The concentration of virus that infects or kills 50% of the host cells is referred to as the

A. LD50.
B. ID50.
C. ID100.
D. LD100.
E. LD50 AND ID50.


E

Biology & Microbiology

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The internal body fluids of an osmoconformer can best be described as having:

A. roughly the same total solute concentration as the external environment. B. a higher solute concentration than the external environment. C. a lower solute concentration than the external environment. D. all of the same concentrations of particular ions as the external environment. E. None of the answer options is correct.

Biology & Microbiology

All of the following are model organisms, except

A) Saccharomyces cerevisiae. B) Drosophila melanogaster. C) Caenorhabditis elegans. D) Arabidopsis thialana. E) Homo sapiens.

Biology & Microbiology

Formation of urine involves filtration, reabsorption and secretion, all of which are done by the bladder.

a. true b. false

Biology & Microbiology

Which of the following crosses will yield four phenotypes in a ratio of 9:3:3:1?

Select one: a. RRYY × RRYY b. RRYY × rryy c. RrYy × RrYy d. RrYy × rryy e. rryy × rryy

Biology & Microbiology