"Artery" and "vein" are defined by whether they leave or enter the heart. If they were defined by whether they carried oxygenated or deoxygenated blood, we would have to change the name(s) of
Select one:
a. the hepatic portal vein to a hepatic portal artery.
b. the hepatic and renal systems (they would have to be switched).
c. the pulmonary artery and vein (they would have to be switched).
d. the coronary artery and vein (they would have to be switched).
e. the aorta and vena cava.
c. the pulmonary artery and vein (they would have to be switched).
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A reaction where an electron is lost is called ________.
A. reduction B. oxidation C. ionization D. decomposition E. dissolution
A filter feeder is an animal that:a
has well-developed teeth for stabbing prey. b. secretes paralyzing venom suspended in saliva. c. has a symbiotic relationship with its host. d. entraps food particles from water. e. feeds on nectar while suspended in air.
What is the age of the twig in the accompanying figure?
a. 0 years
b. 1 year
c. 2 years
d. 3 years
e. 5 years
Some tRNAs have the ability to pair with different codons due to imprecise base pairing with the third base in the codon. How is this ability described?
a. by degeneracy b. by exon shuffling c. by the wobble hypothesis d. by alternative splicing