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

Biology & Microbiology

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What is the underlying molecular cause of Crohn's disease? a. B cells are mutated and do not release antibodies

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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.

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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 plants

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Vertebrae of the spinal cord are separated from each other by compressible, flat structures called ________ disks

Fill in the blank(s) with correct word

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