Primordial germ cells can be found in the ________ of the developing female embryo
A) yolk sac B) allantois C) placenta D) chorion
Answer: A
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An endotoxin is
A) the toxic portion of the LPS. B) a toxin produced within archaeal cells. C) a toxin known for its primary attack on the epidermis of mammals. D) a toxin produced in the periplasm of most bacteria.
If sympathetic and parasympathetic neurons both release acetylcholine (ACh), how can they have antagonistic effects? (Check all that apply.)
_____ The target cells of each set of neurons respond differently to the same signal. _____ Each type of neuron secretes ACh bound to a different co-neurotransmitter. _____ Sympathetic neurons activate the adrenal gland, causing secretion of epinephrine. _____ The neurons release different forms of ACh. _____ Parasympathetic neurons activate the adrenal gland, causing secretion of epinephrine. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content/Choose Answer · What do you already know about the sympathetic and parasympathetic systems? What other information is related to the question? 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?
Why are conditional knockout animals desirable?
A) Genes that are essential for development can be deleted in the adult or only in specific tissues. B) Animal cell lines with deletions can be created. C) They are easier to create than standard knockout animals. D) The mutations they create are more stable than those created by standard knockout techniques.
Which soil type is the most prone to leaching?
a. gravel or sand b. silt c. clay d. humus e. none of these