What feature of cardiac muscle helps the cells coordinate their contraction as a single unit? 

A. fused cells with multiple nuclei
B. covalent bonds between actin and myosin molecules
C. intercalated disks rich in gap junctions
D. large numbers of motor neurons


C. intercalated disks rich in gap junctions

Biology & Microbiology

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The vast majority of microorganisms found in soils have been successfully cultured in the laboratory.

Answer the following statement true (T) or false (F)

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How does evolutionary change occur?

A. Through the modification of characteristics in a preexisting population. B. It may involve vertical descent with mutation. C. It may involve horizontal gene transfer. D. All of these choices are correct. E. None of these choices are correct.

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Compared to the average cow’s milk production, how many times greater was Blackrose II’s milk

production? A. 2 times D. 5 times B. 3 times E. 10 times C. 4 times

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Which of the following statements is true?

A) All organisms can use sunlight to produce chemical energy. B) Plants use solar energy to turn glucose into oxygen. C) Cellular respiration occurs only in plants. D) Chemical energy, in the form of glucose, is the primary source of energy for life.

Biology & Microbiology