In a DNA double helix, _____________________
(a) the two DNA strands are identical.
(b) purines pair with purines.
(c) thymine pairs with cytosine.
(d) the two DNA strands run antiparallel.
(d)
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A Punnett square is used to determine
(a) probable gamete genotypes. (b) possible parental phenotypes. (c) possible parental genotypes. (d) possible genetic outcomes of a cross.
Which of the following can directly participate in creating the binding specificity of an enzyme active site? Choose all that apply
A. hydrophobic amino acid side chains B. hydrophilic amino acid side chains C. alpha helical regions of the polypeptide D. beta-sheet regions of the polypeptide E. negatively charged amino acid side chains F. positively charged amino acid side chains
The process of transferring genetic information between bacterial cells is accomplished with a transformation factor called DNA
a. True b. False Indicate whether the statement is true or false
A 76-year-old man attends a meeting at his condominium association where many of his neighbors are sick with respiratory symptoms. He later develops a Haemophilus influenzae in-fection, which is classified as a _________ infection
a. nosocomial b. hospital-acquired c. community-acquired d. heath care–related