There are tubeworms and clams that live at the bottom of the ocean near thermal vents that do not have direct access to sunlight so they derive their energy from
A. sources not yet known.
B. the sun by way of burning fossil fuels like we do with coal and oil.
C. the sun, but they are deep in the dark ocean and live off dead detritus that sink to them.
D. chemosynthetic bacteria.
Answer: D
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Forensic technicians unearth a skeleton from a shallow grave. They extract a tiny amount of DNA from the pulp found in the teeth. How could they obtain sufficient DNA for an analysis of the victim's genes?
A. Subject the DNA to gel electrophoresis. B. Use a nucleic acid probe. C. Subject the specimen to amniocentesis. D. Use the polymerase chain reaction. E. Subject the DNA to restriction enzymes.
Thatch palm and curly palm are thought to have diverged from an ancestral species by ________
a. temporal isolation b. gamete incompatibility c. mechanical isolation d. hybrid inviability
Chytrids are unique among fungi because they are the only ones that have ________
a. symbiotic relationships in lichens b. flagellated cells c. zygospores d. sexual reproduction
Whatever the motivation of self-sacrificing behavior
on the part of nonhuman animals is, we have no evidence that it is a. genetic. b. the result of selection. c. derived from conscious reasoning. d. a result of dominance hierarchy. e. related to species-survival strategies.