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Biomolecules Test - 62

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Biomolecules Test - 62
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  • Question 1
    1 / -0
    A polysaccharide employed in tissue culture is
    Solution
    A polysaccharide employed in tissue culture is agar- agar. It is a mucopolysaccharide. It is a polymer of D-galactose 3-6 anhydrous L-galactose having sulphate esterification after every ten galactose unit.  It is used in the laboratory as a culture medium, stiffening and emulsifying agent. It is obtained from Gracilaria, Gelidium and Gelidielia. Thus, the correct is A.
  • Question 2
    1 / -0
    Linkage present in between adjacent glucose residues of cellulose is
    Solution
    Cellulose is a polysaccharide. It is formed by the linkage of beta 1,4 linkage of glucose unit. It is an important component of cell wall of the plant. It is used for production of paper. It does not has free aldehyde group so they are non reducing sugar. It is a fibrous polysaccharide as it exist in form of long chain like structure and are mainly found in plants.
    So, the correct answer is option A.
  • Question 3
    1 / -0
    Total amount of water present in human body cells is
    Solution
    Water present in the human body supports the metabolic reactions in the body. The enzymes which act as a catalyst in the biological reaction acts efficiently in presence of water. The salts like sodium and potassium which dissolves in the water act as a transporter. It helps in the transmission of the nerve impulse. The total amount of water present in human body cells is 20-22 liters.
    So, the correct answer is option A.
  • Question 4
    1 / -0
    Major role of minor elements inside living organisms is to act as
    Solution
    Correct Answer: (D) Cofactor of enzymes.
    Explanation:
    • Minor elements are the elements that are required by the plants in a trace amount.
    • It is required less than$$ 0.1 gm/mg$$ of dry matter weight in the plants.
    • The micronutrients are involved in various functioning of enzymes and cofactors or metal activators.
    Hence, option (D) is the correct answer.
  • Question 5
    1 / -0
    Non-protein part of holoenzyme is
    Solution
    Enzymes are proteins which help to catalyze the biochemical reaction. The enzyme has a protein part which is not active is known as apoenzyme. It gets activated by the addition of an organic or inorganic cofactor. The holoenzyme is defined as apoenzyme in combination with the cofactor. The cofactor is a non-protein part of the enzyme. It can be metal ions or the organic chemical. The cofactors which are organic chemicals are known as a coenzyme. The tightly bound coenzymes are the prosthetic group.
    So, the correct answer is option B.
  • Question 6
    1 / -0
    Epimerase belongs to the class of enzymes
    Solution
    Isomerase is the enzyme which changes the rearrangement of the structure of molecules into isomer. Isomers having a same molecular formula with a different structure. Epimerase is a type of isomerase which changes the position of one carbon group like xylulose 5-phosphate into Ribulose 5-phosphate. Thus, the correct option is C.
  • Question 7
    1 / -0
    Protomers are
    Solution
    Oligoproteins are the proteins which are formed by attachment of two different protein. Protomers are the small structural unit of protein which is formed by the two different protein chain. These are oligoproteins which combine to form a heterotetramer. Hemoglobin is a heterotetramer which consists of the dimer of two α, β-protomers. Viral capsomeres are also a combination of protomers. 
    So, the correct answer is option B.
  • Question 8
    1 / -0
    Most of the digestive enzymes belong to the class of
    Solution
    Hydrolase enzymes break large molecules into small molecules with the help of hydrogen and hydroxyl group of water molecules. The phenomenon is known as hydrolysis. Digestive enzymes in our body help to break down macromolecules of food into smaller molecules by the process of hydrolysis. So, digestive enzymes belong to the class Hydrolases. Thus, the correct option is B.
  • Question 9
    1 / -0
    Enzyme aldolase which helps in combining dihydroxy acetone phosphate with glyceraldehyde phosphate belongs to the category of
    Solution
    Lyases are a group of enzymes which catalyze the breakage of specific covalent bonds and removal of groups without hydrolyzes. For example, enzyme aldolase helps in combining dihydroxyacetone phosphate and 3-phosphoglyceraldehyde in glycolysis to form fructose 1,6-diphosphate. 
    Thus, the correct answer is option D. 

  • Question 10
    1 / -0
    Substrate concentration at which an enzyme attains half its maximum velocity is
    Solution
    k$$_m$$ or Michaelis constant is defined as the substrate concentration at which half of the enzyme molecules are forming (ES) complex or concentration of the substrate when the velocity of the enzyme reaction is half the maximum value. The k$$_m$$ varies from enzyme to enzyme and is used in characterizing the different enzymes. A smaller k$$_m$$ value indicates greater affinity of the enzyme for its substrate, hence, shows a quicker reaction. So, the correct answer is option C.
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