Does increasing the predation rate increase or decrease the variation in the size of the prey population?
a. increase
b. decrease
c. no difference
b
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A closed-circular DNA in its relaxed form has a linking number (Lk) of 500 . What will happen to the linking number of this molecule if one of the strands is broken?
A. Lk will increase. B. Lk will decrease. C. Lk will stay the same. D. Lk becomes undefined. E. None of these choices is correct.
On the island of Madeira, two populations of house mice have accumulated different Robertsonian translocation. Which are true about these two populations of mice? (Select all that apply.)
A) They have fewer chromosomes than mice in other areas of the world. B) They are isolated from each other geographically. C) If mice from different populations mate, their offspring are sterile. D) Mice from different populations are unable to mate with each other. E) They are becoming extinct because of semi sterility.
A community differs from an ecosystem in that the former does NOT include
a. unicellular organisms. b. decomposers. c. abiotic (nonliving) factors. d. unicellular organisms and decomposers. e. unicellular organisms, decomposers, and abiotic (nonliving) factors.
Which of the following types of organisms are not composed of eukaryotic cells?
A) fungi B) plants C) animals D) protists E) bacteria