Which of the following does not occur during RNA processing?
A. the addition of a nucleotide cap to the 5'
end of the newly transcribed RNA
B. the addition of a poly(A) tail to the 3' end of
the newly transcribed RNA
C. the removal of all exons during RNA
splicing
D. the removal of all introns during RNA
splicing
E. the degradation of excised RNA
C
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Plants and algae most recently shared a common ancestor 480 million years ago, and plants colonized land shortly after that. In sexual reproduction, an alga simply releases gametes into the water, and the current carries the sex cells to another individual. What adaptation arose in gymnosperms and angiosperms that allowed reproduction on dry land and over great distances?
A. development of stomata B. production of lignin C. development of vascular tissue D. production of pollen E. production of a cuticle
What type of tissue consisting of a single layer of cells containing cilia lines the throat and nasal passages?
a. simple epithelium b. simple squamous epithelium c. stratified columnar epithelium d. pseudostratified epithelium e. compound epithelium
The neural control centers for the heart ____
a. are primarily stimulatory b. are found in the spinal cord and brain c. influence only heart rate
d. stimulate heart rate and decrease contraction strength e. play a minor role in cardiovascular feedback
Paneth cells, which are capable of phagocytizing bacteria, are found in the
a) small intestine. b) large intestine. c) stomach. d) pancreas.