What is the relationship between the promoters for antisense RNA and the promoters of their target genes?
A) The promoters are oriented so that they transcribe opposite strands of the same segment of DNA.
B) The promoters are found in different chromosomal regions but are controlled by the same sigma factors.
C) The sense and antisense RNAs use the same promoter, both RNAs are produced from a single transcript that is processed.
D) The sense and antisense RNAs are transcribed using the same promoter that is bidirectional.
A) The promoters are oriented so that they transcribe opposite strands of the same segment of DNA.
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The ________ model is used to describe the simultaneous polymerization and depolymerization of microtubules.
Fill in the blank(s) with the appropriate word(s).
Evaluation of the quality of the sputum specimen sent to the laboratory for bacterial culture is best performed by:
a. measuring the amount of mucus found. b. checking for mucus or blood. c. microscopically examining the Gram-stained smear for leukocytes. d. microscopically examining the Gram-stained smear for squamous epi-thelial cells.
Which of the following methods do fungi use in order to penetrate the initial layer of a plant's defenses?
A. mechanical bridging B. sharp mouthparts C. entry through stomates D. secretion of phospholipids to dissolve the cuticle
Over 90% of Staphylococcus aureus isolates are penicillin-resistant. Why?
A) They have loosely organized polysaccharide slime layers which protects their cell wall. B) They produce coagulase. C) They have a coating of protein A. D) They produce ?-lactamase. E) They produce staphylokinase.