Diploblastic animals, such as cnidarians and __________, have only two germ layers, ectoderm and
__________.
a. sponges; ectoderm
b. sponges; mesoderm
c. ctenophores; mesoderm
d. ctenophores; endoderm
e. ctenophores; metaderm
D
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A fisherman who cut himself on a fishing hook later develops a cutaneous disease at the inoculation site. The exudate is aspirated and set up on a routine AFB medium for culture. It is incubated at 37°C, but no growth is observed after 8 weeks; however, a slide of the exudate was AFB-positive. Which one of the following statements explains these findings?
a. The infection is most likely the result of a viral infection. b. The organism should have been incubated at 30°C. c. The organism should have been incubated at 42°C. d. The infection is most likely fungal in na-ture.
Identify two important proteins that are produced using genetic engineering techniques. Briefly discuss
why the genetic engineering techniques used are preferred over the other methods of producing each of the proteins that you identified What will be an ideal response?
Ribosomal RNA
a. covalently binds amino acids. b. contains an anticodon. c. is produced in the nucleolus of the nucleus. d. assists in DNA replication. e. has no known function in the cell.
______ are the only active biological agents lacking any nucleic acid (DNA or RNA).
A) Viriods B) Prions C) Satellite viruses D) Virions B) Prions How do