By definition, pheromones are chemical signals secreted into the bloodstream Indicate whether the statement is true or false
False - environment
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Many bryophytes have to tolerate desiccation because ___________. (Select all that apply.)
A. they dry out with the environment B. they have little water-storage capacity C. they are restricted to sunny habitats D. they are restricted to saline habitats
Which of the following statements about a resting transmembrane potential is true?
a. If the sodium-potassium pump were blocked, the transmembrane potential would become greater. b. If the resting neuron were suddenly made permeable to positive ions, a transmembrane potential would not form. c. If the resting neuron had no voltage-activated K+ channels, K+ concentrations in cytoplasm would increase. d. If the voltage-activated Na+ channels are blocked, Na+ will not enter the cytoplasm of the neuron. e. If the cytosol developed a negative charge, the resting potential would disappear..
A random variable that takes on an (uncountable) infinite number of values is known as what type of random variable?
A. Continuous B. Probability density function C. Population parameter D. Discrete
Somatic cells ___________________________
(a) are not necessary for sexual reproduction in all eukaryotic organisms. (b) are used to produce germ-line cells when organisms reach sexual maturity (c) leave no progeny. (d) do not contain sex chromosomes.