Which mineral is essential to the production of thyroid hormone?
a. iron
b. calcium
c. sodium
d. potassium
e. iodine
E
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Collective estimates of the physiological reactions occurring in the entire microbial community are known as ________ measurements
A) in vitro B) in situ C) activity D) metagenomics
If any of the proteins involved in mismatch repair are damaged, the mutation rate and cancer risk will rise; this is called the ___________.
a) alteration phenotype b) stability phenotype c) mutator phenotype d) alteration genotype e) mutator genotype
What is the enzyme used in DNA replication that unwinds the supercoiled, packaged DNA
What will be an ideal response?
T cells binding to MHC-peptide complexes are responsible for acceptance or rejection of transplanted organs. To facilitate acceptance of the transplant, the ideal donor will have a close genetic relationship with the recipient-even then, immune suppression drugs are often necessary. In a strange variation of this phenomenon, the endangered Tasmanian devil of Australia suffers from a devastating disease in which tumorous tissue is transmitted from animal to animal. What is the likely explanation for the lack of rejection of this transmissible tumor?
A. Low genetic diversity makes the MHC genes invariant, so the "transplanted" tissue is accepted as self. B. Marsupials lack an adaptive immune system. C. MHC genes are unique to humans. Without them, the T cells have no way to distinguish self and non-self. D. Tumors are never targeted by T cells, unless they are caused by a viral infection.