The deleted portions of the mRNA are called
A. Exon
B. Replicon
C. Internal
D. Intron
E. External
Answer is D. Intron (The noncoding regions)
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Which of the following occurs during metaphase
A. heterochromatin is converted to euchromatin. B. chromosomes are about 30 nm wide. C. chromosomes are much shorter than they were in interphase. D. chromosomes undergo gene transcription. E. the "beads on a string" structure is visible.
Probes for cloned genes use
a. complementary nucleotide sequences labeled with a tracer b. specific antibodies that kill all the cells except those that have incorporated the genes. c. specific enzymes that lyse all the cells except those that have incorporated the genes. d. certain bacteria that glow when they take up the genes. e. all of these.
Which of the following structures places a fish in the class Actinopterygii?
a. swim bladder b. pharynx with gills c. nerve chord d. pelvic fin e. dorsal fins
The splitting of water and the generation of oxygen occur where?
A. The Krebs Cycle B. Photosystem I C. The Calvin Cycle D. Photosystem II