Cross bridges can form between actin and myosin when ________
a. troponin is bound to calcium ions
b. tropomyosin wraps around actin and covers myosin binding sites
c. all of the choices
d. calcium pumps transport calcium ions back into the sarcoplasmic reticulum
a
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Which of the following characteristics is NOT
found in all animal groups?
a. multi-cellularity b. coelomate c. heterotrophy d. symmetry e. more than one of these
The indigenous plants and animals of the Galapagos Islands and Cape Verde Islands:a
are the same species as those found on the nearby mainland. b. are the same species on the two islands, but are different from those on the mainland. c. are the same species on the two islands and on the mainland. d. are similar to one another, but quite different from either adjacent mainland. e. resemble the nearest mainland species, but have evolved into new species
Approximately what percentage of the visible light that reaches Earth's producers is converted to chemical energy?
A) 10% B) 0.1% C) 1% D) 0.01%
Plant cells that give rise to two cells, one of which is free to differentiate into various kinds of cells that contribute to the plant body, are called
A. meristematic cells. B. parenchyma cells. C. lateral cells. D. primary cells. E. endodermal cells.