Position effect variegation generally results from
a. a chromosome rearrangement that puts a gene in a region adjacent to heterochromatin.
b. a chromosome rearrangement with a breakpoint in the middle of a gene.
c. a chromosome rearrangement that puts a gene near a strong promoter.
d. point mutations in a gene.
e. transcription factors activating genes in some cells and not others.
Ans: a
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Euglena and dinoflagellates have chloroplasts and flagella. This indicates they are
A. multicellular. B. mobile. C. photosynthetic. D. photosynthetic and mobile. E. multicellular and mobile.
the prose Darwin used to describe his broad theory of evolution is "Descent with ---"
Fill in the blank(s) with the appropriate word(s).
Human cells have
a)23 pairs of chromosomes. b)23 chromosomes. c)46 pairs of chromosomes. d)2 pairs of sex chromosomes. e)one pair of autosomes.
The British Isles experience warmer weather than other areas of the same latitude because of
A. the vast forests that shelter the islands from winds. B. mountain ranges protecting the islands. C. industry causing a localized greenhouse effect. D. the warm, moist Gulf Stream.