What is the function of troponin in muscle contraction?
A. Troponin slides past myosin causing
muscle shortening.
B. Troponin forms the cross-bridges between
actin and myosin.
C. Troponin moves tropomyosin from actin so
that the actin can bind to myosin.
D. Troponin has no function in muscle
contraction.
C
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If you were given a new necklace and developed reddening, swelling, and itching of your skin around your neck 24 hours after putting on the necklace, what reason would you give to this phenomenon? What immune cells are involved?
What will be an ideal response?
Aerobic exercise affects muscle cells by
1.increasing the number of mitochondria. 2.increasing the size of mitochondria. 3.increasing the number of capillaries supplying muscle tissue. 4.increasing nourishment to the cells and waste removal from the cells. 5.all of the choices
The separation of the Archaebacteria into a separate domain indicates
A) that these organisms are very different from eubacteria and from eukarys B) that organisms should never be classified according to how they appear (morphological characteristics) C) that early taxonomists rushed to classify them without closely examining them D) that optical viewing techniques have greatly improved so that we can better view these microorganisms E) none of the above
Endocytosis and exocytosis are means of transport used by
A. bacteria. B. eukaryotes. C. archaea. D. all prokaryotes. E. nothing; no cells use both processes.