__________ are electrically excitable cells that signal other cells by means of chemical messages. Fill in the blank(s) with the appropriate word(s)
ANSWER: Neurons
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Within the typical sexual reproduction of green algae, the genetic composition of the sporophyte form of the protist is
A. limited to the DNA found within the chloroplasts, because the sporophyte is a dormant form of the protist. B. 1n, or haploid, because the sporophyte follows meiosis. C. 2n, or diploid, because the sporophyte follows fertilization, growing and differentiating through numerous cell cycles. D. None of the answer choices is correct. E. reproduced through mitosis, after the zygote single cell has formed.
The products of light-dependent reactions of photosynthesis
a. are used in light-independent reactions. b. are complex carbohydrates and proteins. c. are stored in the vacuoles of the cell. d. are oxygen and glucose. e. are used in the light-independent reactions and are stored in the vacuoles of the cell
Four of the five answers listed below are related by a similar function. Select the exception
a. intercostal muscles b. medulla oblongata c. aortic bodies d. reticular formation e. carotid bodies
ALL of the following are natural human defenses against disease EXCEPT
a) interferon. b) penicillin. c) skin. d) mucous membranes.