Which statement about antibiotics is correct?
▶️ Answer/Explanation
Ans: A
Antibiotics are indeed drugs used to treat bacterial infections. They’re produced by fungi/bacteria (not white blood cells), bacteria become resistant to them (not vice versa), and they don’t work on viruses. Thus, only statement A is correct.
Which statements about drugs are correct?
- Drugs affect or modify chemical reactions in the body.
- Drugs called antibiotics can be used to kill bacteria.
- Drugs called antibiotics can be used to kill viruses.
A) 1 and 2
B) 2 and 3
C) 1 only
D) 2 only
▶️ Answer/Explanation
Ans: A
Analysis of each statement:
- Correct: Drugs alter biochemical processes (e.g., painkillers block pain signals, antibiotics disrupt bacterial metabolism).
- Correct: Antibiotics specifically target bacteria (e.g., penicillin inhibits bacterial cell wall synthesis).
- Incorrect: Antibiotics are ineffective against viruses; antivirals or vaccines are required for viral infections.
Thus, only statements 1 and 2 are correct, making A the right choice.
Question
In an experiment, bacteria were grown on agar. Four paper discs, A, B, C and D, were placed on top of the agar. Each paper disc contained a different antibiotic. The diagram shows the agar after 48 hours. The clear areas show where bacteria are not growing. Which antibiotic are the bacteria most resistant to?
▶️Answer/Explanation
Ans B
Question
Which statements about drugs are correct?
1 Drugs affect or modify chemical reactions in the body.
2 Drugs called antibiotics can be used to kill bacteria.
3 Drugs called antibiotics can be used to kill viruses.
A 1 and 2
B 2 and 3
C 1 only
D 2 only
▶️Answer/Explanation
Ans A
Question
A disease cannot be treated with antibiotics.
What could be the reasons for this?
1 It is not a bacterial disease.
2 The pathogen is a virus.
3 The patient has become resistant to the antibiotic.
(A) 1 and 2 only
(B) 1 and 3 only
(C) 2 and 3 only
(D) 1, 2 and 3
▶️Answer/Explanation
Ans: A
Question
What is the definition of a drug?
(A) a substance produced by a gland that is carried in the blood and alters the activity of target organs
(B) a substance produced by white blood cells that is carried in the blood and destroys bacteria and viruses
(C) a substance taken into the body that modifies or affects chemical reactions carried out in the body
(D) a substance that increases the rate of chemical reactions in the body and is not changed by the reaction
▶️Answer/Explanation
Ans : C