Molecular charge is an important characteristic influencing protein migration on a gel. What accounts for the variation in the molecular charge of proteins?
A) the intronic sequences of the protein
B) the amino acid composition of the protein
C) the negative charge of the sugar-phosphate backbone
D) the amount of protein loaded into the wells of the gel
E) the presence of secondary structures in the protein
B
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If a researcher collects basic information on biological structures or the details of biological processes,
then the researcher's approach is considered to be:
a. science. b. scientific. c. descriptive science. d. not scientific. e. science and scientific only
Combined DNA Index System (CODIS) is
A) a fifteen-base DNA sequence used in DNA profiling. B) a type of mutation used in forensic applications. C) a system for crime laboratories to share DNA profiles. D) a technology used to amplify DNA found at crime scenes.
Which one of the following is a very important source of energy for nearly all cells?
A) cellulose B) deoxyribose C) starch D) glucose E) ribose
Which method of evaluating disinfectants is the currently used standard?
A. use-dilution test B. use-diffusion test C. disk-dilution test D. disk-diffusion test