For a typical flowering plant, the first cell of the triploid (3n) endosperm is formed from ____
a. one sperm fused with two antipodal cells
b. two sperm fused with the egg
c. one sperm fused with the synergid
d. one sperm fused with the endosperm mother cell
e. two sperm fused with a synergid
ANSWER: d
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All the body fluid located outside of cells is
(a) interstitial fluid. (b) plasma. (c) intracellular fluid. (d) extracellular fluid.
To industrial microbiologists, fermentation means the mass culture of microorganisms.
Answer the following statement true (T) or false (F)
Which of the following will NOT develop into a gamete?
a. spermatogonium b. polar bodies c. oocyte d. spermatid e. secondary spermatocyte
Notch and Delta are both transmembrane proteins involved in cell communication in the developing nervous system of vertebrate animals. What makes Notch different from Delta?
A. Notch is a receptor and Delta is a signaling molecule. B. Notch is a signaling molecule and Delta is a receptor. C. Notch is required at higher density than Delta to alter cell fate. D. All of the above statements are correct.