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.
B. GDP would remain bound to Ras, thereby preventing Ras activation.
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Answer the following statements true (T) or false (F)
1. In the organismic model, communities are superorganisms. 2. A forest community consists of not only the trees and shrubs, but also the animals and microorganisms. 3. If one species in a community is very common this will increase measures species diversity. 4. The time hypothesis suggests communities diversify with age. 5. South Texas has the highest bird species richness in the continental United States.
A botanist brings you a leaf from a previously unknown species of plant. The shape of the leaf is eerily similar to a human hand, as if you had put your own hand down on green construction paper, and traced its outline. Starting from the petiole, veins branch out into each ‘finger’ of the leaf, with numerous smaller veins branching off within each finger. What is the most specific description you can assign to this leaf form?
a. compound b. palmately compound c. simple d. pinnately compound
The balance between photosynthesis and ________ is altered by the combustion of fossil fuels.
A. respiration B. decomposition C. sunlight D. growth
Which of the following is not part of a nephron?
A. proximal convoluted tubule B. ureter C. collecting duct D. loop of Henle E. glomerular capsule