Tag: bio-chemistry

Quizzes (82) Questions (1918)

Questions Related to bio-chemistry

Multiple choice bio-chemistry organization of life concept of metabolism metabolism in animals metabolism

Which of the following activity is catabolic in nature?

  1. Cell repair

  2. Protoplasm synthesis

  3. Degradation of amino acid in liver

  4. Conversion of glucose to glycogen
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Catabolism involves the breakdown of a substance, often to release energy or during excretion for removal of waste. Degradation of amino acids in the liver is such an example where amino acids are broken down into inorganic substituents for recycling or removal.

Cell repair, protoplasm synthesis and conversion of glucose to glucose are all examples of anabolism which involves the synthesis of a product.
So the correct answer is 'Degradation of amino acids in the liver'.

Multiple choice bio-chemistry organization of life concept of metabolism metabolism in animals metabolism

Glycogenolysis is a 

  1. Anabolic reaction

  2. Catabolic reaction

  3. Both A and B

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

The catabolic processes are the reactions in which the large complex molecules are broken down to produce smaller organic molecules. The polysaccharide which is a complex molecule is broken down to from many small monosaccharide molecules. For example, glycogen is broken down to produce glucose molecules and the process is known as glycogenolysis. 

Thus, the correct answer is option B. 

Multiple choice bio-chemistry organization of life concept of metabolism metabolism in animals metabolism

Formation of nucleotide is a

  1. Anabolic reaction

  2. Catabolic reaction

  3. Both A and B

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

The nucleotides can be formed by two paths. When the nucleotide is formed due to the breaking of the bonds in the RNA and DNA, this process is an example of a catabolic process. When the nucleotides are formed from the nucleosides and nitrogenous bases, then this is an example of an anabolic process. 

Thus, the correct answer is option C. 

Multiple choice bio-chemistry organization of life concept of metabolism metabolism in animals metabolism

Which of the following statement can be related to catabolism?

  1. It is an exergonic reaction

  2. It is an endergonic reaction

  3. It helps to break complex molecules to simple ones.

  4. Both A and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The catabolic processes are the reactions in which the large complex molecules are broken down to form the smaller molecules. The process is an exergonic process in which the energy is released due to the breaking of the bonds of the larger complex molecules. The energy is released due to breaking of the bonds in the ATP molecule to produce ADP or AMP. 

Thus, the correct answer is option D. 

Multiple choice bio-chemistry organization of life concept of metabolism metabolism in animals metabolism

Which is correct for catabolism of 18 C fatty acid

  1. Mitochondria, beta oxidation, 148 ATP molecules

  2. Mitochondria, beta oxidation, 140 ATP molecules

  3. Cytosol, beta oxidation, 146 ATP molecules

  4. Cytosol, beta oxidation, 140 ATP molecules
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

For an 18-carbon fatty acid (stearic acid), beta-oxidation occurs in the mitochondria. The process yields 9 acetyl-CoA, 8 NADH, and 8 FADH2, resulting in a total of 148 ATP molecules after complete oxidation.

Multiple choice bio-chemistry organization of life concept of metabolism metabolism in animals metabolism

Identify the anabolic process from the following.

  1. Photosynthesis

  2. Glycolysis

  3. Hydrolysis of starch

  4. Respiration
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Anabolism is the category of metabolism in which bio-molecules are synthesized. Whereas catabolism is breaking down of bio-molecules into simpler forms, mostly for the release of energy. 
  • During photosynthesis, carbohydrate is formed from carbon dioxide and water in presence of sunlight. 
  • Glycolysis is catabolic process releasing ATP.
  • Hydrolysis of starch is the break down of starch into simpler monosaccharides using water.
  • Respiration is the oxidative process releasing ATP. It has both catabolic as well as anabolic reactions involved hence it is rather considered as an amphibolic process.
So, the correct option is 'Photosynthesis'.
Multiple choice bio-chemistry organization of life concept of metabolism metabolism in animals metabolism

Photosynthesis is an example of 

  1. Anabolism

  2. Endergonic reactions

  3. Both A and B

  4. Exergonic reactions
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • Photosynthesis is the process by which plants, some bacteria, and some protistans use the energy from sunlight to produce glucose from carbon dioxide and water. This glucose can be converted into pyruvate which releases adenosine triphosphate (ATP) by cellular respiration. Oxygen is also formed.
  • Anabolic processes are processes that build up compounds. As photosynthesis build up glucose hence it is an anabolic process.
  • An endergonic reaction requires or absorbs energy from its surroundings. Photosynthesis is an endergonic reaction. The energy required for photosynthesis comes from light hence endergonic.
  • Hence Photosynthesis is an example of Anabolism and endergonic reactions.
  • So, the correct answer is 'Both A and B'.
Multiple choice bio-chemistry organization of life concept of metabolism metabolism in animals metabolism

A regulatory gene produces some kind of protein through its mRNA that controls the activity of the operator gene which signals the formation of specific enzymes required for the metabolic breakdown of the food. How does that protein regulate the activity of the operator gene?

  1. The repressor protein produced after combining with an inducer activates the operator gene

  2. The repressor protein produced after combining with a co repressor activates the operator gene

  3. The catabolic activator protein(CAP) produced activates the operator gene

  4. The mutated repressor protein produced activates the operator gene
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In the lac operon model, a repressor protein binds to the operator to block transcription. When an inducer (like lactose) is present, it binds to the repressor, changing its shape so it can no longer bind to the operator, thus activating the gene.

Multiple choice bio-chemistry organization of life concept of metabolism metabolism in animals metabolism

Which of the following is a catabolic reaction?

  1. Intercellular digestion

  2. Intracellular digestion

  3. Respiration

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The catabolic processes are the reactions in which the large complex molecules are broken down to form the smaller molecules. The process is an exergonic process in which the energy is released due to the breaking of the bonds of the larger complex molecules. Intracellular digestion refers to the breaking of the larger molecules. Intercellular digestion is the processes in which the molecules are broken down outside the cell and then absorbed. During internal respiration, there is the breakdown of the molecules to produce ATP. 

Thus, the correct answer is option D. 

Multiple choice bio-chemistry organization of life concept of metabolism metabolism in animals metabolism

Choose the correct answers from the alternatives given .
All the chemical energy transformations that occur within a cell is called

  1. metabolism

  2. adaptation

  3. homeostasis

  4. photosynthesis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Metabolism is the set of life-sustaining chemical processes that enable organisms to transform the chemical energy stored in molecules into energy that can be used for cellular processes.
So, the correct option is 'metabolism'