The (fungi/algae/lichens) are so sensitive to pollutants that they are used as indicators of environmental conditions.
Fill in the blank(s) with the appropriate word(s).
lichens
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What is an invasive species?
a. a nonnative species that often outcompetes native species, leading to their extinction b. a native species that evolves a new trait and occupies more ecological niches c. a nonnative species that enriches the species diversity of a new ecosystem d. a nonnative species that often outcompetes native species, leading to evolution e. a nonnative species that eventually becomes extinct
What causes the large majority of errors in DNA replication?
1.chemical carcinogens 2.the speed of the replication process 3.the complexity of the replication machinery 4.mutations in proofreading and repair genes
Some recessive mutations can be exceedingly debilitating or lethal when expressed in homozygotes. If their effects are so severe, why doesn't natural selection simply purge such alleles from the population completely?
What will be an ideal response?
Apoptosis differs from necrosis in that necrosis ________________
(a) requires the reception of an extracellular signal. (b) causes DNA to fragment. (c) causes cells to swell and burst, whereas apoptotic cells shrink and condense. (d) involves a caspase cascade.