Which level of biological organization is composed of tissues?
(a). organism
(b). organ system
(c). organ
(d). cell
(e). molecules
(c). organ
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Which of the following is a Wnt pathway membrane protein?
A. Wnt B. Dsh C. frizzled D. Hedgehog
The primary reservoir of the Mycobacterium responsible for leprosy is:
a. infected humans. b. infected animals. c. contaminated food. d. contaminated objects.
Which of the following is NOT a characteristic
of Australopithecus afarensis?
a. chimpanzee sized brain b. narrow pelvis c. S-shaped backbone d. opening at the base of the skull e. more than one of these is NOT a characteristic of A.afarensis
When a neuron is at rest, what maintains the high concentration gradients of potassium ions inside the cell and sodium ions outside the cell?
A) diffusion B) osmosis C) active transport D) ion channels