Question

1. antibiotics are often used to treat bacterial infections. rifampicin is an antibiotic that inhibits rna polymerase in certain types of bacteria but does not affect mammalian cells. how is rifampicin able to treat bacterial infections in humans?a rifampicin creates toxic byproducts in bacterial cells.b rifampicin blocks bacterial dna replication.c rifampicin causes mutations in bacterial dna.d rifampicin blocks protein synthesis in bacteria.according to the chart, which amino acids are coded for by the following portion of an mrna strand?auggauuacacuca methionine, aspartic acid, tyrosine, leucineb methionine, glycine, leucine, leucinec tyrosine, leucine, methionined threonine, aspartic acid, cysteine, valine

Explanation:

For question 10: Rifampicin targets bacterial RNA polymerase, which is distinct from mammalian RNA polymerase, so it blocks bacterial protein synthesis (transcription step) without harming human cells.
For the translation question: Split the mRNA strand into codons: AUG, GAU, UAC, AUC. AUG codes for methionine, GAU codes for aspartic acid, UAC codes for tyrosine, AUC codes for isoleucine.

Answer:

1. D. Rifampicin blocks protein synthesis in bacteria.

Translation question: A. methionine, aspartic acid, tyrosine, isoleucine