Disruption of the normal microbiota can result in infections caused by which of the following microbes?
A) Mycobacterium
B) Candida albicans
C) Clostridium difficile
D) both Mycobacterium and Clostridium difficile
E) Candida albicans, Mycobacterium, and Clostridium difficile
E
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Determining the functional nature of a microbial community by analysis of bulk DNA samples extracted from environmental samples may be misleading for all of the following reasons EXCEPT
A. the DNA obtained can depend on the extraction method used. B. some of the DNA may be from non-functional entities such as spores. C. DNA is of little use in identifying unknown microbes. D. some of the DNA recovered may be from non-living organisms.
Which of the following statements describes proteobacteria?
a. Gram-negative and includes the purple bacteria b. Gram-negative and includes the green bacteria c. Gram-positive and includes the purple bacteria d. Gram-positive and includes the green bacteria e. Gran-neutral and includes the green bacteria
Pr is located in the ____, and after it absorbs red light, the resulting Pfr moves to the ____
a. endoplasmic reticulum; plasma membrane b. cytoplasm; nucleus
c. plasma membrane; cytoplasm d. cytoplasm; plasma membrane e. nucleus; cytoplasm
What accounts for the great amount of diversity in antibodies?
A. Multiple gene segments coding for the light and heavy chains of an antibody are located on different chromosomes and rearranged independently B. The combining of different light and heavy chains in the assembly of different immunoglobulin molecules C. The DNA rearrangement of the multiple light and heavy chain genes D. Mutations E. All of the choices are correct