In biology lab, you observe lumps of plant tissue. Your instructor tells you that they have been grown artificially and can produce new plants. Each lump is a(n)
A. scion.
B. stigma.
C. tetraploid zygote.
D. callus.
E. amnion.
D. callus.
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Interference RNA technology is one of the most exciting new developments in genetics in recent years
In April 2004, Cancer Research UK and the Netherlands Cancer Institute announced creation of a 24,000-molecule iRNA library, designed to inactivate about 8,000 human genes. One hope for this library is its application in combating cancer. How might iRNA be implemented in cancer treatment?
A woman has six sons. The chance that her next child will be a daughter is
A) 1. B) 0. C) 1/2. D) 1/6. E) 5/6.
Turgor pressure is observed when a plant cells environment is ________.
A. hypotonic B. osmosis C. hypertonic D. isotonic
DNA gyrase
A. unwinds DNA. B. supercoils DNA. C. joins free DNA ends. D. cleaves DNA.