Which of these images represents the position of the Earth during the December solstice?
a. A only
b. B only
c. C only
d. D only
e. A and C
C
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Half the trees in an orchard were derived from rootstock "A" and half from rootstock "B," but all the trees had the same scion. If the trees grafted onto rootstock "A" were infected by a parasite that causes blossom rot, the trees grafted onto rootstock
"B" A) would be less likely to become infected because they're grafted onto different rootstocks. B) would be more likely to become infected, since the pathogen would spread through the soil to the roots of other trees. C) would be very likely to become infected, because the remaining scions are genetically identical to those that are already infected. D) There's no way to determine the likelihood of infection, since genetic variability gives all the trees different characteristics.
The R-group, or side chain, of the amino acid serine is -CH2-OH. The R-group, or side chain, of the amino acid leucine is -CH2-CH-(CH3)2. Where would you expect to find these amino acids in a globular protein in aqueous solution?
A) Serine would be in the interior, and leucine would be on the exterior of the globular protein. B) Leucine would be in the interior, and serine would be on the exterior of the globular protein. C) Serine and leucine would both be in the interior of the globular protein. D) Serine and leucine would both be on the exterior of the globular protein.
Species that determine the structure of communities are called
a. climax. b. keystone. c. transitional. d. crucial. e. pioneer.
The genus of bacteria that undergoes cell division in random planes, forming grapelike clusters of round bacteria, are the ________.
What will be an ideal response?