Scientists estimate that as much as one-fourth of all species will become extinct in the near future, a rate of extinction not seen on Earth since the Cretaceous mass extinction. How are humans contributing to this mass extinction? (Check all that apply.)A) Contributing to climate changeB) Intentionally killing all members of a speciesC) Destroying habitatD) Blocking evolution
What will be an ideal response?
A, C
Altering ecosystems has the biggest effect on where a species can live.
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In the 1940's, biologist Adolph Murie studied survival in Dall sheep in what is now Mount Danali National Park in Alaska
He found that Dall sheep that survive their first year of life have a high probability of surviving until they are around 9 years old; after that, they rapidly become easy prey for wolves and die at a very high rate. This pattern best fits a type ____ survivorship curve. Fill in the blank with the appropriate word.
Why was it important that the pea plants Mendel chose were true-breeding?
a. These plants were resistant to mutations that would have confounded his calculations. b. True-breeding plants meant that infertile samples did not affect trait inheritance probabilities. c. Because the plants were naturally self-fertilizing, traits from other plants could be excluded. d. Scientific journals at that time would only accept results from specific, verified species
If tall (D) is dominant to dwarf (d), and two
homozygous varieties DD and dd are crossed, then what kind of progeny will be produced? a. all intermediate forms b. all tall c. all dwarf d. 1/2 tall, 1/2 dwarf e. 3/4 tall, 1/4 dwarf
Which of the following statements regarding competitive inhibitors is true?
a. The inhibitor will degrade the substrate. b. Competitive inhibitors decrease the rate of enzyme activity. c. The inhibitor will destroy the substrate. d. The inhibitor will destroy the enzyme.