Which of the following is not a problem in applying the biological definition of species?
a. asexually reproductive organism
b. greenhouse hybrids
c. reproductive isolation from other species
d. self-fertilization
e. extinct organisms
C
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RNA can act like an enzyme
Indicate whether the statement is true or false
Male cockroaches with mutations that strongly decrease the function of an RTK called RTKX are oblivious to the charms of their female comrades. This particular RTK binds to a small molecule secreted by sexually mature females
Most males carrying loss-of-function mutations in the gene for Ras protein are also unable to respond to females. You have just read a paper in which the authors describe how they have screened cockroaches that are mutant in RTKX for additional mutations that partly restore the ability of males to respond to females. These mutations decrease the function of a protein that the authors call Z. Which of the following types of protein could Z be? Explain your answer. (a) a protein that activates the Ras protein by causing Ras to exchange GDP for GTP (b) a protein that stimulates hydrolysis of GTP by the Ras protein (c) an adaptor protein that mediates the binding of the RTKX to the Ras protein (d) a transcriptional regulator required for the expression of the Ras gene
Chemoautotrophs oxidize which of the following to obtain the energy necessary to reduce carbon dioxide to an organic compound?
A. ammonia B. hydrogen sulfide C. hydrogen gas D. nitrites E. All of the above.
Use the basic steps of the scientific method to describe Pasteur's experiments to investigate spontaneous generation
What will be an ideal response?