A) Feedback inhibition. C) A lipid complex which is an important part of all cel

Question

A) Feedback inhibition. C) A lipid complex which is an important part of all cells. D) A small organic molecule obtained from the diet and necessary for good health. E) A complex molecule of four interlocking hydrocarbon rings. B) Zymogen production. C) Zymogen activation. D) Allosteric interaction. E) Genetic control. 25) When a molecule similar to the correct substrate interacts with the active site of an 30) Antioxidants contribute to good health by reacting with A) Coenzymes. B) Vitamins. C) Hormones. D) Free radicals. E) Hydrogen ions. enzyme, the process is called A) Competitive inhibition. B) Noncompetitive inhibition C) Irreversible inhibition. D) Activation E) Covalent modification. 26) When a molecule other than the correct substrate interacts with some part of an enzyme to alter the shape of the active site, the process is called A) Competitive inhibition. B) Noncompetitive inhibition. C) Irreversible inhibition. D) Activation. E) Covalent modification. 27) Poisons such as heavy metal ions or insecticides can disrupt enzyme function by A) Competitive inhibition. B) Irreversible inhibition. C) Disruption of tertiary structure. D) Covalent modification. E) all of the above 31) All of the following vitamins are fat soluble except A) Vitamin A. B) Vitamin K. C) Vitamin C. D) Vitamin D. E) Vitamin E. 32) Which of the following fat-soluble vitamins is associated with good night vision? A) Vitamin A B) Vitamin D C) Vitamin E D) Vitamin K E) More than one answer is possible. 28) All of the following are mechanisms for control of enzyme activity except A) Inhibition. B) Feedback. 33) Which of the following fat-soluble vitamins is associated with blood clotting factors? A) Vitamin A B) Vitamin D C) Vitamin E D) Vitamin K E) More than one answer is possible. C) Allosteric interactions. D) Genetic regulation. E) Hydrolysis. 29) A vitamin is A) A nutrient involving trace metals that is necessary for good health. B) A polypeptide used to manufacture enzymes

Explanation / Answer

25)

When a molecule similar to correct substrate interacts with active site of enzyme, it inhibits the activity of enzyme by competing with correct substrate. Therefore, this process is called as competitive inhibition.

Hence, correct answer is A)

26)

When a molecule other than substrate interacts with some part of molecule, it is not competing with substrate. However, still it is able to inhibit enzyme by altering the shape of active site. Therefore, this process is called as noncompetitive inhibition.

Hence, correct answer is B)

27)

Poisons such as heavy metal ions or insecticide interact with enzymes irreversibly, thus inhibiting their activity.

Therefore, correct answer is B)

28)

Enzyme activity is controlled by inhibition, feedback, allosteric interaction and genetic regulation. Hydrolysis does not help in controlling activity of enzyme. It degrades the enzyme.

Therefore, correct answer is E)

29)

A vitamin is a small organic molecule, which is obtained from diet and is necessary for good health.

Therefore correct answer is D)

30)

Antioxidants contribute to good health by reacting with free radicals. Free radicals are formed by oxidation reactions and they may damage cells. Antioxidants help in reducing free radicals.

Therefore, correct answer is D)

31)

Fat soluble vitamins are A, K, D and E. Vitamin C is water soluble.

Therefore, correct answer is C)

32)

Vitamin A is associated with vision and it is a fat soluble vitamin.

Therefore, correct answer is A)

33)

Vitamin K is the fat soluble vitamin which is associated with blood clotting factor.

Therefore, correct answer is D)

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