Which statement regarding myelogenous leukemias is true?
A. They originate from a common colony-forming cell line.
B. They originate from a common myeloid precursor cell.
C. They originate from a common erythroid precursor cell.
D. They originate from a common megakaryoc
Answer: B. They originate from a common myeloid precursor cell.
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If you observed two female redback spiders, one having 10 offspring and the other 50, what could explain the difference?
A. The female with more offspring ate her mate and was therefore better nourished. B. The female with fewer offspring has a virus. C. The female with more offspring has more estrogen. D. The female with fewer offspring received more sperm from fewer males. E. The female with more offspring is a better hunter.
Antibodies perform all of the following functions EXCEPT ____
a. activate complement b. provide protection in secretions c. directly destroy and remove foreign antigens d. act as B cell receptors e. bind and neutralize blood toxins
Segments of DNA that increase the rate of transcription of certain genes are known as ________
A) enhancers B) polymerases C) short tandem repeats D) introns
A population has a size of 10,000 individuals, and only 5% of the males successfully mate in any generation. Its response to drift would depend on:
a. the effective population size. b. the population size. c. the strength of drift. d. the strength of selection. e. the inbreeding coefficient.