Read the text and answer the multiple-choice question by selecting the correct response. Only one response is correct.
The Food and Drug Administration has recently proposed rough restrictions more or less the subject of the use of antibiotics to look the health and appendix of meat animals. Medications accessory to feeds kill many microorganisms but along with minister to the sky of bacterial strains that are resistant to alongside-infective drugs. Already, for example, penicillin and the tetracyclines are not as functioning therapeutically as they subsequent to were. The drug resistance is chiefly conferred by tiny circlets of genes, called plasmids, that can be exchanged between every choice strains and even every second species of bacteria. Plasmids are with one of the two kinds of vehicles (the added swine viruses) that molecular biologists depend also mention to following performing gene transplant experiments. Even push guidelines forbid the laboratory use of plasmids bearing genes for resistance to antibiotics. Yet, even if congressional debate rages subsequently than again whether or not to toughen these restrictions past hint to scientists in their laboratories, tiny congressional attention has been focused in a description to a poorly-advised agricultural practice that produces known deleterious effects.
Q.According to the passage, the exchange of plasmids between different bacteria can results in which of the following?
(A) Microorganisms resistant to drugs
(B) Therapeutically useful circlets of genes
(C) Anti-infective drugs like penicillin
(D) Viruses for use by molecular biologists
« Previous 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Next »