Trophic levels form the basis of food chains and food webs. Thoroughly discuss and give examples of the four trophic
levels plus decomposers. Use a specific ecosystem (such as the desert, forest, etc.) to show the relationships between the
various levels. Make sure you use real plants and animals as examples. What will be an ideal response?
The four trophic levels are: 1) primary producers; 2) primary consumers; 3) secondary
consumers; 4) tertiary consumers and decomposers.
An example might be a prairie ecosystem where a mouse eats grass; a snake eats the mouse;
and an owl eats the snake. The primary producer is the grass; the primary consumer is the
mouse; the secondary consumer is the snake; and the tertiary consumer is the owl. An
example of a decomposer could be bacteria living in the soil.
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Which of the following is a symptom of Cushing's disease?
a. loss of ability to cope with stress b. mild infection c. abnormally large face and hands d. fat deposition around the trunk e. mental retardation
Which of the following types of radioactive particle has the highest LET?
a) Alpha particle b) x-ray c) gamma-ray d) proton
You are studying a protein that you call Protein X. There is an aspartic acid at a key position in Protein X which is important in the folding and stabilization of that protein
If this aspartic acid is changed to a different amino acid, which one of the following amino acid substitutions is most likely to allow the protein to fold normally? A. threonine B. glycine C. arginine D. glutamic acid E. serine
The fungus Botrytis cinerea infects grapes. When grapes infected with this fungus are picked at the appropriate stage, they produce a delicious sweet wine. In order for wine producers to encourage this infection, they could try to enhance the function of which fungal genes?
A. Avirulence genes. B. Resistance genes. C. Genes that encode microRNAs. D. Genes that lead to the production of NO.