The symplast:a
greatly increases the surface area of the root.
b. is a waterproof band surrounding the endodermis.
c. directs the movement of water from one cell's cytoplasm to the next through
plasmodesmata.
d. secretes suberin, which waterproofs the cells.
e. allows nutrient minerals to move against their concentration gradient.
C
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After growth in tissue culture, the infected cells lyse and the virus may be harvested from
A. the lysate, the liquid supernatant after centrifugation. B. the remainder. C. the quantal layer. D. the monolayer.
Bananas are propagated by
a. grafting. b. adventitious roots. c. tissue culture. d. treating banana tissues with colchicine. e. planting seeds.
By the eighth week in humans
a. the embryo looks distinctly human. b. the neural tube is complete. c. upper and lower limbs have formed, and individual fingers and toes have separated from each other. d. male or female reproductive structures are forming. e. all of these are true.
Telomerase is an RNA-containing enzyme that adds telomeric DNA sequences onto the ends of linear chromosomes
Indicate whether the statement is true or false