The fungus that produces penicillin belongs to which of the following groups?
A. ascomycetes
B. basidiomycetes
C. chytrids
D. glomeromycetes
E. zygomycetes
A
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____ is an interaction in which individuals require the same resource, and therefore the availability of that resource is lowered
Fill in the blank with the appropriate word.
Which of the following is true of Agrobacterium tumefaciens?
A. It can enter plants through unbroken leaf tissue. B. It is capable of nitrogen fixation. C. It causes crown gall disease when it carries a tumor inducing (Ti) plasmid. D. All of the choices are correct.
In a developing embryo, different cells begin to transcribe different master genes, depending on where they fall within a gradient of ________
a. protein products of embryonic mRNAs b. homeodomains c. temperature d. protein products of maternal mRNAs
Why is it more difficult to treat viral infections than it is to treat bacterial infections?
a. Viruses are very similar to human cells. b. Viruses have cell walls. c. Viruses are smaller than human cells. d. Viruses use the host cell's processes to carry out their own reproduction.