How does an STR differ from one person to the next?
Answer: It differs in the number of times the sequence is repeated. (This creates repeat regions that differ in size. Size differences can be sorted out using gel electrophoresis.)
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In many cancers, the cancerous cells have fully active telomerase enzymes. Explain how this might play a role in
enabling cancer cells to keep rapidly dividing.
What will be an ideal response?A cat eats a bird, which ate a caterpillar that chewed on a weed. Which organisms are autotrophs? Which ones are heterotrophs?
What will be an ideal response?
In a population of plants with a diploid number of 12, a new individual appeared with a chromosome number of 24. If this organism could self-fertilize, forming offspring with the same number of chromosomes (24), scientists would consider this an example
of A) sympatric speciation. B) behavioral isolation. C) formation of a hybrid zone. D) reduced hybrid fertility.
Salvarsan was
A. used to treat syphilis. B. discovered in the mid 1900s. C. first discovered as a product of Penicillium notatum. D. discovered by Robert Koch. E. formulated from the red dye prontosil.