Darkness increases secretion of __________ by the pineal gland in the brain.
Fill in the blank(s) with the appropriate word(s).
melatonin
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The natural habitat of the bacterium Sphingobacterium is:
a. environment. b. animal oral and respiratory flora. c. environment, cold climates. d. human normal flora.
Two of the oldest flowering plant fossils are known to belong to the genus ____, and are thought to have lived during
the early ____ period.
a. Archaefructus; Cretaceous b. Archaefructus; Carboniferous c. Amborella; Cretaceous d. Amborella; Carboniferous e. Eucalyptus; Cretaceous
What type of mutation is seen here? Wild type: 5?-TAC AAA ATA CAG CGG-3? Mutation: 5?-TAC AAG ATA CAG CGG-3?
A) transition B) transversion C) insertion D) deletion E) nonsense
Introduced species are those species that have been brought to an ecosystem as the result of human actions. How do some introduced species affect biodiversity?
A) They decrease biodiversity because they are not adapted to surviving in the new ecosystem. B) They increase biodiversity and have little impact on the ecosystem's food web. C) They decrease biodiversity by preying on endangered organisms. D) They increase biodiversity over time by always making the ecosystem more suitable for native species