Beta-hemolytic group A streptococci are responsible for ________.
A. pharyngitis
B. necrotizing fasciitis
C. rheumatic fever
D. All of the choices are correct.
Answer: D
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Leeches belong to the phylum
(a) Arthropoda. (b) Mollusca. (c) Annelida. (d) Cnidaria
A control group is _____
a. a set of individuals that have a certain characteristic or receive a certain treatment b. the standard against which an experimental group is compared c. the experiment that gives conclusive results
In a fruit fly embryo, a homeotic gene Antp determines where legs grow. When the promoter of Antp is mutated, a fly ends up with legs growing out of its head in place of antennae. In this mutation
A. antennae grow where the legs would normally be found. B. Antp must be turned off in all of the fly cells. C. Antp must be turned on in the head. D. the Antp gene, and its transcription factor, and enhancer sequence are turned on in the head. E. the Antp enhancer sequence, or transcription factor, is not functional.
In humans, X-linked genetic diseases
a. are associated with autosomes. b. tend to be expressed more in females than males. c. only affect males. d. tend to be expressed more in males than in females.