Which of the following prevents some bacteria from adhering to mucosal surfaces?

A. IgD
B. IgE
C. IgM
D. IgA


Answer: D

Biology & Microbiology

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When the chromosomes do not separate properly it is called ________

a. nondisjunction b. polyploidy c. monosomic d. trisomic e. aneuploidy

Biology & Microbiology

One critical requirement for life to arise on Earth was time for:a

the atmospheric temperature to increase sufficiently. b. molecules to accumulate and react with one another. c. the Earth's various climates to stabilize. d. the salinity of the oceans to stabilize. e. the ozone layer to form, so that the level of ultraviolet radiation was reduced.

Biology & Microbiology

When mouse satellite DNA is digested with EcoRI, the result is a series of fragments 234 bp in length, as well as fragments that are exactly 2× and 3× this length. Explain these results

What will be an ideal response?

Biology & Microbiology

Which of the following drugs are not matched correctly with their mode of action?

A) Flucytosine: targets fungal DNA replication by blocking transcription when it is converted to a nucleic acid analog that blocks DNA and RNA synthesis B) polyenes: directly interacts with ergosterols which causes targeted plasma membranes to become leaky and leads to cell lysis C) allyamines: inhibits enzymes that build ergosterol which leads to improperly built plasma membranes and fungal cell lysis D) azoles: inhibits ribosome function by entering ribosome as a tRNA, covalently binding to mRNA, and forcing the destruction of the complex E) echinocandin drugs: inhibits fungal cell wall synthesis by targeting an enzyme that makes a component of the fungal cell wall

Biology & Microbiology