MIDTERM EXAM 63A OPTO 310 LEC

Which one of the following is not a common mechanism by which antimicrobial agents kill or inhibit the growth of bacteria?

• damage to cell membranes

• inhibition of cell wall synthesis

• destruction of capsules

• inhibition of protein synthesis

Which of the following is not a common mechanism by which antifungal agents work?

• by dissolving hyphae

• by binding with cell membrane sterols

• by blocking nucleic acid synthesis

• by interfering with sterol synthesis

Which antibiotic/s are produced by fungi?

• Erythromycin

• Penicillin and Cephalosporin

• Tetracycline

• Methicillin

Which of the following statements about medical asepsis is false?

• Disinfection is a medical aseptic technique.

• Handwashing is a medical aseptic technique.

• Medical asepsis is considered a clean technique.

• The goal of medical asepsis is to exclude all microorganisms from an area.

Molecules of extrachromosomal DNA are known as:

• plasmids

• plastids

• viral vectors

• prions

Bacteria can develop resistance to a particular antimicrobial agent as a result of a chromosomal mutation or the acquisition of a new gene.  

• TRUE

• FALSE

Bacteria are the only pathogens that have become drug resistant.  

• TRUE

• FALSE

All antimicrobial agents are antibiotics

• TRUE

• FALSE

Which of the following refers to thermophiles?

• microorganisms that grow best at high temperatures.

• are microbes that grow best at moderate temperatures

• microorganisms that prefer cold temperatures

• microbes that prefer refrigerator temperature

The factors that affect microbial growth the the following, EXCEPT one:

• Moisture

• Antiseptics

• Salinity

• pH