Fast-growing algae are prevented from out competing corals due to:
a. low nutrients inhibiting their growth.
b. grazing on algae by herbivores.
c. sensitivity to pressure increasing with depth.
d. damselfish activity.
e. b and d
E
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When Lactobacillus acidophilus are sprayed on feed, the cattle that eat it appear to have markedly lower carriage of the pathogenic E. coli strain O157:H7.
Answer the following statement true (T) or false (F)
met refers to a gene that governs a cells ability to synthesize methionine from inorganic precursors
The designation met- indicates:
a. that the allele is normal. b. that the allele is the mutant allele. c. that the bacterium is biologically active. d. that the bacterium is biologically inactive. e. that the bacterium can make its own methionine.
In Figure 43-3, the vestibular canal is labeled:a
1
b. 2
c. 3
d. 7
e. 8
Members of the genus ________ may cause epiglottitis and middle ear infections.
A. Pasteurella B. Haemophilus C. Salmonella D. Enterobacter E. Yersina