Gene targeting has been used in mice to produce strains that were either homozygous or heterozygous for ____
a. PKU
b. cystic fibrosis
c. Huntington's disease
d. sickle cell anemia
e. Tays Sachs Disease
b
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Robert Paine was the first biologist to use the term keystone species in the 1960s. He was
studying food webs in the rocky, intertidal pools in the Pacific Northwest. At one of his study
sites, the dominant organisms in the tidal pools were mussels, barnacles, whelks, and a species
of starfish known as Pisaster ochraceus. To examine the relationship between these species,
Paine set up an experiment. In one area, he removed all the starfish from the tidal pools, and
in an adjacent area, he left the tidal pools as he found them. Prior to removing the starfish, he
sampled all the organisms in each pool. After two months, he repeated this sampling. A
summary of his results is illustrated in the graph below.
The "Age of Fishes" is an informal name for the:a
Ordovician period. b. Silurian period. c. Devonian period. d. Permian period. e. Carboniferous period.
Muscles that encircle tubes and act as circular valves are called
A. sphincters. B. frenula. C. cannula. D. anastomoses. E. buccinators.
Glyceraldehyde 3-phosphate dehydrogenase operates by stripping a hydride ion from its substrate. Which molecule is the recipient of the proton and two electrons during this transfer?
(a) oxygen (b) acetyl CoA (c) NAD+ (d) FADH