A selectively ________ membrane is one that allows some molecules to pass through but not others
Fill in the blank with correct word.
Answer: permeable
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One nautical mile equals one degree of latitude
Indicate whether the statement is true or false
What accounts for the fact that polydactylism is prevalent and Tay-Sachs disease is virtually absent in one human population in the United States, while Tay-Sachs disease is prevalent and polydactylism is virtually absent in another?
a. Natural selection has promoted these differences since humans live in many different environments. b. Mutation rates differ among different loci. c. There is little gene flow between the two populations. d. The populations are small, and therefore genetic drift is a major factor in the determination of allele frequencies. e. The alleles are fixed in these populations.
The pyramid of energy illustrates
a. the first law of thermodynamics. b. the diminishing of usable energy as it is transferred through an ecosystem. c. that energy can be recycled. d. the biological magnification of materials in an ecosystem. e. the diminishing number of organisms at each trophic level.
For how long were prokaryotes the only kind of life on Earth?
A) 100 million years B) 500 million years C) 1 billion years D) 1.5 billion years