You are taking a lab practical exam. One station has a microscope slide of a cross section through an artery and vein. Which vessel is the artery?
A. the vessel with more muscle tissue and elastic fibers in its wall
B. the vessel with valves to prevent backflow
C. the vessel lined only with endothelium
D. the vessel with a greater overall diameter
E. the vessel with the wider lumen (e.g., interior space that contains the blood)
A. the vessel with more muscle tissue and elastic fibers in its wall
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Localized infections by pyogenic bacteria often form boils or abscesses
Indicate whether the statement is true or false.
Maintaining a constant internal environment for all biological process is known as what?
a. regulation b. homeostasis c. adaptation d. energy usage
The length of a DNA sequence is _____ than the mature mRNA transcribed from it, because
A. shorter it does not contain exons. B. equal it was transcribed from the DNA sequence. C. longer it does not contain introns. D. shorter each codon of three bases encodes only one amino acid. E. longer each codon of one amino acid encodes three bases.
If only about 1% of the human genome is devoted to protein-encoded genes, what is the majority of the rest?
A. structural DNA B. repeated sequences C. duplicated sequences D. transposable elements E. introns