Tracers are elements that
a. are used in minute amounts in plants.
b. can be monitored through biochemical reactions.
c. must be inert.
d. have an unbalanced electrical charge.
e. must have a stable nucleus.
Answer: b
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Substance B is synthesized in neurons, travels through gap junctions, and triggers the transduction of an
electrochemical signal. This is an example of ____.
a. autocrine signaling b. paracrine signaling c. long-distance signaling d. local signaling e. communication by direct contact
Which organism is used in the genetic engineering of plants?
a. E. coli b. T. aquaticus c. A. tumefaciens d. P. flourescens e. B. thuringiensis
The same bees that pollinate the flowers of the Brazil nut trees also pollinate orchids, which are epiphytes (in other words, plants that grow on other plants); however, orchids cannot grow on Brazil nut trees. These observations explain _____
A) the coevolution of Brazil nut trees and orchids B) why Brazil nut trees do not set fruit in monoculture plantations C) why male orchid bees do not pollinate Brazil nut tree flowers D) why male orchid bees are smaller than female orchid bees
Meiosis is a process that produces
a)sperm cells. b)begg cells. c)gametes. d)haploid cells. e)All answers are correct.