A unit in messenger RNA consisting of a set of three consecutive nucleotides is termed a(n)
A) amino acid.
B) tRNA.
C) anticodon.
D) codon.
E) gene.
Answer: D
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Label G represents the
A) tricuspid valve.
B) pulmonary (semilunar) valve.
C) aortic (semilunar) valve.
D) bicuspid valve.
E) left atrioventricular valve.
To stimulate skeletal muscle contraction, acetylcholine must cross the _____ of the neuromuscular junction and bind to receptors on the motor endplate
a) node of Ranvier b) synaptic cleft c) sarcolemma d) synaptic end bulb e) transverse tubule
Minerals divide into two categories classified as __________________________________________________ and __________________________________________________
Fill in the blank(s) with correct word
Which structure in the fetus enables blood to bypass the lungs and pass directly from the right atrium to the left atrium?
A. Truncus arteriosus B. Foramen ovale C. Sinus venosus D. Bulbus cordis E. Ductus arteriosus