In which form(s) can plants generally absorb nitrogen and make use of it?
a. NO3? only
b. both NO3? and NH4+
c. NH4+ only
d. N2 only
Ans: b. both NO3? and NH4+
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Neurons that carry messages from sensory receptors to the CNS are
a. sensory. b. motor. c. interneurons. d. both a and b.
Fast-twitch muscle fibers ________.
Fill in the blank(s) with the appropriate word(s).
Which one of the following statements CORRECTLY describes the relationship between an atom and an element?
A) An element is the fundamental unit of an atom. B) An element is composed of atoms that are joined together by ionic and covalent bonds. C) An atom is composed of different elements that are joined together by ionic and covalent bonds. D) An atom is the smallest unit of an element that demonstrates all of the properties of that element.
What will happen to a long-day plant, such as spinach, if the light-dark pattern is interrupted by a flash of light for several days in a row during the spring?
A) The plants won't flower that season. B) The plants are tricked into flowering earlier than usual. C) Nothing will happen; growth and development will continue as normal. D) The plants will be delayed in flowering.