On very wavy rocky shores, mussels will occupy the ____ zone without being affected too much by predation
a. lower intertidal
b. upper intertidal
c. middle intertidal
d. supratidal
e. splash
A
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For reliable results, the niacin test should be performed only from cultures that are at least:
a. 2 weeks old and show at least five colo-nies on Löwenstein-Jensen medium. b. 3 weeks old and show at least 50 colonies on Löwenstein-Jensen medium. c. 3 weeks old and show at least 50 colonies on Middlebrook 7H11 agar. d. 2 weeks old and show at least five colo-nies on Middlebrook 7H11 agar.
During weeks 5 - 6 which major structural feature is present on the developing embryo?
a. Stubby tail b. Pharyngeal arches c. Lower limb buds d. Umbilical cord e. Distinct fingers and toes
Which of the following processes generates a continuum (spectrum) of varying phenotypes?
A) Pleiotropy B) Polygenic inheritance C) Epistasis D) Single-gene traits
The stem apical meristem gives rise to:
a. leaf primordia. b. lateral meristems. c. root caps. d. root hairs. e. cork cells.