Four of the five elements listed below are elements
whose symptoms of deficiency include chlorosis.
Select the exception.
a. phosphorus
b. iron
c. chlorine
d. copper
e. magnesium
Answer: a
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A muscle contraction where fibers cannot relax at all between stimuli is called
a. an action potential. b. a muscle twitch. c. fatigue. d. tetanus. e. constriction.
Steroid hormones
a. are proteins. b. include testosterone, estrogens, and cortisol. c. never activate second messengers. d. never alter membrane transport of ions. e. fit all of these descriptions.
In a 32-cell stage tunicate embryo, vegetal marginal cells that lack functional genes for both macho-1 and the FGF receptor would develop as what cell type?
A. Notochord B. Muscle C. Mesenchyme D. Nerve cord
Which species is best associated with an occipital bun?
A. Humans B. Neandertals C. Homo erectus D. Homo habilis E. Australopithecines