Cells that have undergone homologous recombination for gene replacement would have which of the following gene combinations?
A. Only the cloned gene
B. Only the original gene
C. Both the cloned and original gene
D. Neither the cloned or original gene
A
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A common environmental organism that may even grow in certain chemical disinfectants is
A. Escherichia coli. B. Streptococcus pneumoniae. C. Pseudomonas aeruginosa. D. enveloped virus.
Quaternary ammonium compounds ("quats") are used for
A) antisepsis. B) disinfection. C) sterilization. D) quantifying antimicrobial activity. E) both antisepsis and disinfection.
Which of the following best describes a theory?
A. an experiment that is repeated over and over again B. a tentative explanation of natural phenomena C. a comprehensive explanation of natural phenomena supported by abundant evidence D. a well-known fact
Which of the following statements below is the best explanation of why MyoD can cause fibroblasts to express muscle-specific genes?
(a) Unlike some other cell types, fibroblasts have not lost the muscle-specific genes from their genome (b) The muscle-specific genes must be in heterochromatin in fibroblasts (c) During their developmental history, fibroblasts have accumulated some transcriptional regulators in common with differentiating muscle cells (d) The presence of MyoD is sufficient to activate the transcription of muscle-specific genes in all cell types