One of the characteristics of chordates is the presence of pharyngeal slits. What was the function of this structure early in chordate history?
A. respiratory surface (gills)
B. jaw support
C. feeding
D. part of the jaw
C
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The defining characteristics of the phylum Arthropoda are:
A. jointed legs, ecdysis, and an exoskeleton B. antennae, six legs, and mandibles C. compound eyes, book lungs, and the hemocoel D. Malphigian tubules, ommatidia, and tagmata E. spiracles, cephalothorax, and proboscis
Archaeans resemble bacteria by the ____, and resemble eukaryotes by the ____
a. lack of membrane-bound organelles; presence of a nucleus b. presence of similar cell wall proteins; presence of similar rRNA sequences c. ability to perform aerobic respiration; presence of similar cell wall proteins d. lack of membrane-bound organelles; presence of introns e. presence of nucleoid region; lack of a nuclear envelope
Most monocots have numerous ____ roots
arising from the stem.
a. adventitious b. primary c. fibrous d. secondary e. tap
A friend tells you that her husband has been feeling
anxious for the past month. He has also felt fatigued most of the time, and his face is puffy. Doctors have already checked for ulcers, cancer, blood pressure changes, and other blood irregularities, but have found everything to be normal. You are an endocrinologist, so you suggest that he be tested for the most likely endocrine malfunction, which would be __________ levels. a. androgen/estrogen b. glucocorticoid c. calcitonin d. melatonin e. parathyroid