Friedrich Miescher, after he began to study the chemical composition of the nucleus, was one of the first to ____
a. propose the nuclear structure of the H5N1 virus
b. discover that the nucleus contained DNA but no proteins
c. discover that human and mice chromosome chemistry differs greatly
d. isolate DNA and propose its structure
e. isolate and purify a cellular organelle
e
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A farmer performs truncation selection to try to increase the weight of peaches in his orchard. Which statement correctly describes a possible outcome of this selection?
A) If peach weight is not heritable, the average weight in the next generation will increase. B) If peach weight is heritable, the average weight in the next generation will increase. C) The average peach weight will decrease due to this inbreeding. D) If peach weight is heritable, the average weight in the next generation will decrease.
During gastrulation, three tissue layers form: the outer __________, the inner __________, and the __________ in
between the first two layers. Fill in the blank(s) with the appropriate word(s).
In an infertile cycle, the endometrium is shed primarily because blood levels of ______ decline.
A. fertilin B. follicle-stimulating hormone C. progesterone D. testosterone
Is cellular respiration an endergonic or an exergonic reaction?