_________________ structures are similar in function and appearance as a result of descent.
A. Vestigial
B. Homologous
C. Analogous
D. None of the above
B. Homologous
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Scorpions have a prosoma, pedipalps that are modified into claws, and chelicerae. Which taxonomic group are they a member of?
A. Chelicerata B. Hexapoda C. Crustacea D. Myriapoda
The major histocompatibility complex is
A. a set of genes that code for MHC glycoproteins. B. a set of glycoproteins, called MHC antigens, found on all body cells. C. located in the thymus gland. D. found on the third chromosome. E. All of the choices are correct.
Antibody genes
A) contain both constant and variable regions. B) are formed by cutting and splicing DNA in B cells during development. C) are made from two heavy and two light chains, each of which has a variable region. D) each recognize one antigen and are the only antibody made by their B cell. E) All of these
In eukaryotes, the 3' poly-A tail is attached to
A. poly-A polymerase. B. the template strand of DNA. C. mRNA. D. the ribosome. E. tRNA.