Gene duplications may be caused by
A. the crossing over of misaligned chromosomes
B. deletion of important genetic information.
C. reciprocal translocations.
D. position effect.
E. None of the answers are correct
A
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The plant hormone ____ is primarily responsible for the bending of a plant shoot toward light
a. auxin b. ethylene c. systemin d. salicylic acid e. brassinosteroid
Like bacteria, yeasts grow easily in culture. But why are they regarded as more useful for recombinant DNA technology?
a. They are more stable in culture than prokaryotes because they are not prone to bacteriophages. b. They are virtually harmless to humans so they are less risky to work with than prokaryotes. c. Because yeasts are eukaryotic, they exhibit post-transcriptional mRNA editing not performed by any prokaryotes such as Escherichia coli. d. They have longer lifespans so they do not have to be split and recultured as often.
Once urine has formed in the kidney it flows into the
a. urethra. b. bladder. c. pelvic cavity. d. rectum. e. ureter.
Water molecules are polar, with
a) the oxygen side being slightly positive and the hydrogen side being slightly negative. b) the oxygen and hydrogen sides being slightly positive. c) the oxygen and hydrogen sides being slightly negative. d) the oxygen side being slightly negative and the hydrogen side being slightly positive.