The union of the sperm and the egg that results in a cell with 46 chromosomes is called a(n) ________
A) embryo
B) zygote
C) fetus
D) trophoblast
B
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Generally, the smaller the infective dose, the lower the chance of disease
Indicate whether this statement is true or false.
The owner of a plant nursery is introducing the new night janitor to his duties. "Behind this door are the poinsettias," she said, "Please don't clean this room, and leave the door closed." Why might the owner say this?
A. Poinsettias are long-day plants that require a long period of light for flower formation, and this light might disrupt the day-night cycles of other plants outside the room. B. Poinsettias are tropical plants and require constant warm temperatures for flower formation. C. Poinsettias are very sensitive to the chemicals used in cleaning, which can interfere with the gibberellin-dependent pathway and disrupt flowering. D. Poinsettias are short-day plants that require a long uninterrupted period of darkness to flower. Even a short flash of light at night could prevent flowering.
Why does planting a cover crop help conserve soil?
I) controls weed populations II) reduces soil loss due to wind and water erosion III) increases soil nutrients when plowed under and allowed to decompose A) only I B) I and II C) II and III D) I, II, and III
The termination phase of cell signaling requires which of the following?
A) removal of the receptor B) activation of a different set of relay molecules C) converting ATP to camp D) incompatibility of the binding of the signal molecule to the receptor E) apoptosis