Why don't corneal transplants (in the eye) provoke an immune response?
a. corneas are not cellular structures
b. corneal cells secrete a chemical to trigger apoptosis in attacking lymphocytes
c. lymphocytes recognize all corneas as "self"
d. there are no lymphocytes in the eye
e. corneal cells resemble lymphocytes
B
You might also like to view...
In humans, birth weight is an example of a characteristic affected by stabilizing selection. What does this mean to the long-term average birth weight of human babies? How might the increasing number of Caesarean sections be affecting this characteristic?
What will be an ideal response?
All of the following are common functional groups found in biological molecules except
A) phosphate groups. B) carbonyl groups. C) amino groups. D) sulfhydryl groups. E) butyl groups.
How does exercise effect the heart rate?
Which of the following worms lacks a digestive system?
a. filariae b. tapeworms c. earthworms d. roundworms e. leeches