The polarity of DNA synthesis is
A) 5'?3'.
B) 3'?5'.
C) 5'?2'.
D) 2'?5'.
A) 5'?3'.
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Explain why the discovery of iron-oxidizing phototrophs has important implications for both understanding the evolution of photosynthesis and explaining the large deposits of ferric iron (Fe3+) found in ancient sediments on Earth
What will be an ideal response?
Kinesis is
A. a movement toward a stimulus. B. a movement away from a stimulus. C. any movement in response to a stimulus, but not necessarily toward or away. D. a movement. E. any movement away from an object.
Linked DNA segments from humans and vectors, such as plasmids, are called
____________________ molecules. Fill in the blank(s) with the appropriate word(s).
Disadvantages of continuous cell cultures include
A. they only grow for a limited number of generations. B. the expense of preparation. C. they may be significantly different genetically from the original source animal. D. viruses do not reliably infect them. E. they are both expensive and have a limited number of divisions.