Which molecule blocks the myosin head from binding to actin in a relaxed muscle?
A. Troponin
B. Titin
C. Tropomyosin
D. Calcium
Answer: C
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________ fibers are stronger than steel when stretched
A) Calcium B) Mineral C) Elastic D) Carbon E) Collagen
What is the correct order of structures through which air flows into the respiratory tract?
A. Larynx; pharynx; trachea; bronchioles; bronchi B. Pharynx; larynx; trachea; bronchi; bronchioles C. Larynx; pharynx; trachea; bronchi; bronchioles D. Larynx; pharynx; bronchi; trachea; bronchioles E. Pharynx; trachea; larynx; bronchi; bronchioles
In which type of reaction are water molecules split off as peptide bonds are formed?
Hydrolysis Dehydration synthesis Glycolysis Lipolysis
Salt was added to a beaker of distilled water (the water was not stirred). A sample taken from the bottom of the beaker was found to be 20% salt. At the same time, a sample taken from the top of the beaker was found to be 2% salt. After 24 hours
A. the samples would still be 2% and 20% respectively. B. the difference in the percentage of salt between the top and bottom samples would increase. C. the salt would float to the top. D. the percentage of salt in the top and bottom samples would be approximately equal. E. None of the choices are correct.