The plant movement in the accompanying figure is caused by ____
a. auxin differences in two sides of the stems
b. gibberellin released in one side of the leaf
c. abscisic acid in two sides of the stems
d. salicylic acid in two sides of the roots
e. cytokinin differences in two sides of the stem
ANSWER: a
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DNA replication is bidirectional in prokaryotes with circular chromosomes
Indicate whether the statement is true or false.
One day after a biology class four of your friends argue about the difference between phylogeny and systematics. Which friend is right?
A. Friend A states that systematics and phylogenies are really the same, one is more recent than the other, but basically they are the same. B. Friend B says that systematics is the same as cladistics and cladistics is reconstructing clades, which ultimately lead to the development of phylogenies. C. Friend C argues that systematics is the actual collecting and cataloguing of specimens into museums that can be used later by scientists to construct clades and phylogenies. D. Friend D says that the way she remembers is that systematics is the reconstruction and study of phylogenies.
According to the selfish DNA hypothesis, which symbiotic relationship most closely resembles that of transposable elements that move within the organism’s genome without preventing survival of the organism?
A. mutualism B. commensalisms C. parasitism D. competition E. neutralism
A family pedigree is used to assemble information about the occurrence of heritable characters in parents and their offspring across several generations.
a. true b. false