Gonorrhea and syphilis are most commonly controlled by
A. fluoride treatment.
B. antibiotics.
C. pasteurization.
D. boiling water.
E. abstinence.
Answer: B
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The figure below illustrates that
A. genetic changes in an ancestral Pax6 gene contributed to the evolution of the mammal eye, while the Drosphilia eye arose independently.
B. most animal species have eyes with one photoreceptor and one pigment cell.
C. eye complexity has not significantly increased since the late Triassic when most modern insect families arose.
D. the retina and cornea developed first, but then were secondarily lost in insects such as Drosphilia.
E. although the mammal eye possesses more cell types and greater complexity than the Drosphilia eye, both arose from genetic changes to an ancestral Pax6 gene.
In cocker spaniels, black coat color (B) is dominant
over red (b), and solid color (S) is dominant over spotted (s). If two dihybrids (Bb Ss) are crossed, the most common phenotype will be a. black and solid. b. black and spotted. c. red and solid. d. red and spotted. e. none of these.
Darwin's observations led to his proposal that evolution occurred due to ____
a. acquired characteristics b. climatic changes c. natural selection d. migration e. interaction of species
A codon reads AUA. The anticodon that recognizes it is TAT. If false, make it a correct statement.
a. true b. false