Match each type of muscle with the correct description of its structure.
Answer: cardiac - has intercalated disks; generally uninucleated
skeletal - cells are multinucleated; fibers run the length of the muscle
smooth - cells are spindle-shaped, each with a single nucleus
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The aspect of human evolution in which the genes microcephalin and ASPM have been implicated is the
A. evolution of our large frontal cortex. B. evolution of language. C. evolution of bipedal locomotion (walking upright). D. evolution of an opposable thumb. E. the evolution of mother-infant bonding
A specimen from a patient suffering diarrhea shows a one-celled organism in the microscope. The organism moves very slowly by protruding its cytoplasm. You would predict that the patient has an infection caused by ________.
A. Toxoplasma B. Entamoeba C. Plasmodium D. Trichomonas E. Giardia
Which accessory digestive organ secretes both enzymes and hormones?
a. pancreas b. gallbladder c. liver d. duodenum e. stomach
Most scientists believe that the lateral buds nearest the top of a tree are most inhibited from sprouting because they
A) receive the most auxin from the apical bud. B) produce gibberellins. C) are most exposed to the light. D) are the most affected by gravity. E) are shaded by the apical bud and the top of the tree.