Consider the transplantation of tissue from a donor to a recipient who has a different HLA type but the same ABO blood type. Why will the recipient be likely to reject a kidney from the donor, but will not reject the blood from the donor?
A. There are no Class II MHC molecules on the red blood cells in the donor blood.
B. There are no Class I MHC molecules on the kidney tissue from the donor.
C. There are no Class I MHC molecules on the red blood cells in the donor blood.
D. There are no ABO antigens on the kidney tissue.
Answer: C
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Which of the following lymphoid organs or tissues has the immunological function of filtering pathogens from the blood?
A. Lymph nodes B. Thymus C. Spleen D. GALT E. Tonsils
The birth process in mammals is an example of positive feedback
Indicate whether the statement is true or false.
A negative feedback system has four steps. Please choose the answer that lists the steps in the correct order
a. sensory receptors, stimulus, brain, effectors b. stimulus, sensory receptors, brain, effectors c. effectors, brain, sensory receptors, stimulus d. brain, effectors, sensory receptors, stimulus e. stimulus, effectors, sensory effectors, brain
The two-factor crosses performed by Mendel support the observation that
A. alleles for a given trait are distributed randomly among an individual's gametes independent of the alleles for other traits. B. the F1 generation can display phenotypes in combinations different from those seen in the P generation. C. traits that are encoded by genes on different chromosomes are never found within the same gamete. D. self-fertilization of the F1 generation will produce 100% heterozygous plants at both loci. E. the F2 generation will only display phenotypes in the same combinations as the P generation.