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

Biology & Microbiology

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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

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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

Biology & Microbiology

A weak bond or polar attraction between the hydrogen of one compound and compounds containing oxygen or nitrogen is called a:

Biology & Microbiology

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

Biology & Microbiology