BIOLOGY 299 MICROBIOLOGY TEST 4 RECENT 2023 WITH COMPLETE SOLUTIONS

BIOLOGY 299 MICROBIOLOGY TEST 4 RECENT 2023 WITH COMPLETE SOLUTIONS  A drug that inhibits mitosis, such as grise of ulvin, would be more effective against • gram-positive bacteria. • gram-negative bacteria. • fungi. • wall-less bacteria. • mycobacteria.  Most of the available antimicrobial agents are effective against • viruses. • bacteria. • fungi. • protozoa. • All of the answers are correct.  Antimicrobial peptides(AMPs) frequently work by • inhibiting protein synthesis. • disrupting theplasma membrane. • complementary basepairing with DNA. • inhibiting cell-wall synthesis. • hydrolyzing peptidoglycan.  Inwhat way aresemisynthetic penicillinsand natural penicillinsalike? • Botharebroad spectrum. • Bothareresistant topenicillinase. • Bothareresistant tostomach acids. • Botharebactericidal. • Botharebasedonβ-lactam.  Which of thefollowing antibioticsisNOTbactericidal? • aminoglycosides • cephalosporins • polyenes • rifampins • penicillin  Whichoneof thefollowing doesNOTbelongwith theothers? • bacitracin • cephalosporin • monobactam • penicillin • streptomycin  Figure 20.1 Theantibiotic tetracyclinebindstothe30Ssubunit of theribosome, asshownby thedark blackbar ontheright portion of thediagraminFigure20.1. Theeffect isto • prevent attachment of DNA. • prevent peptidebond formation. • prevent transcription. • stop theribosomefrommoving alongthemRNA. • interferewith theattachment of thetRNAtomRNA-ribosomecomplex.  Figure20.2 Theantibiotic chloramphenicol bindstothe50Ssubunit of theribosome, asshownin Figure 20.2. Theeffect isto A) prevent mRNA-ribosomebinding ineukaryotes. B) prevent peptidebond formation inprokaryotes