Antibiotics works against a)bacteria b) virus c)elephantiasis d) dengue​

Why antibiotic effective against bacteria butnot against viruses?

An antibiotic is not useful against a virus whereas a vaccine is. Which one of the following is the most appropriate reason for this?

Passage 2 Antibiotics are the chemical substances which are produced by microorganisms like bacteria, fungi and moulds. Antibiotics can inhibit the growth or even destroy other microorganisms. Now-a-days, synthetic antibiotics are also available. The first successful antibiotic produced was penicillin. The antibiotics may be either bacteriocidal (kills the organism in the body) or bacteriostatic (inhibits the growth of organism). Ampicillin and amoxycillin are modified antibiotics. Broad spectrum antibiotics are effective against several types of harmful microorganisms. 3. Which among the following antibiotics is bacteriostatic ?

Passage 2 Antibiotics are the chemical substances which are produced by microorganisms like bacteria, fungi and moulds. Antibiotics can inhibit the growth or even destroy other microorganisms. Now-a-days, synthetic antibiotics are also available. The first successful antibiotic produced was penicillin. The antibiotics may be either bacteriocidal (kills the organism in the body) or bacteriostatic (inhibits the growth of organism). Ampicillin and amoxycillin are modified antibiotics. Broad spectrum antibiotics are effective against several types of harmful microorganisms. 2. Which of the following is/are not an antibiotic ?

Passage 2 Antibiotics are the chemical substances which are produced by microorganisms like bacteria, fungi and moulds. Antibiotics can inhibit the growth or even destroy other microorganisms. Now-a-days, synthetic antibiotics are also available. The first successful antibiotic produced was penicillin. The antibiotics may be either bacteriocidal (kills the organism in the body) or bacteriostatic (inhibits the growth of organism). Ampicillin and amoxycillin are modified antibiotics. Broad spectrum antibiotics are effective against several types of harmful microorganisms. Answer the following questions : 1.Chloramphenicol is :

Which of the following is not the application of PCR? a. Detection of very low concentration of bacteria or virus. b. Detection of mutations in genes in suspected cancer patients. c. Amplification of the desired DNA segment. d. Detection of antibodies synthesized against pathogens.

(A) : Antibiotics are produced by bacteria and fungi. (R) : These drugs are not effective against viruses.

Which of the following antibiotics is not effective against infections casued by gram negative bacteria.

Select the most appropriate meaning of the given idiom Work against the clock (a) work against all problems (b) work late in the night (c) work with concentration (d) work in great hurry