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

Biology & Microbiology

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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.

Biology & Microbiology

Which term refers to the DNA sequence onto which proteins and enzymes bind to initiate transcription?

a. Promoter b. Intron c. Polymerase d. Exon

Biology & Microbiology

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

Biology & Microbiology

What anaerobic excavate protist, including diplomonads and parabasalids, have multiple flagella and no mitochondria?

A. Metamonads B. Phytoplankton C. Trypanosome D. Excavates E. Amoeba

Biology & Microbiology