Studies, such as clinical trials, that are completely randomized so that neither the physicians nor the patients know who is receiving an experimental drug are called ________
A) placebo studies
B) homeopathic medicine
C) regenerative medicine
D) double-blind trials
E) None of these choices
D
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Radiolarians have characteristic ____, which are thin, ray-like strands of cytoplasm supported internally by bundles of
____.
a. axopods; microfilaments b. axopods; microtubules c. spicules; microfilaments d. spicules; microtubules
e. microfilaments; axopodsWhich feature is common to the hagfish, lamprey, cartilaginous fish, and amphibians?
a. Bony appendages b. Swim bladder or lungs c. Jaws d. Backbone e. Braincase
Land plants are thought to have arisen most directly from a(n) red algal ancestor
___________________ Indicate whether the statement is true or false.
Choose the letter of the best match from the following:A. abscisic acidB. auxinC. ethyleneD. cytokininE. gibberellinIts defoliant effects were first noticed when it leaked from gas lights; later found to be produced by plants themselves.
Fill in the blank(s) with the appropriate word(s).