BIO 214 Module 4 Exam A+ Pass

BIO 214 Module 4 Exam A+ Pass Helical and icosahedral are terms used to describe the shapes of a virus: core capsid spike envelope capsomere - Answer- capsid Viruses acquire envelopes around their nucleocapsids during: release penetration assembly adsorption replication - Answer- Release Viruses that cause infection resulting in alternating periods of activity with symptoms and inactivity without symptoms are called: prions delta agents oncogenic chronic viroids - Answer- Chronic Bovine spongiform encephalopathy is: caused by a viroid also called "mad cow disease" a spongiform encephalopathy of humans initiated by an oncogenic virus caused by a chronic latent virus - Answer- also called "mad cow disease" How do viruses enter their host? Bursting the host cell Rupturing the virus Fusion or endocytosis Exocytosis None of these are correct - Answer- Fusion or endocytosis Airways can be sterilized by UV light creating pyrimidine dimers which interfere with DNA replication, this mechanism of sterilization is_________________. Desiccation Ionizing radiation Filtration Non-ionizing radiation Lyophilization - Answer- Non-ionizing radiation Antimicrobics effective against only gram-positive bacteria would be termed: broad-spectrum drugs Macrolides Anti-fungal synthetic drugs narrow-spectrum drugs - Answer- narrow-spectrum drugs Staphylococcus aureus has _______________ resistance to decontamination methods. highest least moderate - Answer- moderate Which of the following describes the mechanism of action for AZT? It inhibits the assembly of HIV particles. It directly binds to reverse transcriptase and prevents reverse transcription of HIV RNA. It is a thymine analog that interferes with DNA synthesis. It inhibits fusion of the viral envelope and host cell envelope. It prevents the viral DNA from integrating in the host chromosome - Answer- It is a thymine analog that interferes with DNA synthesis. _________________ is an antiseptic at low concentrations but a sporicidal at higher concentrations. Quaternary Ammonia Betadine Iodine Alcohol Hydrogen peroxide - Answer- Hydrogen peroxide An antiviral drug that is a thymine analog would have an antiviral mode of action that: blocks DNA replication blocks viral release blocks maturation blocks penetration inhibits peptidoglycan cross linking - Answer- blocks DNA replication Broad-spectrum drugs that disrupt the body's normal flora often cause: All of the choices are correct superinfections commensal infections nephrotoxicity anaphylaxis - Answer- superinfections The process that destroys or removes all microorganisms and microbial forms including bacterial endospores is: antisepsis degermation sanitization disinfection sterilization - Answer- sterilization