Parasitism is an intimate species interaction in which ______________
A. both species benefit
B. both species are harmed
C. one species benefits, and the other is harmed
D. both species are unaffected
E. one species benefits, and the other is neither harmed nor benefited
Answer: C. one species benefits, and the other is harmed
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Which of the following is useful in distinguishing between prokaryotic and eukaryotic cells?
A. The presence of membrane-delimited organelles within the cytoplasm B. The use of DNA for the storage of genetic information C. The presence of ribosomes for the synthesis of proteins D. All of the choices are correct.
In sponges, spicules are ____
a. fibrous skeletal proteins b. specialized digestive cells c. complicated pore openings and passageways d. needle like skeletal structures made up of silica or calcium carbonate e. feeding cells with a flagellum surrounded by a collar
Which of these statements is true?
a. Plasma membranes can rupture if the cell absorbs too much water or is compressed. b. Proteins and carbohydrates embedded in the plasma membrane cannot shift positions. c. Plasma membranes containing saturated fatty acids are more resistant to freezing. d. Carbohydrates represent the largest portion of the plasma membrane by volume.
__________ diseases are those abnormal conditions in which the body's defensive cells fail to make the self versus the nonself distinction correctly, and attack the body's own tissues.
A. Septic B. Nondiscrete C. Autoimmune D. Cancerous