Which of the following layers forms the outer
covering of the gastrointestinal tract?
a. serosa
b. mucosa
c. conjunctiva
d. muscle layer
e. submucosa
Answer: a
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What is the underlying molecular cause of Crohn's disease? a. B cells are mutated and do not release antibodies
b. Receptor proteins are mutated and cause an abnormal immune response. c. Helper T cells are inactivated. d. Mucus is not released from epithelial tissues. e. Antigen-presenting cells are absent.
The movement of actin and myosin fibers in a muscle contraction contains all of the following steps EXCEPT
A. the myosin head attaches to the actin filament. B. the globular myosin head detaches from the actin filament. C. myosin rolls up from one end, forming a ball. D. the myosin head returns to its original conformation. E. the myosin filament advances relative to the actin filament.
The increased reliance on genetically engineered crops grew from the need to ____
a. develop new species of crop plants b. provide farmers with more expensive seeds c. find new pesticides d. produce more food at lower cost without harming the environment
e. find more ways to profit from crop plantsVertebrae of the spinal cord are separated from each other by compressible, flat structures called ________ disks
Fill in the blank(s) with correct word