Muscle contraction occurs in a cyclic process. Which of the following sequences is in the correct order?
A) power stroke, cross bridge formation, cross bridge dissociation, cocking of myosin
B) cross bridge formation, power stroke, cross bridge dissociation, cocking of myosin
C) cross bridge formation, cocking of myosin, power stroke, cross bridge dissociation
D) cross bridge formation, cross bridge dissociation, cocking of myosin, power stroke
E) cross bridge formation, power stroke, cross bridge dissociation, power stroke, cocking of myosin
B) cross bridge formation, power stroke, cross bridge dissociation, cocking of myosin
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Sponges can have skeletons made of all these materials except:
a. silica. b. calcium carbonate. c. starch. d. spongin. e. protein.
Which of the following is a function of the Golgi apparatus?
a. Distributing lipids and proteins b. Maintaining a cell’s shape c. Moving and filtering particles d. Breaking down fatty acids
The initial skeleton of all vertebrate embryos is made
of a. cartilage. b. collagen. c. compact bone. d. spongy bone. e. fibrous proteins.
Which of the following statements is TRUE?
a) once a person reaches maturity, cell division stops unless it is to repair a wound
b) cell division in an adult signifies cancer
c) some specific cells throughout the body retain the ability to divide & replace themselves
d) growth continues on throughout life of an adult human