Which cell structure is an important agent in modern genetic engineering techniques?
A. ribosomes
B. capsules
C. plasmids
D. inclusions
E. mesosomes
Answer: C. plasmids
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The half-life of carbon-14 is 5730 years. Approximately how old is a fossil that contains .25g carbon-14 and .75g nitrogen-14?
A. 11,460 years B. 5730 years C. 17,190 years D. 22,920 years E. 28650 years
If the partial pressure of oxygen (pO2) in a man's blood plasma decreased below that in his red blood cells, what would be the result?
A. More oxygen would diffuse into his red blood cells and be transported throughout his body. B. Oxygen would diffuse out of his red blood cells, and less oxygen would be transported throughout his body. C. The concentration of oxygen would be the same in red blood cells and blood plasma.
Cyanobacteria are ____
a. chemoautotrophs only b. chemoheterotrophs c. photoautotrophs d. photoheterotrophs only e. chemoautotrophs and photoheterotrophs
The spiracle in conjunction with a ventral gill in skates and rays is an adaptation that allows them to:
a. be nekton. b. have a bottom existence. c. position their mouth ventrally. d. avoid detection by predators. e. filter feed on plankton.