What type of bond contributes to a protein's secondary structure?
a. peptide bonds
b. covalent bonds
c. ionic bonds
d. hydrogen bonds
e. protein bonds
d
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Concordance refers to
A) percentage of monozygotic twin pairs in which neither express the trait. B) percentage of monozygotic twin pairs in which both express the trait. C) percentage of dizygotic twin pairs in which both express the trait. D) percentage of twin pairs in which both express a trait among pairs in which at least one twin has the trait.
Cytotoxic T cells produce ____
a. cytokines b. antibodies c. plasma cells d. perforins e. histamine
Of the four types of T cells, only the ____________________ T cells destroy infected body cells. Fill in the blank(s) with the appropriate word(s)
Two genes are closely linked when _____.
A) the combination of features increases the fitness above that of either trait separately B) the distance between their loci is small C) they are located on homologous chromosomes D) their recombination frequencies are high E) all of the choices are correct