How does glucose enter a cell if levels of blood glucose are high?
A) The glucose molecules diffuse through the membrane.
B) An electrical signal is passed through the blood, opening glucose channels within the membranes of cells.
C) Glucose pokes a hole in the cell's membrane, creating a channel through which it can move.
D) Insulin molecules bind to glucose receptors, causing cellular responses to take up glucose.
Answer: D
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Recent advances in molecular techniques allowed paleobiologists to sequence DNA that was preserved in a woolly
mammoth that died ____ years ago.
a. 27,000 b. 4,000 c. 2,700 d. 1,000 e. 500
Four-year old Sammy is having a temper-tantrum. In a final attempt to get his way, he yells to his mom, “I'm gonna hold my breath ‘til I die!” What is the primary reason that Sammy’s mom is unconcerned by this statement?
A. It is impossible for Sammy to control the contraction of his diaphragm and intercostal muscles since they are made up of smooth muscle. B. As Sammy holds his breath, the decreasing levels of oxygen in his blood will lead to stimulation of the respiratory control center in his brain. C. Sammy is too young to hold his breath for more than 30 seconds. D. As Sammy holds his breath, the increasing levels of carbon dioxide in his blood will lead to stimulation of the respiratory control center in his brain. 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 respiration? 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?
The rate of production of new biomass by heterotrophs is called
A. primary productivity. B. secondary productivity. C. gross productivity. D. net productivity. E. consumer productivity.
Stretch marks are the result of tears in the integumentary layer that contains fibrous connective tissue, elastin, and collagen. What is this region of the integumentary system called?
A. Langerhans layer B. dermis C. epidermis D. hypodermis E. subcutaneous layer