During muscle contraction, the heads of myosin filaments pull actin filaments toward the center of a ________ (the contractile unit of muscle)
Fill in the blank(s) with correct word
sarcomere
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Which signaling system typically involves the longest time interval between release of a signaling molecule and activation of a receptor?
A. autocrine B. juxtacrine C. paracrine D. endocrine
A 36-year-old man who has traveled for several weeks in the orient is experiencing abdominal pain and diarrhea with a large amount of mucus. A H. heterophyes egg measuring 28 by 15 µm is identified in the stool. The treatment of choice for this intestinal trematode is:
a. metronidazole. b. chloroquine. c. albendazole. d. praziquantel.
The molecule shown above is the purine ____
a. thymine b. adenine c. uracil d. guanine e. cytosine
Which of the following would be most appropriate for disposal of cultures on agar plates?
normal trash receptacle sharps container biohazard bag or bin