The development of memory B cells in response to an antigen requires the secretion of ________ from ________ cells.
A) tumor necrosis factor- : natural killer cells
B) interleukin-2 : helper T cells
C) interleukin-2 : cytotoxic T cells
D) interleukin-6 : helper T cells
E) interferon-gamma : cytotoxic T cells
Ans: B) interleukin-2 : helper T cells
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The fruit wall, or pericarp, develops from the ____
a. ovary wall b. petals c. seed coat d. endosperm e. receptacle
The letter “E” above represents
a. uterus. b. ovary. c. vagina. d. urinary bladder. e. pelvic girdle.
The ____ generation is dominant in mosses, as it can live independently
a. haploid sporophyte b. haploid gametophyte c. diploid sporophyte d. diploid gametophyte e. triploid sporophyte
Which region of the frog blastula corresponds to the future dorsal side of the embryo?
A) morula B) primitive streak C) archenteron D) gray crescent E) blastocoel