Scientists are documenting the level of radiation in ____ forests along the western coasts of North America because
they tend to take up and concentrate radioactive material, making it easier to detect.
a. aspen
b. alder
c. Douglas fir
d. cedar
e. kelp
ANSWER: e
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Even though plants cells photosynthesize, they still use their mitochondria for oxidation of pyruvate. This will occur in _____
A) photosynthetic cells in the light, while photosynthesis occurs concurrently B) nonphotosynthesizing cells only C) cells that are storing glucose only D) all cells all the time E) photosynthesizing cells in the light and in other tissues in the dark
Bacteria are grown in 15N (heavy) medium and then transferred to 14N (light) medium and are allowed to replicate for 2 generations. The DNA is subsequently isolated and centrifuged in a CsCl2 gradient to yield what type of gradient band(s)?
A. one heavy band. B. one light band. C. one half-heavy (intermediate to heavy and light) band. D. one heavy and one half-heavy band. E. one light and one half-heavy band.
A 25-year-old woman is seen on an emergency basis while in shock, with generalized flushing of the skin and mucous membranes. A tampon is present in her vagina. Toxic shock syndrome is suspected. Which of the following mechanisms is responsible for the toxic shock syndrome?
A. Inhibition of acetylcholine release B. ADP ribosylation of ribosomal protein C. Stimulation of G protein D. Cross-linking of MHC II and TCR proteins E. Activation of adenylate cyclase
Which of the following choices lists in correct order the structures which a sound wave must vibrate in order to be sensed?
What will be an ideal response?