Major regional groups of interacting terrestrial ecosystems, characterized by climate and geography, are called
A. taigas.
B. estuaries.
C. tundras.
D. biospheres.
E. biomes.
Answer: E
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AMP-activated protein kinase (AMPK) is an enzyme that is activated by high levels of AMP in cells. If levels of AMP are high in cells, that means that levels of ATP are low. Once active, AMPK activates catabolic pathways and inhibits anabolic pathways in the cell. Why do you think that is the case? Choose the answer that best explains the role of AMPK.
A. High levels of AMP indicate that there is a high amount of energy stored in the cell, thus activating catabolic pathways and inhibiting anabolic pathways are mechanisms to use stored energy. B. By inhibiting anabolic pathways, AMPK provides a mechanism to generate heat for the cell, which is important if AMP levels are high in the cell. C. By activating catabolic pathways, AMPK provides a mechanism to activate exergonic pathways, which is important if AMP levels are high in the cell. D. Activating catabolic pathways and inhibiting anabolic pathways will ultimately lead to higher consumption of ATP, which is important if AMP levels are high in the cell. 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 AMP, ADP, and ATP in cells? What other information is related to the question? Choose Answer Do you have all the information needed to make a determination about the change in free energy? 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?
Which molecule can enter the Krebs cycle reactions?
a. glucose
b. pyruvate c. carbon dioxide d. NADH e. acetyl-CoA
What initiates the sodium-potassium pump?
A. Two potassium ions are transported into the cell. B. ATP binds to the protein which becomes phosphorylated (ADP is released). C. Three sodium ions are translocated out of the cell. D. Three sodium ions bind to the cytoplasmic side of the protein. E. Phosphorylated pump has low affinity for sodium allowing sodium to leave and potassium to bind.
Thylakoids are stacked on top of one another into little piles called ________.
Fill in the blank(s) with the appropriate word(s).