Desulfovibrio bacteria can perform the following reaction: S6- S2-. These bacteria are
a. Synthesizing sulfur.
b. Reducing sulfur.
c. Hydrolyzing sulfur.
d. Oxidizing sulfur.
Ans: d. Oxidizing sulfur.
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Respiratory surfaces in all vertebrates have
A. moist epithelia. B. large surface areas. C. thin epithelia. D. a very high degree of vascularization. E. All of the answers for this question are correct.
Extracts of pathogenic bacteria can transform harmless bacteria to harmful bacteria unless ____ enzymes are added to
the extract.
a. protein transfer b. mRNA-degrading c. tRNA-degrading d. DNA-degrading e. nucleic transfer
Which of the following is a secondary sexual trait?
a. ovulation in females b. production of semen in males c. facial hair in males d. ovaries in a female e. testes in males
Unique features of vertebrates include the presence of a(n) ________
A) endoskeleton B) notochord C) skull and a backbone D) pharyngeal slit