Supercoiling has been observed in:
A. chromosomal DNA.
B plasmid DNA.
C. genomes of double-stranded DNA viruses.
D. most circumstances where double-stranded DNA is present in the cell.
E. most circumstances of double-stranded cellular DNA, but not double-stranded viral DNA.
D
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Chromosomes are replicated during the ______ phase.
A. G1 B. G2 C. S D. M E. meta-
After giving birth, female bighorn sheep lick their newborn lambs. This behavior continues off and on for up to 6 hours, after which mothers no longer lick their lambs. What is/are the ultimate cause(s) of this behavior? Check all that apply.
_____ Hormones released during labor stimulate motor neurons in female bighorn sheep, causing them to lick and groom their lambs. _____ The lamb is stimulated by the licking to begin nursing from its mother and the sooner a lamb begins nursing, the better its chances for survival. _____ Female bighorn sheep remember being licked by their mothers and know they must teach this behavior to their own offspring. _____ Licking the lamb removes excess moisture from its coat, preventing hypothermia. _____ When licking the lamb, the mother learns its unique scent so she can distinguish it from other lambs and offer it protection from predators or extreme weather.
Widmanstätten patterns are found in ____________ meteorites
Fill in the blank(s) with correct word
In which of the following cases will a Barr body be seen?
A) only XX B) XY C) XO D) only XXY E) both XX and XXY