When a gene is uninterrupted, __________
a. it does not get expressed
b. the restriction map of its DNA corresponds exactly with the map of its mRNA
c. the restriction map of its DNA and mRNA are different, except at each end
d. the restriction map of its DNA and mRNA are different throughout both sequences
e. None of the above
Ans: b
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The direction of expansion for a plant cell is determined primarily by ____
a. location of the cell plate b. the direction of cell division c. the direction to the nearest meristem d. orientation of cellulose microfibrils e. gravity
A(n) ____ contains pluripotent stem cells
a. embryo before implantation in the uterus b. embryo shortly after implantation in the uterus c. placenta d. umbilical cord e. uterus
The cells that line the inside of the blastopore become the
A) nervous system. B) muscles. C) skin. D) skeleton. E) digestive tract.
Which one of the following causes transmembrane channels in target cells?
A) granzymes B) hapten C) IL-1 D) IL-2 E) perforin