Indicate which of the following statements are true regarding an intron. (Select all that apply)
a. an intron is a portion of mRNA that undergoes translation in the cytoplasm
b. an intron is a portion of mRNA that must be removed before translation
c. an intron is a portion of mRNA that does not code for protein
b. an intron is a portion of mRNA that must be removed before translation
c. an intron is a portion of mRNA that does not code for protein
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What soil component is most important for retaining water in soil for use by plants?
a. sand b. humus
c. clay d. silt e. rock
Gram-positive bacteria have ____ and appear
____ under the microscope. a. thick walls; pink b. thick walls; purple c. thin walls; pink d. thin walls; purple e. none of these
Cells divide because _______.
a) some single-celled species use cell division as a means of reproduction b) an organism needs to increase its number of cells in order to grow c) cells die and need to be replaced d) all of the above are correct
Pyloric stenosis is the most common cause of:
A) Mallory-Weiss syndrome. B) infantile intestinal obstruction. C) gastrointestinal bleeding in adults. D) mesenteric ischemia.