Ascientist discovers that a soil bacterium he has been studying produces an antimic robial that kills gramnegative bacteria. she isolates and purifies the anti microbial compound, then chemically converts a chemical side chain to a hydroxyl group. when she tests the anti microbial properties of this new version, she finds that this antimicrobial drug can now also kill gram-positive bacteria. thenew anti microbial drug with broad-spectru mactivity is considere dto be which of the following? a. resistantb. semisyntheticc. syntheticd. natural

The correct answer will be option-B (Semi-synthetic)

Explanation:

Chemical drugs can be synthesized through many ways on the basis of which they can be categorized:

1. Natural Drug: The drug prepared from the natural extracts.

2. Synthetic Drug: The drug is synthesized by chemical reactions.

3. Semi-synthetic Drug: The drug which is neither completely natural nor synthetic that is they are prepared from the natural extracts by modifying them.

Since in the given question, the drug was prepared by the converting side chain to the hydroxyl group of the antimicrobial drug therefore it is considered as the semi-synthetic drug and Option-B is the correct answer.

1. (1.2kw)x(15/60hours) = .3kwh --> a

2. (5kw)x(90/60hours)x(8cents/kwh) = $0.60 --> d

3. microwave --> 1200 watts = (1.2kw)x(6/60hours) = .12kwh

coffee-maker --> 900 watts = (.9kw)x(10/60hours) = .15kwh

therefore, it requires more energy for the coffee-maker to do the same amount of work.

so the answer is a.

air enters through the nose, moves through the nasal cavity, the pharynx, the larynx, enters the trachea, moves through the bronchi andbronchioles till the alveoli.