What structure is responsible for physically organizing the events of the cell?
What will be an ideal response?
cytoskyleton
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What would result if an error inside gastrulation caused too few cells inside the archenteron?
A. Too little endoderm, resulting in missing gut and organs B. Too little ectoderm, resulting in missing nervous system or skin C. Problems in muscle development D. Too little protoderm, resulting in missing organs Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about the fate of the archenteron? What other information is related to the question? Choose Answer Given what you now know, what information 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?
Sexual dimorphism has arisen as a result of
a. stabilizing selection. b. heterozygote superiority. c. kin selection. d. sexual selection. e. directional selection
Which of the following responses involves the activation of ion channels?
a. Ras pathway activation of microfilament assembly in neutrophils b. steroid hormone regulation of gene expression c. Ras pathway activation of genes for cell division d. peptide-stimulated assembly of microtubule assembly in neutrophils e. serotonin-stimulated transmission of a neural impulse
Which of the following statements regarding freshwater fish is true?
A) Freshwater fish frequently drink to obtain salt ions. B) Freshwater fish use their gills to actively take up salt ions. C) Freshwater fish lose water through their gills by osmosis. D) Freshwater fish do not produce urine.