The accompanying figure represents the research of which scientist(s)?
a. Delbrück
b. Avery and McCarty
c. Chagraff
d. Luria
e. Hershey and Chase
ANSWER: e
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Intrinsic properties of immunogens include
A) appropriate physical form. B) molecular size. C) sufficient molecular complexity. D) appropriate physical form, molecular size, and molecular complexity.
Fleas
A. may transmit Yersinia pestis. B. may transmit Lyme disease. C. may transmit a toxin. D. have only one host, humans.
Which of the following happens during contraction of a skeletal muscle?
1.The myosin strands get shorter.
2.The concentration of Ca2+ in the cytosol of the muscle fiber decreases.
3.Troponin attaches to myosin.
4.The z lines get closer to each other, shortening the sarcomere.
What do smooth, cardiac, and skeletal muscle all have in common?
A. They all interlock at intercalated disks. B. The cells of these muscles are all called muscle fibers. C. They are all striated. D. They are all uninucleated. E. They are all found in the walls of blood vessels.