How can lichens serve as an early indicator of air pollution?
What will be an ideal response?
Lichens are very sensitive to sulfur dioxide, and their disappearance is an early sign of industrial pollution. You could consider lichens the equivalent of the canary in the mineshaft.
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The integrase enzyme is responsible for inserting bacteriophage ? into the host genome
Indicate whether the statement is true or false
Why are many human recessive disease alleles maintained in populations despite continuing selection against them?
A) Heterozygotes have a higher fitness than either homozygote. B) Mutations convert recessive alleles to dominant alleles. C) Even when the allele frequency is low, many gametes contain the recessive allele. D) Allele frequency remains constant from generation to generation.
Which organisms are considered most primitive based upon the structure of their limbs?
a. bats b. reptiles c. porpoises d. penguins e. birds
Evidence that organic molecules could be synthesized from the inorganic molecules methane, carbon dioxide, ammonia, hydrogen gas, heat, and energy was provided by which of the following scientists?
a) Cuvier b) Miller and Urey c) Schmidt and Tyler d) Lydig and Wallace e) Oparin and Haldane