The type of allograft rejection associated with fibrosis and scarring of vessel lumens is:
A. a hyperacute rejection.
B. an acute antibody-mediated rejection.
C. an acute cellular rejection.
D. a chronic rejection.
Ans: D. a chronic rejection.
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A Ramachandran plot shows the sterically limited rotational domains:
A. between proline and noncylic amino acids. B. between polar and nonpolar R groups. C. of an R group with respect to the neighboring R groups. D. of an R group with respect to the polypeptide backbone. E. that two polypeptide chains can occupy.
Several genetic disorders, including Fanconi anemia and ataxia telangiectasia, are caused by mutations in ____
a. the cell wall b. mitochondrial DNA c. ribosome structure d. DNA repair genes e. DNA polymerase genes
Meiosis involves four nuclear divisions.
Answer the following statement true (T) or false (F)
Messenger RNA is essential for carrying out the ________ function of DNA
A. energy production B. cell replication C. cytoplasmic D. protein synthesis