The Antibiotic Rifamycin Is Selectively Toxic in Blocking Protein Synthesis

question 82

Multiple Choice

The antibiotic rifamycin is selectively toxic in blocking protein synthesis in Mycobacterium tuberculosis because

• A)the drug binds to the initiator tRNA, preventing the formation of the protein synthesis initiation complex in the bacterial cell.
• B)it binds preferentially to bacterial RNA polymerase rather than the eukaryotic protein, effectively halting transcription in the pathogen but not the host.
• C)the antibiotic binds to the mRNA once synthesized, preventing it from participating in the initiation complex with the ribosome.
• D)bacterial ribosomes are 70s whereas host ribosome are 80s, thus the antibiotic binds to the M.tuberculosis ribosome but does not bind to the eukaryotic machinery.

Explore the cultural perceptions and ambivalence towards aging.

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Comprehend the concept of age cohorts and their societal implications.

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Definitions:

Greenhouse Gases

Gases in Earth's atmosphere, such as carbon dioxide and methane, that trap heat, leading to a warming effect known as the greenhouse effect.

Fossil Fuels

Natural fuels such as coal, oil, and natural gas, formed from the decomposed remains of plants and animals over millions of years.

CFCs

Chlorofluorocarbons, chemical compounds once commonly used in refrigerants and aerosol sprays that contribute to ozone layer depletion.

Global Warming

The long-term rise in Earth's average surface temperature, primarily due to human activities releasing greenhouse gases, resulting in climate change and associated environmental impacts.