All Free Biology MCQs with Answers
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19844 questions · page 521 of 1985
5201. Nucleophilic reactions of carboxylic acids are due to the:
- A. Presence of -OH group
- B. Presence of C-O single bond
- C. Presence of C-O double bond
- D. None of these
Explanation: Nucleophilic reaction of carboxylic acids are due to -OH group.
Correct answer: Presence of -OH group5202. Enzymes are:
- A. Non-specific in action
- B. Very reactive
- C. Highly specific
- D. Volatile
Explanation: Explanation for this question will be added soon!
Correct answer: Highly specific5203. On reacting with which of the following carboxylic acids produce CO2?
- A. Carbonate
- B. Bicarbonate
- C. Bisulphites
- D. Both A and B
Explanation: Carboxylic acid decomposes carbonates and bicarbonates evolving carbon dioxide gas with effervsescence.
Correct answer: Both A and B5204. Reduction of ethanoic acid with LiAlH4 produces:
- A. Propanol
- B. Ethanal
- C. Ethanol
- D. Ethane
Explanation: Explanation for this question will be added soon!
Correct answer: Ethanol5205. Which of the following is an example of tricarboxylic acids?
- A. Maleic acid
- B. Citric acid
- C. Butyric acid
- D. None of these
Explanation: Explanation for this question will be added soon!
Correct answer: Citric acid5206. Activator of carbonic anhydrase enzyme is:
- A. Mn2+
- B. Mg2+
- C. Zn2+
- D. None of these
Explanation: Explanation for this question will be added soon!
Correct answer: Zn2+5207. Denaturing of protein is_process:
- A. Reversible
- B. Irreversible
- C. Equilibrium
- D. all of these
Explanation: Explanation for this question will be added soon!
Correct answer: Irreversible5208. When two carboxylic acids are strongly heated in the presence of P2O5, which product is formed?
- A. Acid halides
- B. Dimer
- C. Acid anhydrid
- D. None of these
Explanation: Explanation for this question will be added soon!
Correct answer: Acid anhydrid5209. Which of the following evolves carbon dioxide with sodium bicarbonate?
- A. CH3COOO-H3
- B. CH3CH2OH
- C. CH3CH2COOH
- D. CH3COOOCH3
Explanation: Explanation for this question has been added!
Correct answer: CH3CH2COOH5210. Protein part attached with non-protein part in enzymes belongs to which class of proteins?
- A. Simple
- B. Conjugated'/compound
- C. Derived
- D. All of these
Explanation: Explanation for this question will be added soon!
Correct answer: Conjugated'/compound