The critical tissue for producing a vasodilatory effect of acetylcholine in Robert Furchgott's experiments with rabbit aortas was the
A. endothelium.
B. smooth muscle layer.
C. elastic outer layer.
D. pericardium.
E. one-way valves.
A. endothelium.
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Mitochondria likely arose from _________ and chloroplasts likely arose from _________
Fill in the blank(s) with correct word
A codon is a three-base sequence of
A) mRNA that codes for an amino acid. B) rRNA that codes for an amino acid. C) tRNA that codes for an amino acid. D) mRNA or tRNA that codes for an amino acid.
Many bacteria that were originally classified in the genus Streptococcus are now placed into two new genera, Enterococcus and Lactococcus.
Answer the following statement true (T) or false (F)
Which of the following has NOT been a basis for classification of the protozoa?
A) means of locomotion B) genetic sequences C) photosynthetic ability D) habitat E) ability to form a dormant stage