One method for detecting tumors in body tissue involves the use of radioactive materials to create three-dimensional images showing metabolic activity of a specific tissue. This technique is referred to as
A) magnetic resonance imaging.
B) positron-emission tomography.
C) mammography.
D) electrophoresis.
E) photodynamic therapy.
B
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What do the two daughter cells generated by the first asymmetric division of the plant zygote become?
A. the suspensor and the embryo B. the epicotyl and the hypocotyl C. the root and the shoot D. the egg and pollen E. the xylem and the phloem
Which of the following parts of a brown alga do(es)
NOT have a counterpart in land plants? a. blade b. stipe c. float d. holdfast e. all of these
Reznick and Endler were interested in the effects of
__________ on guppy evolution. a. predation b. competition c. population density d. density-independent factors e. mating rituals
Protozoan cysts are resistant to many disinfection methods.
Answer the following statement true (T) or false (F)