A substance that "teaches" the immune system to recognize a disease-causing agent without actually causing a disease is termed a(n)

A. antibiotic.
B. sulfa drug.
C. analgesic.
D. vaccine.
E. injection.


D. vaccine.

Biology & Microbiology

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Gene regulation by siRNA is ____ in eukaryotes and may have evolved originally as a ____

A. rare; way to regulate gene expression B. widespread; way to regulate gene expression C. rare; defense against mutations that may cause cancer D. widespread; defense against viruses E. rare; defense against viruses

Biology & Microbiology

Which of the following is NOT a condition of the Hardy-Weinberg equilibrium?

A. No differences in the survival and reproductive success of individuals B. No migration C. No mutation D. Random mating E. All of the conditions listed ARE conditions of the Hardy-Weinberg equilibrium.

Biology & Microbiology

The DNA of a bacterial cell must be compacted about _______ fold to fit within the confines of the cell

A. 10 B. 100 C. 150 D. 1000 E. 1,000,000

Biology & Microbiology

Which fungal phylum has the fewest known living species even though they collectively make up

roughly half of the fungi in the soil?

a. Glomeromycota b. Basidiomycota c. Chytridiomycota d. Zygomycota e. Ascomycota

Biology & Microbiology