Which of the following statements about an ecosystem receiving a moderate level of continued disturbance are true? (Check all that apply.)A) A moderate level of continued disturbance predicts that most communities eventually reach an end-state or climax community.B) A moderate level of continued disturbance should lead to increases in species richness.C) A moderate level of continued disturbance tends to lead to the dominance of K-selected species.D) An example of a moderate level of continued disturbance would be a tree fall in a mature rain forest.E) A moderate level of continued disturbance should lead to all successional stages being present in the community at the same time.
What will be an ideal response?
B, D, E
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A mutation arises in an individual that decreases its fitness. This means that this individual's
A. probability of survival will decrease. B. ability to find food will decrease. C. ability to migrate long distances will decrease. D. contribution to the gene pool of the next generation will decrease. E. likelihood of having healthy offspring will increase.
Why is some pollen self-incompatible?
a. so the pollen will more likely disperse via animals or wind b. so the plant will need less energy c. so the plant will need less water d. so there will be a mixing of genes
In streams and rivers, decomposition occurs primarily in
A) riffles. B) pools. C) runs. D) rapids
Imagine that an RNA polymerase is transcribing a segment of DNA that contains the following sequence:
5?-AGTCTAGGCACTGA-3? 3?-TCAGATCCGTGACT-5? A. If the polymerase is transcribing from this segment of DNA from left to right, which strand (top or bottom) is the template? B. What will be the sequence of that RNA (be sure to label the 5? and 3? ends of your RNA molecule)?