Members of this Lophotrochozoan phylum are acoelomate and dorsoventrally flattened. They do not
have circulatory or respiratory systems.
a. Rotifera
b. Mollusca
c. Platyhelminthes
d. Annelida
e. Nemertea
C
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A nonnative species accidentally introduced into Lake Erie, ____ inadvertently helped restore the polluted lake by eating phytoplankton.
a. mayflies b. oligochaete worms c. phytoplankton d. salmon e. zebra mussels
Mutations that completely abolish the function of a wild-type allele are
A) null mutations. B) hypomorphic mutations. C) hypermorphic mutations. D) conditional mutations. E) neomorphic mutations.
Recombinant DNA technology can be used to make which of the following?
A)Vaccines B)Human hormones C)Drugs D) all of the above
Which of the following can be used to distinguish between a bacterial cell and an archael cell?
A. The presence of a plasma membrane B. The presence of a nucleus in the cell C. The presence of ribosomes in the cell D. The presence of peptidoglycan in the cell wall E. Answers A and C are correct F. Answers B and D are correct G. Answers A, B, and C are correct