Which statement best describes the action of polypeptide growth factors?
A) They bind to intracellular receptors and trigger intracellular signal transduction pathways.
B) They bind to cell surface receptors and trigger intracellular signal transduction pathways.
C) They bind to cell surface receptors that phosphorylate cyclins.
D) They bind an intracellular receptor forming a complex that then acts as a transcription factor.
B) They bind to cell surface receptors and trigger intracellular signal transduction pathways.
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In terms of alternation of generations, the internal parts of the pollen grains of seed-producing plants are most similar to a _____
A) moss sporophyte B) moss gametophyte bearing both male and female gametangia C) fern sporophyte D) hermaphroditic fern gametophyte E) fern gametophyte bearing only antheridia
Differences in plant flower color or plant height are called a variant of a trait
Indicate whether the statement is true or false
Which area of biology states that living things undergo gradual structural and functional changes over long periods of time?
A. Evolution B. Genetics C. Transformation D. Morphology E. Phylogeny
What legal restrictions on the use of PGD are in place in the United States?
A. It has been banned across the board. B. It can only be used to prevent implantation if the disease diagnosed has a 100 percent chance of occurring with the genotype revealed. C. It cannot be used for sex selection. D. It cannot be used for screening embryos to be tissue donors. E. None of these are legal restrictions currently in place in the United States.