Four of the following are true about water molds. Which one is the exception?
A. Water mold is responsible for the Irish potato famine.
B. Some species are aquatic parasites.
C. Most act as decomposers.
D. Their filaments are composed of haploid cells.
E. Their cell walls are made of cellulose.
Answer: D
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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.
The experiment in Figure 8.2 demonstrates that the ratio of 18O2 /16O2 increases when:
A. the water in the experiment contains 18O2. B. the carbon dioxide in the experiment contains 18O2. C. the water and carbon dioxide in the experiment both contain 18O2.
If all the meiofaunal organisms were eliminated from a sandy beach, how would that affect the habitat and the trophic structure of the beach?
What will be an ideal response?
Each of the following statements accurately describes a feature of arteries EXCEPT which one?
A) Arteries have an endothelial lining that reduces friction and promotes smooth blood flow. B) Arteries have a smooth muscle layer on the outside, which provides some stiffness. C) Elastin fibers in arterial walls allow stretching of the arteries. D) Valves along major arteries maintain directed blood flow. E) A tough supportive layer of connective tissue containing collagen is found on the outer surface of arteries.