A structure that "spot welds" skin cells is a __________
Fill in the blank(s) with correct word
desmosome
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If potassium channels in a neuron were blocked, would it be possible to produce an action potential? If so, describe the probable appearance of these components of a graph: threshold, rising phase, peak, falling phase, undershoot. If not, explain.
What will be an ideal response?
Energy sources available to form ATP in muscle fibers are
1 . phosphorylation of ADP by creatine phosphate 2 . oxidative phosphorylation of ADP in the mitochondria 3 . phosphorylation of ADP by the glycolytic pathway in the cytosol a. (1) and (2) are correct. b. (2) and (3) are correct. c. (1) and (3) are correct. d. (1), (2), and (3) are correct. e. none of these answers.
Which of the following human cells has a flagellum?
A) sperm B) kidneys C) intestine D) testes
The primary germ layer that takes the place of the hypoblast is the
A. mesoderm. B. endoderm. C. trophoblast. D. chorion. E. centroderm.