Why is acid rain or acid deposition more of a problem in certain areas, such as New England, than in others?
What will be an ideal response?
Prevailing winds carry nitrogen oxides and sulfuric acid to New England, where they combine with water vapor in the atmosphere to form nitric acid and sulfuric acid. The rocks and soils in New England are unable to neutralize the acid.
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T cell response to T-dependent antigens requires
A. binding of the T cell to a class II MHC receptor on a macrophage. B. typically a protein antigen. C. binding of the T cell to a site on the antigen. D. interleukin-1 activating the T helper cell. E. All of the choices are correct.
What structure forms a ring around the membrane pinching the cell into two separate cells?
a. myosin b. microfilaments c. troponin d. histones e. chromatin
Among dogs, short hair is dominant to long hair and dark coat color is dominant to white (albino) coat color. Assume that these two coat traits are caused by independently segregating gene pairs
For each of the crosses given below, write the most probable genotype (or genotypes if more than one answer is possible) for the parents. It is important that you select a realistic symbol set and define each symbol below. Parental Phenotypes Phenotypes of Offspring Short Long Short Long Dark Dark Albino Albino (a) dark, short × dark, long 26 24 0 0 (b) albino, short × albino, short 0 0 102 33 (c) dark, short × albino, short 16 0 16 0 (d) dark, short × dark, short 175 67 61 21 Assume that for cross (d), you were interested in determining whether fur color follows a 3:1 ratio. Set up (but do not complete the calculations) a Chi-square test for these data [fur color in cross (d)].
The diploid number of a roundworm species is 4. Assuming there is no crossover, and random segregation of homologues during meiosis, how many different possible combinations of chromosomes might there be in the offspring (not including variety
generated by crossing over)? A) 4 B) 8 C) 16 D) 64