Explain why rigor mortis occurs following death. What will be an ideal response?
Concepts to Consider: Lack of oxygen and death result in the cessation of cellular
respiration, causing depletion of ATP production. ATP is necessary for the release of the
cross bridges formed during muscle contraction. Without ATP production, these bridges
cannot be released and muscle relaxation cannot occur, resulting in extreme muscular
rigidity.
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Biomagnification is a significant problem in aquatic communities. Levels of chemicals magnify (increase or accumulate) at each new link in a food chain. Use the following information to estimate the level of chemical X in a large-mouth bass. One alga can accumulate 1 unit of chemical X. Eachcopepod eats 15 algae. A minnow consumes 10 copepods, each large-mouth bass consumes 20 minnows.
A. 15 units B. 20 units C. 30 units D. 150 units E. 300 units F. 3,000 units G. 20,000 units 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 biomagnification? Choose Answer · Given what you now know, what information and/or problem solving approach 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?
Sperm
(a) are male gametes. (b) are female gametes. (c) contain yolk. (d) are produced in the ovaries.
What is the main method of spore dispersal in the basidiomycetes?
a. Wind b. Amphibians c. Water d. Insects e. Mammals
Multicellular organisms with hard exoskeletons, segmented bodies and four pairs of jointed legs in the adult stage are
A. algae. B. arachnids. C. insects. D. helminths. E. lice.