The characteristic that makes the muscle cells unique is the relative abundance and organization of
A. collagen fibers.
B. actin and myosin fibers.
C. keratin fibers.
D. gelatinous mass.
E. fibroblast cells.
Answer: B
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Toxins can lead to:
a. increased harvestable metals in the ocean. b. reduction in anaerobes in the sediment. c. reduction in primary production. d. increase in primary production. e. increase in individual size and growth rates.
Which of the following statements is false?
a. Whales use their jaws to hear. b. Whales lack a pair of middle ears. c. Killer whales use echolocation and have ears that are sensitive to high-frequency sounds. d. Humpback whales emit very low-pitched sounds that travel long distances underwater. e. Sound waves are transmitted through a layer of fat before being transduced in whales.
When experimenting with Streptococcus pneumoniae in the 1920s, Griffith concluded that some substance from the dead S strain bacteria passed to the R strain bacteria, imparting virulence and the ability to form a capsule. Avery and others continued the search for the substance that "transformed" the R strain into the S strain.Hypothesis I:Genetic material or "transforming substance" is protein.Hypothesis II:Genetic material or "transforming substance" is RNA.Hypothesis III:Genetic material or "transforming substance" is DNA.An experiment was performed that demonstrated that DNA extracted from the S strain bacteria transformed R strain bacteria. This finding
A. supports Hypothesis I. B. supports Hypothesis II. C. supports Hypothesis III. D. rejects Hypothesis I only. E. rejects Hypothesis II only. F. rejects Hypothesis III only. G. does not support any of these hypotheses.
Identify the biotic factor of an ecosystem among the following options
A) Amount of nitrogen available for the moss to grow on cliffs B) Nesting spots on the edge of a cliff that birds can use C) Average wind forces that the cliffs withstand daily D) Amount of moss available to the consumers