A bone marrow transplant may not be appropriate from a given donor (Jane) to a given recipient (Jane's cousin Bob), even though Jane has previously given blood for one of Bob's needed transfusions, because _____
A) even though Jane's blood type is a match to Bob's, her major histocompatability (MHC) proteins may not be a match
B) a blood type match is less stringent than a match required for transplant because blood is more tolerant of change
C) for each gene, there is only one blood allele but many tissue alleles
D) Jane's MHC class II genes are not expressed in bone marrow
A
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Select the proper order of the propagation of an electrical (depolarization) signal in the heart
a. AV node ?Purkinje fibers ?SA node b. AV node ?SA node ?Purkinje fibers c. Purkinje fibers ?AV node ?SA node d. Purkinje fibers ?SA node ?AV node
e. SA node ?AV node ?Purkinje fibersBlood is pumped from the heart into the arterial system, which branches from arteries into fine _________.
A. arterioles B. veins C. capillaries D. venules
The photoreceptor protein rhodopsin
A) is found in cone cells and is sensitive to weak light at many wavelengths. B) is found in rod cells and is sensitive to weak light at many wavelengths. C) is found in cone cells and is responsible for blue color vision. D) is found in rod cells and is responsible for red color vision. E) is missing in individuals who exhibit red-green color blindness.
By definition, if the DNA of a cell undergoes a spontaneous mutation, is was NOT due to ________.
A. spontaneous depurination of nucleotides B. insertion of transposons C. exposure to radiation D. errors in DNA replication