Which of the following is not true of
cladistics?
a. It involves making hypothesis about the
evolutionary relationship between clades.
b. It is a precise science.
c. It can lead to a cladogram.
d. It may involve parsimony analysis.
e. It may use outgroups to ‘root’ the tree
B
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Sulfonamides and other drugs that inhibit folic acid synthesis have a high therapeutic index because
A. humans synthesize folic acid by a process that is not sensitive to sulfonamides. B. humans do not use folic acid. C. humans do not synthesize folic acid but obtain it in their diets. D. None of these are correct.
Which of the following groups consists primarily of anaerobic organisms that cause disease?
a. Excavates b. Dinoflagellates c. Archaeplastida d. Diatoms e. Ciliates
Bacteria cannot be classified using the biological definition of a species for which reason?
A. The DNA sequences of all bacteria are more than 97% identical. B. Bacteria cannot reproduce. C. Bacteria are present everywhere and cannot be reproductively isolated from other bacteria. D. Bacteria are asexual. E. Bacteria do not evolve.
When a cell is placed in a hypertonic solution,
a. solute exits the cell to equalize the concentration on both sides of the membrane. b. water exits the cell toward the area of lower solute concentration. c. water exits the cell toward the area of higher solute concentration. d. there is no net movement of water or solute.