Members of which of the following phyla would exhibit ostia and an osculum?
a) Cnidaria
b) Cnetophora
c) Nematoda
d) Rotifera
e) Porifera
Answer: e) Porifera
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Strong chemical mutagens may be used to treat cancer cells. Is this a good or bad idea?
A. Good-kill those cancer cells as quickly as possible to cure the patient! B. Bad-these mutagens will also affect the non-cancerous cells, possibly leading to new cancerous states! C. Good and bad-they're very good at killing cancer cells, but depending on mode of administration, they could also be dangerous to non-cancerous cells. D. Bad-the cancer cells are already mutated. We don't want to mutate them more and make them more cancerous!
These are the only vertebrates in which blood flows directly from respiratory organs to body tissues without first returning to the heart.
A. Amphibians B. Birds C. Fishes D. Mammals E. Reptiles
In human females, one of the sex chromosomes is switched off during early development in a
phenomenon called a. karyotyping. b. X inactivation. c. X linkage. d. crossing over. e. SRY activation.
Acidimethylosilex fumarolicum can grow using ________ as a carbon source and energy source.
Fill in the blank(s) with the appropriate word(s).