The most accurate nucleotide base composition of the DNA double helix is
A. G=A
B. T=C
C. T+A=C+G
D. T+G=A+C
E. A=U
D. T+G=A+C
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Jellyfish (cnidarians) and comb jellies are thought to be closely related. While both trap food, the mechanism by which they achieve prey capture is different. Which of the following statements reflects this difference?
A. Comb jellies use cilia to create small currents around their bodies to draw in prey; jellyfish catch prey opportunistically. B. Comb jellies use specialized cells derived from mesoderm-like tissues to chase prey; jellyfish catch prey opportunistically. C. Comb jellies have a sticky substance on their tentacles to trap prey; jellyfish have nematocysts to sting and immobilize prey. D. Comb jellies have a stomach to digest and absorb prey; jellyfish have a stomach and a rudimentary intestine to digest and absorb prey.
Males that tend to be taller than average and show mild mental impairment may have
a. XXY chromosomes. b. XYY chromosomes. c. Turner syndrome. d. Down syndrome. e. Klinefelter syndrome.
A ____________ is an abnormally growing mass of cells that is actively spreading through the body.
Fill in the blank(s) with the appropriate word(s).
Which of the following organs of the endocrine system secretes thyroxine and calcitonin?
a. pituitary gland b. pancreas c. hypothalamus d. adrenal glands e. thyroid gland