An ion is:
a. a type of gas.
b. an individually charged particle.
c. heavy water.
d. water with an extra hydrogen atom.
e. a neutrally-charged atom.
B
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________, periodic reports on the susceptibility of clinically isolated organisms to the antibiotics in current local use, are particularly valuable for tracking the emergence of new antibiotic-resistant strains of pathogens
A) Antibiotic susceptibility plates B) Antibiograms C) Direct agglutination reports D) Histograms
The accumulation of traits that increase the relative fitness of organisms in their environment over time results in
____.
a. mutation b. adaptation c. heterozygote advantage d. homozygote advantage e. diploidy
Occasionally the testes do not descend into the
scrotum as they should in a newborn. If this is not corrected surgically, a. sperm production will be affected. b. achieving an erection will not be possible. c. the child will have female characteristics. d. growth will be stunted. e. the child will not live.
If the figure above is an accurate depiction of relatedness, then which of the following should be correct?
1. The entire tree is based on maximum parsimony. 2. If all species depicted here make up a taxon, this taxon is monophyletic. 3. The last common ancestor of species B and C occurred more recently than the last common ancestor of species D and E. 4. Species A is the direct ancestor of both species B and species C. 5. The species present at position 3 is ancestral to C, D, and E. A) 1 and 3 B) 3 and 4 C) 2, 3, and 4 D) 1, 2, and 3