Which of the following statements about tissue transplants is true?
a. The source of graft rejection is T cell recognition of the MHC antigens on the transplanted
cells.
b. If transplants demonstrate a perfect match for all Rh antigens, then there is a 95% success
rate.
c. Successful transplants require a complete match of all MHC antigens.
d. Xenotransplantation avoids the fundamental transplant mechanism of graft rejection.
e. Skin can be successfully transplanted between siblings and other closely related family
members
A
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Nearly all cells use ATP as their primary energy source. This is evidence that ___________________
A. life continues to evolve and use novel energy sources B. ATP evolved recently (in the last 100 years) as a potential source of energy C. the use of ATP by cells began eons ago and has been conserved D. only eukaryotic cells can produce ATP E. fossil fuels are composed of ATP
Which part of the inflammatory response walls off the injured site, preventing the spread of the damage?
a. vasodilation b. leakage of clotting factors out of the blood c. edema d. fever e. increased blood flow
If we think of the DNA double helix as a twisted ladder, what makes up the rungs or steps of the ladder?
A. purines and pyrimidines B. alternating phosphate groups and sugars C. phosphate groups and bases D. sugars only E. phosphate groups only
The zygote produces haploid cells by ________
Fill in the blank(s) with the appropriate word(s).