Each genetically distinct group of lymphocytes that possesses the same specificity is called a _____.
Fill in the blank(s) with the appropriate word(s).
Clone
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What are antigens?
A. non-self proteins or cells B. proteins on the surface of B-cell membranes C. proteins that consist of two light and two heavy chain polypeptide chains D. proteins on the surface of macrophage membranes E. proteins on the surface of T-cell membranes
Which are evolutionary modifications that improve the survival and reproductive success of an organism?
a. mutations b. adaptations c. artificial traits d. homoplastic traits e. vestigial structures
A weak bond or polar attraction between the hydrogen of one compound and compounds containing oxygen or nitrogen is called a:
Which of the following is the most likely candidate for the first eukaryotic life-forms to move onto land?
A) algae in shallow water B) trilobites C) amphibians in shallow water D) fungi