During oogenesis meiosis results in _____
A) four equally sized cells that stop dividing in meiosis I
B) two equally sized cells that are both typically fertilized
C) two equally sized cells, but only one is typically fertilized
D) two or three small cells and one large cell that develops further if fertilized
Answer: D
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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
In mosses meiosis occurs in the
A. gametophytes. B. antheridia. C. sporophyte. D. archegonium.
Energy storage is the primary function of:
A) phospholipids. B) triglycerides. C) waxes. D) cholesterol. E) estrogen
Which situation would be most likely to form a fossil under normal environmental conditions?
A. A jellyfish that died in an estuary. B. A slug that died in leaf litter. C. A bird that died and fell to the forest floor. D. An elephant that died at the edge of a waterhole.