Most domesticated food crops come from which of the following plant groups?
A) mosses
B) gymnosperms
C) ferns
D) angiosperms
D
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The protein SOS is a guanine nucleotide exchange factor for Ras. SOS helps facilitate the exchange of GDP for GTP. What would be the effect of a mutation that inhibits the interaction between SOS and Ras?
A. GTP would remain bound to Ras, thereby keeping Ras constitutively active. B. GDP would remain bound to Ras, thereby preventing Ras activation. C. Ras would be more likely to hydrolyze GTP to GDP. D. There would be no effect.
In places where deposits of diatom shells have been lifted onto land by geological processes, people mine the resulting "diatomaceous earth.". Why?
What will be an ideal response?
All of the following hormones are secreted by organs of the digestive system and directly regulate digestive processes EXCEPT ________.
Fill in the blank(s) with the appropriate word(s).
Which of the following events would be controlled by an external signal?
A) Cell division. B) Prophase proceeds into metaphase. C) The chromosomes align at the equatorial plane before the cell begins anaphase. D) All of the DNA is copied before the cell enters into the G2 phase. E) All of these are controlled by an external signal.