Microorganisms may aggregate and glue themselves to teeth to form dental plaque. This is an example of:
A. a biofilm
B. a dentifrice
C. halitosis
D. a dontoid layer
E. annealed enamel
A. a biofilm
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Experiments with ribbon worms and planaria have shown that
A. it is easy to hybridize the two species in nature. B. Pax6-related genes are not always required for eye regeneration. C. the DNA of each is sufficiently similar that they can be hybridized in a lab setting. D. their eyes are examples of convergent evolution.
Which term refers to the DNA sequence onto which proteins and enzymes bind to initiate transcription?
a. Promoter b. Intron c. Polymerase d. Exon
What advantage is associated with human testes located in an external sac rather than in the abdominal cavity?
A) a shorter distance that semen must travel during ejaculation B) the testes can be kept at a constant temperature C) the testes can be kept cooler than the body's interior D) the testes can enlarge at sexual maturity
What anaerobic excavate protist, including diplomonads and parabasalids, have multiple flagella and no mitochondria?
A. Metamonads B. Phytoplankton C. Trypanosome D. Excavates E. Amoeba