Gram-positive bacteria such as Propionibacterium acnes limit the growth of gram-negative bacteria and some fungi on the human skin by converting secreted ________ to compounds with antimicrobial activity.

A. urea
B. lipids
C. organic acids
D. salts


Answer: B

Biology & Microbiology

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If immersion oil was replaced with water, what would happen?

A. The refractive index of water would be greater than air but less than oil, improving resolution less than oil. B. The refractive index of water would be less than that of air, decreasing resolution. C. The refractive index would increase, improving resolution. D. There would be no difference.

Biology & Microbiology

Several genetic disorders, including Fanconi anemia and ataxia telangiectasia, are caused by mutations in ____

a. the cell wall b. mitochondrial DNA c. ribosome structure d. DNA repair genes e. DNA polymerase genes

Biology & Microbiology

A person goes to the doctor and is told his blood pressure is 90/60 and his pulse is 80. Which of the following is FALSE?

A) Mean arterial pressure is 70 mm Hg. B) Diastolic pressure is 60. C) Systolic pressure is 90 mm Hg. D) Pulse pressure is 80 mm Hg. E) Heart rate is 80.

Biology & Microbiology

The peripheral proteins may also function in

What will be an ideal response?

Biology & Microbiology