Describe the ameba motility strategy.
What will be an ideal response?
Amoeba move through the extention and turnover of pseudopods. The extension of these lobe-shaped pseudopods has been studied closely for its relevance to human white blood cells. The mechanism of pseudopod motility remains poorly understood, but it is known to involve a sol-gel transition between cortical cytoplasm (just beneath the cell surface) and the cytoplasm of the deeper interior. The tip of the pseudopod contains a gel of polymerized actin beneath the cell membrane. From the center of the ameba, liquid cytoplasm (sol) containing actin subunits streams forward along microtubular "tracks," powered by ATP hydrolysis. The actin subunits stream into the pseudopod, where they polymerize, forming a gel. Then, the gel region grows, pushing the membrane forward. As the gel is pushed backward, it resolubilizes to continue the cycle.
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The Earth formed approximately
(a) 4600 years ago. (b) 1 million years ago. (c) 1 billion years ago. (d) 4.6 billion years ago.
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?
What will be an ideal response?
Some aquatic poikilotherms (e.g., sharks) are able to maintain a higher internal body temperature than the surrounding water
Indicate whether the statement is true or false
Select the best response to the question. You are treating a patient with a sore throat. The patient's rapid strep test has come back negative. What should be done next?
A) The patient can be discharged without further evaluation. B) Blood work should be drawn. C) A throat culture should be sent. D) A sputum culture should be collected.