Which of these conditions would not affect the ability of Streptococcus mutans to attach to teeth?

A) the absence of Actinomyces, a bacterium that can be part of dental plaque
B) the lack of sucrose
C) the lack of the enzyme glucosyltransferase
D) the inability to form dextran
E) the lack of a glycocalyx


Ans: A) the absence of Actinomyces, a bacterium that can be part of dental plaque

Biology & Microbiology

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Mendel demonstrated which of the following about inherited traits? Check all that apply. 

_____ traits can be hidden in some generations, but subsequently reappear unchanged in future generations. _____ traits segregate among the offspring of a cross. _____ certain traits are more likely to appear than their alternatives. _____ some traits show blending inheritance. _____ parents that both have the same trait can have offspring with an alternative trait.

Biology & Microbiology

Iron-reducing bacteria are obligately aerobic organisms that reduce ferric iron and oxidize hydrogen or organic compounds

Indicate whether the statement is true or false.

Biology & Microbiology

Which of the following best describes the photosynthetic membranes of the purple nonsulfur bacteria?

A. The photosynthetic membranes are not associated with the plasma membrane. B. The photosynthetic membranes are continuous with the plasma membrane. C. The photosynthetic membranes are attached to the plasma membrane but not continuous with it. D. There are no photosynthetic membranes in the purple nonsulfur bacteria.

Biology & Microbiology

Polyclonal antibodies are those that:

a. react with many different types of anti-gens. b. react with many species of bacteria within the same genus. c. react with many different antigens of one specific organism. d. can be produced from many different spe-cies of host organisms.

Biology & Microbiology