Which of the following statements about diphtheria is FALSE?
A) All species of Corynebacterium may be pathogenic.
B) Its toxin interferes with eukaryotic protein synthesis.
C) It produces a characteristic pseudomembrane that can adhere to tissues in the throat.
D) Its growth on Loffler's medium is used for absolute diagnosis of the bacterium.
E) Its toxin can be absorbed into the blood from cutaneous lesions leading to severe complications.
D
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Serological methods
A. are useful in identifying bacteria. B. rely on the specificity of an antibody-antigen interaction. C. may be simple and rapid. D. All of the choices are correct.
Which of the following statements is FALSE?
A) Salts readily dissolve in water. B) Water molecules are formed by hydrolysis. C) Water freezes from the top down. D) Water is formed as a part of a dehydration synthesis reaction. E) Water is a polar molecule.
The lacP site lies within the lac operon and is upstream of the genes that encode for proteins involved in lactose uptake and metabolism. Which of the following statements is TRUE of the lacP site?
A. It is the lac promoter site. B. It is where RNA polymerase binds. C. It is the site where genes are transcribed that encode proteins for metabolizing lactose. D. It is the lac promoter site where RNA polymerase binds. E. It is the lac promoter site, where genes are transcribed that encode proteins for metabolizing lactose.
Scientists believe that mitochondria may have evolved from bacteria because
a. they both have cristae membranes. b. mitochondria have their own DNA. c. the shapes and sizes are exactly the same. d. both are surrounded by a cell wall. e. both can live independently