Human insulin for diabetics is now produced by transgenic ________
a. yeast
b. E. coli
c. jellyfish
d. cattle
b
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Starling's law of the heart states that the heart pumps:a
more forcefully when more blood is delivered to it. b. more rapidly when less blood is delivered to it. c. less forcefully when oxygen-rich blood is delivered to it. d. slower when more blood is delivered to it. e. slower when norepinephrine is secreted.
Avery, MacLeod, and McCarty (1944) demonstrated that DNA was the genetic material by treating heat-killed Streptococcus pneumoniae S (smooth) strain with DNase,
thereby preventing transfer of the "transforming substance" from the killed S strain to the live R (rough) strain when the two were mixed together and injected into mice. Another way that one could demonstrate transformation in bacteria would be to extract DNA from A) an R strain and mix it with cells of an S strain. B) both S and R strains and mix it to allow recombination to take place. C) an ampicillin-sensitive strain and mix it with cells of an ampicillin-resistant strain. D) an S strain and mix it with cells of an R strain. E) None of the above are correct.
What global climatic change gave gymnosperms an advantage over ferns?
A) the climate becoming hotter and wetter B) increased fluctuations in global climate temperatures C) the climate becoming cooler and drier D) the climate becoming hotter and drier
The carbohydrate that plants use to store energy is called:
A. cellulose B. starch C. fructose D. sucrose E. chitin