#Question id: 2055
#Unit 4. Cell Communication and Cell Signaling
The proteins of the membrane attack complex (MAC) insert into the cell membranes of invading microorganisms and punch holes that result in lysis of the pathogen. The complement components of the MAC are,
#Question id: 19381
#Unit 12. Applied Biology
#Question id: 23627
#Unit 13. Methods in Biology
#Question id: 1730
#Unit 4. Cell Communication and Cell Signaling
What is the T-cell ligand binding B7 on a professional antigen-presenting cell?
#Question id: 4999
#Unit 11. Evolution and Behavior
In the 5—7 million years that the hominid lineage has been diverging from its common ancestor with the great apes, dozens of hominid species have arisen, often with several species coexisting in time and space. As recently as 30,000 years ago, Homo sapiens coexisted with Homo neanderthalensis. Both species had large brains and advanced intellects. The fact that these traits were common to both species is most easily explained by which of the following?