What types of antigen do T cells NOT recognize?
a. self-antigens
b. cancer antigens
c. bacterial antigens
d. processed fragments of protein antigens displayed on surfaces of body cells
Ans: a. self-antigens
You might also like to view...
Select the potential problems with using current dispersal barriers (for example, a mountain range) to delineate biogeographical regions. Check all that apply.
_____ A barrier for one group of organisms may not be a barrier for another group of organisms. _____ The world's biota correspond more closely to political boundaries. _____ Global climate change may change the distribution of taxa and the size and/or location of some of the dispersal barriers. _____ Human conflicts lead to ever-changing political boundaries. _____ Distantly related organisms with similar appearance and habits may exist on either side of a dispersal barrier.
Each "word" in the mRNA code consists of how many letters?
a. 3 b. 4 c. 5 d. more than 5 e. 0
The light level at which the rate of carbon uptake in photosynthesis equals the rate of carbon loss in respiration is the light ________ point
Fill in the blank(s) with correct word
Many worker bees give their lives to save a bee hive from an attack by bears or other animals. In such cases, we now know that
A. each female worker is waiting to get her chance to reproduce. B. this is a case of bees consciously understanding the need to preserve the nest for their individual benefit-they might survive if all work together. C. These worker bees will have a reproductive benefit if the members of the hive survive. D. this is a case of sexual selection.