Which type of gene expression occurs when a person has type AB blood?
A. Homozygous dominant
B. Incomplete dominance
C. Codominance
D. Homozygous recessive
Answer: C
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Which segment of the ECG reflects the plateau phase of ventricular muscle cells' action potentials?
A. P-T segment B. S-T segment C. Q-R segment D. P-R interval E. T-P interval
The first extraembryonic membrane to appear is the
A) chorion. B) allantois. C) placenta. D) yolk sac. E) amnion.
The valve located between the right ventricle and the pulmonary trunk is the
A. aortic semilunar valve. B. tricuspid valve. C. bicuspid valve. D. mitral valve. E. pulmonary semilunar valve.
Apoptosis involves the activation of enzymes called ________, which are the cell "executioners" that activate other enzymes in the nucleus that fragment the DNA.
A. neutrophils B. peroxisomes C. lysosomes D. caspases