Which of the following is true concerning root
nodules?
a. They may kill a plant.
b. They are produced by a fungus.
c. They remove nitrogen compounds from the
plant.
d. They convert the harmful ammonia that
plant cells produce into gaseous nitrogen.
e. None of these are true
E
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Which of the following is NOT added to each of the 4 assay tubes when performing the dideoxy method for DNA sequencing?
A. many copies of target DNA B. primers C. DNA polymerase D. one of the 4 deoxynucleotides (radiolabeled) E. one of the 4 dideoxynucleotides
The simple plant tissues are __________,
__________, and __________. Fill in the blank(s) with the appropriate word(s).
In lactation, the more a baby suckles his mother's breast to obtain milk, the more milk is produced. This is an example of a
A. neutral feedback loop. B. negative feedback loop. C. positive feedback loop. D. stimulating feedback loop. E. None of these answers is correct.
An invertebrate biologist is conducting research with crabs. Her interest is ecdysis. This implies that she studies
A. tagmatization processes in crustaceans. B. how the HOX gene controls the fusion of the head and thorax into the cephalothorax. C. how ommatidia function individually in a compound eye. D. the molting process. E. how ocelli evolved from mere photoreceptors to imaging lens.