Which of the following is a way to prevent attenuation and maintain virulence in a bacterium?
A) laboratory subculture
B) animal passage
C) polymerase chain reaction (PCR)
D) antibiotic therapy
Answer: B
Biology & Microbiology
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___________ are the building blocks of DNA.
A. genes B. double helices C. amino acids D. nucleotides E. chromosomes
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The world’s oldest continuously standing tree is a giant sequoia
Indicate whether the statement is true or false.
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The vessels in which you would find the
highest concentration of plasma proteins are the
a. venules. b. arterioles. c. capillaries. d. veins. e. arteries
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When E. coli cells produce the amino acid tryptophan, a cluster of five genes is transcribed together. This cluster of genes is referred to as the
A. trp operon. B. trp regulator. C. trp suppressor. D. trp transcriptional operator. E. trp promoter.
Biology & Microbiology