Muscle tissue is characterized by its _____.
Fill in the blank(s) with the appropriate word(s).
contractility
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Answer the question using the accompanying figure. In the figure, letter B represents a ____ taxon, which includes
____.
a. monophyletic; an ancestral species and all of its descendants b. polyphyletic; species from different evolutionary lineages c. polyphyletic; an ancestral species and all of its descendants d. paraphyletic; species from different evolutionary lineages e. paraphyletic; an ancestral species and only some of its descendants
Which statement is true?
a. Once a vaccine for a virus has been developed, further vaccine development is unnecessary. b. Antiviral drug therapy is safer than vaccination because there is no risk of tissue damage involved. c. Viruses nearly eliminated by mass immunization campaigns can still cause epidemics. d. Vaccinations contain dangerous quantities of chemicals such as mercury and formaldehyde.
Which structure delivers a signal from the motor neuron to all the sarcomeres of a muscle cell?
A) myosin filament B) filaments-line C) T tubule D) sarcoplasmic reticulum
In humans red-green color blindness is a sex-linked recessive trait. If a man and a women produce a color-blind son, which of the following must be true?
A. The father is color-blind B. Both parents carry the allele for color blindness C. Neither parent carries the allele for color blindness D. The father carries the allele for color blindness E. The mother carries the allele for color blindness