Which of the following forms of communication do not rely on vision?
a. tactile
b. pheromones
c. mutualism
d. both tactile and pheromones
D
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In smooth muscle cells, acetylcholine stimulates activation of the enzyme ________, which cleaves ________ to form the second messengers ________ and ________
Fill in the blank with correct word.
Which of the following represents what Darwin thought of artificial selection?
a. He reasoned that if characteristics that better enable organisms to adapt to specific environmental pressures exist, then artificial selection will tend to increase those in succeeding generations. b. He reasoned that if a person could select different characteristics when breeding organisms, then nature could do so as well. c. Humans were selecting the characteristics they wanted in the offspring by choosing parents with those traits. d. Humans were selecting the characteristics they wanted in the offspring by eliminating individuals that did not s
Viral cultivation is used for
A. observing the effects of viral infection on host cells. B. studying the viral life cycle within host cells. C. diagnosis of viral infections. D. preparation of vaccines. E. producing adequate numbers of viruses for research purposes. F. All of these choices are correct.
The number and sequence of amino acids describe a protein's _____ structure.
A) primary B) secondary C) tertiary D) quaternary E) pentary