Eumetazoans are animals having only one tissue layers

____________________ Indicate whether the statement is true or false.


F, two or three

Biology & Microbiology

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A twitch is contraction and relaxation of

A. one neuron. B. one muscle cell. C. an entire muscle. D. one sarcomere. E. several muscles.

Biology & Microbiology

If all of the hairlike structures, called ________, in respiratory passages suddenly stopped working, a person would probably have more respiratory infections

Fill in the blank(s) with correct word

Biology & Microbiology

You are studying populations of a certain species of frog in two ponds five kilometers apart. There are no other ponds in the area. In pond A all the frogs are small and have a few black spots on them. In pond B most of the frogs are large and lack spots but a few are small without spots and a few are large with spots. Which of the following is the most likely cause of the genetic diversity seen in pond B? 

A. The small frogs and spotted frogs in pond B are mutations. B. Pond A frogs resulted from individuals migrating from pond B. C. The small frogs and spotted frogs in pond B probably are the result of some frogs migrating from pond A to pond B. D. Meiosis generated more genetic diversity in pond B than in pond A.

Biology & Microbiology

Antigens can be all of the following except

A) proteins. B) large polysaccharides that protrude from virus surfaces or foreign cells. C) blood or tissue cells from organisms of the same or different species. D) lipids such as cholesterol.

Biology & Microbiology