate changes into the product.

So, the correct answer is option C.

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

Energy required for start of a chemical reaction is

  1. Activation energy

  2. Entropy

  3. Potential energy

  4. Kinetic energy
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Entropy is a measure of thermal energy.
Potential energy is the energy stored in an object at a particular height.
Kinetic energy is the energy stored in an object in motion.
Enzymes are proteins which accelerate the rate of the reaction. The substrate and product have different energy state. The energy gap between the substrate and the product is known as activation energy which is the minimum energy required to initiate a reaction. The enzymes lower the activation energy and lead to the faster conversion of substrate to the product.
So, the correct answer is option A.
Multiple choice biology metabolism, cell respiration, and photosynthesis metabolism enzymes carbohydrate metabolism

Activation energy is required for :

  1. Bringing reactants together

  2. Destabilisation of bonds of reactants.

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Activation energy is the energy required to bring reactants into a transition state, which involves both bringing them together in the correct orientation and destabilizing their existing bonds to facilitate the reaction.

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

Enzymes increase the rate of biochemical reaction through 

  1. Changing equilibrium

  2. Lowering activation energy

  3. Forming reactant-product complex

  4. Forming enzyme-product complex.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Enzymes are biological catalysts. A catalyst is a chemical that increases the rate of a chemical reaction without itself being changed by the reaction. Without a catalyst, the amount of energy required for the reaction is large. Enzymes and catalysts both affect the rate of a reaction. The lower the activation energy for a reaction, the faster the rate of chemical reaction. Thus enzymes speed up reactions by lowering activation energy.

So, the correct answer is option B.

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

Enzymes enhance rate of reaction by

  1. Combining with product

  2. Forming reactant-product complex

  3. Changing equilibrium of reaction

  4. Lowering activation energy
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Enzymes are proteins which accelerate the rate of the reaction. The substrate and product have different energy state. The energy gap between the substrate and the product is known as activation energy which is the minimum energy required to initiate a reaction. The enzymes lower the activation energy and lead to the faster conversion of substrate to the product.

So, the correct answer is option D.

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

State whether the following statements are true or false.
The totality of metabolism in humans must include both anabolism and catabolism.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Metabolism includes both the synthesis of biomolecules(known as anabolism) and breaking down of substrates to generate energy(known as catabolism).

So, the correct option is 'The totality of metabolism in humans must include both anabolism and catabolism.'

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

An example of destructive metabolism (catabolism) is

  1. Photosynthesis

  2. Respiration

  3. Glycogenesis

  4. Both B and C
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Which one of the following is a catabolic process? 

  1. Regulation

  2. Photosynthesis

  3. Digestion

  4. Secretion
Reveal answer Fill a bubble to check yourself
C Correct answer
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. 

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

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. 

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Smaller organisms have a higher surface-area-to-volume ratio, leading to faster heat loss and thus a higher metabolic rate to maintain body temperature. The heart rate of a baby is higher than an adult, which is a physiological manifestation of this higher metabolic rate.

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

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.

  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)
Reveal answer Fill a bubble to check yourself
A Correct answer
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)'.