If the experimental population of E. coli lacks an F factor or F plasmid, and if bacteriophages are excluded from the bacterial cultures, then beneficial mutations might be transmitted horizontally to other E. coli cells via _____
A) sex pili
B) transduction
C) conjugation
D) transformation
D
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You are taking a lab practical exam. One station has a microscope slide of a cross section through an artery and vein. Which vessel is the artery?
A. the vessel with more muscle tissue and elastic fibers in its wall B. the vessel with valves to prevent backflow C. the vessel lined only with endothelium D. the vessel with a greater overall diameter E. the vessel with the wider lumen (e.g., interior space that contains the blood)
In a mature tree, the point where the bark can be peeled off the wood is where the ________ lies.
A. vascular cambium B. cork cambium C. periderm D. secondary xylem
Lichens are:
A) fungi adapted for life in rocky soil. B) algae-like fungi. C) fungi that grow on the roots of plants. D) a mutualistic association of algae or photosynthetic bacteria and fungi.
Many archaeal genomes include chromosomes and plasmids.
Answer the following statement true (T) or false (F)