Unique features of the planctomycetes include ________.
A. their size: some are as large as protozoa
B. twitching fimbriae that are required for motility
C. a membrane-bound nuclear region
D. resistance to ionizing radiation
Answer: C
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In contrast to a G protein-linked receptor and an enzyme-linked receptor, a channel-linked receptor:a
is located on the cell surface. b. is composed of seven alpha helices. c. couples signaling molecules to signal transduction pathways. d. is a ligand-gated channel. e. functions as a tyrosine kinase.
In eukaryotic cells, transcription cannot begin until _____
A) the two DNA strands have completely separated and exposed the promoter B) several transcription factors have bound to the promoter C) the caps are removed from the mRNA D) the DNA introns are removed from the template E) DNA nucleases have isolated the transcription unit
Under the "business as usual" model of climate change, will temperatures change uniformly across the globe?
Examine Figure 48.7 in your text and compare the projected change in temperature in central South America and central Africa at the equator (draw an imaginary line across the globe at its widest point and examine a spot in the middle of each continent along that line). Which of the following best describes the predicted changes? A. Central South America will warm by an average of 7–8 degrees; central Africa will warm by around 3–4 degrees. B. Central South America will warm by an average of more than 8 degrees; central Africa will warm by 1–2 degrees. C. Central South America will remain about the same; central Africa will warm by 7–8 degrees. D. Central South America will warm by 2–3 degrees; central Africa will not change. E. Both central South America and central Africa will warm by 4–5 degrees.
One of the earliest antimicrobials isolated from a bacterium was
A. penicillin. B. ampicillin. C. Salvarsan. D. streptomycin.