Which of the following is a relationship between organisms that cannot evolve into a mutualistic relation-ship?
a. parasite–host interaction
b. predator–prey interaction
c. neutral interaction
d. none; any interaction can serve as a precursor
D
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Which of the following type of reversible enzyme inhibitor always lowers the measured Km of the enzyme it binds?
A. competitive B. uncompetitive C. mixed D. uncompetitive and mixed E. competitive, uncompetitive, and mixed
Mycorrhizae
A. are vital for the survival of lichens. B. are vital for the survival of many plants. C. increase the absorptive ability of roots. D. are used in the production of wine, beer, and bread. E. are vital for the survival of many plants AND increase the absorptive ability of roots.
Asexual reproduction ____
a. is common in vertebrates b. involves the fusion of two sperm c. involves the fusion of two eggs d. gives rise to offspring without the fusion of gametes e. involves the fusion of a male gamete and a female gamete
You briefly expose bacteria undergoing DNA replication to radioactively labeled nucleotides. When you centrifuge the DNA isolated from the bacteria, the DNA separates into two classes
One class of labeled DNA includes very large molecules (thousands or even millions of nucleotides long), and the other includes short stretches of DNA (several hundred to a few thousand nucleotides in length). These two classes of DNA probably represent _____. A) leading strands and Okazaki fragments B) lagging strands and Okazaki fragments C) Okazaki fragments and RNA primers D) leading strands and RNA primers