In tuberculosis, when a caseous lesion calcifies, it is called a ________.
A. tubercle
B. tuberculous cavity
C. Ghon complex
D. All of the choices are correct.
Answer: C
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Which of the following scenarios leads to the highest level of lac operon expression?
A. high glucose levels, lactose absent B. low glucose levels, lactose absent C. high glucose levels, lactose present D. low glucose levels, lactose present
Research on transgenic Drosophila models of Huntington disease has found that ____
a. the NUB1 protein decreases levels of mutant huntingtin protein, and thereby, cell death b. the mutant huntingtin protein is destroyed by the SOD1 protein c. Drosophila and humans share more than 90% of genes d. the accumulation of mutant proteins in the brain causes Huntington disease e. treatment of patients with Rhes protein cures Huntington disease
Scientific names of organisms consist of two English terms.
a. true b. false
Plasmids are distinguished from bacterial chromosomes in that
A. plasmids are circular, bacterial chromosomes are linear. B. plasmids occur in the cytoplasm, bacterial chromosomes occur in the nucleus. C. plasmids consist of single-stranded nucleic acids, bacterial chromosomes consist of double-stranded nucleic acids. D. plasmids have few genes, bacterial chromosomes have many genes. E. plasmids are composed of RNA, bacterial chromosomes are composed of DNA.