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

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

The molecule shown above is the purine ____

a. thymine b. adenine c. uracil d. guanine e. cytosine

Biology & Microbiology

Which of the following would be most appropriate for disposal of cultures on agar plates?

normal trash receptacle sharps container biohazard bag or bin

Biology & Microbiology