Which of the following includes all the others?
a. actin
b. myofibril
c. myosin
d. myofilament
e. muscle fiber
E
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Which of the following statements about the nucleus is NOT true?
A. The nucleus stores the coded instructions for making the cell's proteins B. The nucleus usually contains a nucleolus region which is where ribosome assembly begins C. The nucleus us the site of protein assembly D. The nucleus us surrounded by a nuclear envelope that lets materials in and out
In pea plants, round peas are dominant (R) and shriveled peas are recessive (r), and yellow peas (shown as light gray in the Punnett square) are dominant (Y) and green peas (dark gray) are recessive (y). Using this information and the partial Punnett
square shown, what phenotype should be in the square labeled B? A) round and yellow B) shriveled and yellow C) shriveled and green D) round and green
Which of the following statements is true of selective toxicity?
A) Selective toxicity takes advantage of structural similarities between host and pathogen. B) To be effective, an antimicrobial agent must be more toxic to the patient than the pathogen. C) Selective toxicity takes advantage of differences in metabolic rates of the host and pathogen. D) Selective toxicity damages only pathogenic bacteria and not beneficial bacteria. E) Selective toxicity takes advantage of structural and/or metabolic differences between host and pathogen.
If two different auxotrophic strains are placed in a liquid medium culture tube, prototrophic strains can sometimes be subsequently recovered. Choose the mechanism below that would not allow this genetic change
A) transformation B) reverse mutation C) conjugation D) genetic suppression E) transduction