What causes the inactivation of a G protein?
A. The alpha subunit hydrolyzes GTP to GDP
and inorganic phosphate.
B. The beta and gamma subunits trigger the
hydrolysis of GTP to GDP.
C. A phosphatase removes the inorganic
phosphate group from GTP.
D. The inactive receptor catalyzes the
replacement of GTP by GDP.
A
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Salamanders normally go through a juvenile stage in which they have external gills. Most salamanders lose these gills when they develop into adults, but axolotl salamanders retain gills into adulthood by suppressing metamorphosis. This is an example of
A. gene duplication. B. co-opting a gene for a new function. C. homeosis. D. heterochrony. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about heterochrony? Consider Possibilities · Consider the different answer options. Which can you rule out? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
A cell with three pairs of chromosomes has the genotype Aa Bb Cc, with each locus on a different chromosome. If this cell were to undergo mitotic division, how many genetically different types of daughter cells could be produced?
A) 1 B) 3 C) 6 D) 8 E) 9
A seed that lands in the forest soil is homozygous mutant for the LEAFY (LFY) gene, and as a result does not produce any functional LEAFY protein. What do you predict will happen during the development of this seed?
A. It will fail to germinate. B. It will germinate and grow vegetatively. It will only develop flowers if it is from a species regulated by the autonomous flowering pathway. C. It will germinate and immediately produce flowers. D. It will germinate and grow vegetatively, but will never produce flowers.
You want to study an aspect of the mosaic theory of coevolution and you are looking for a suitable study sys-tem. Which of the following is the most important condition that your study system needs to fulfill?
a. It needs to involve an insect plant interaction. b. It needs to be a case of coevolution. c. The system must be organized as a true metapopulation. d. Coevolution is largely independent in different subpopulations.