What hormone helps with adaptation to long term stress?
A. Epinephrine
B. Insulin
C. Melatonin
D. Glucocorticoids
E. Glucagon
Answer: D
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All of the following characteristics are shared between plant and animal development except that in animals, but not plants, _____
A) gene expression in developing embryonic tissues is closely regulated B) orientation of cells and tissues is critical for proper development C) differentiation of cells is directed and maintained by cascades of molecular signals D) once animal cells are differentiated, they cannot de-differentiate and redifferentiate
A single, weak contraction of a muscle fiber is called
a. an action potential. b. a muscle twitch. c. fatigue. d. tetanus. e. constriction.
Scientists may compare similarities between nucleotide sequences of organisms to determine their evolutionary
history. This is known as: a. cladistics. b. phenetics. c. synapomorphy. d. molecular systematics. e. monophyletic grouping.
According to the fossil record, the oldest vascular plants are placed in which phylum?
a. Rhyniophyta b. Bryophyta c. Anthocerophyta d. Pteridophyta e. Lycopodiphyta