A clear area against a confluent "lawn" of bacteria is called a
A) phage.
B) pock.
C) cell lysis.
D) plaque.
E) rash.
D
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The most common vector-borne disease in North America and Europe transmitted by the bite of Ixodes ticks is caused by:
a. Leptospira interrogans. b. Borrelia burgdorferi. c. Treponema carateum. d. Rickettsia rickettsii.
The Gram stain distinguished bacteria into two types of cells. This stain is dependent on the amount of in the cell wall.
A. glucose B. a complex lipid C. cellulose D. peptidoglycan E. chitin
A lizard with a striped tail and a normal head crossed with one having a normal tail and a spotted head produce all
normal (no stripes or spots) F1 progeny. What progeny would be expected to be produced by mating either of the parental lizards with another that had a striped tail and spotted head, if the genes conferring stripes and spots were close together on the same chromosome? a. equal numbers of normal, striped, spotted and striped, and spotted b. 3 striped : 1 spotted c. mostly progeny that are striped or spotted d. mostly progeny that are normal or striped and spotted e. 9 normal : 3 striped : 3 spotted : 1 striped and spotted
Evolution by genetic drift is most obvious in
A) migratory species. B) large populations. C) small populations. D) aquatic organisms. E) invertebrate species.