Production of enterotoxin is a characteristic of ________.

A) Clostridium botulinum
B) Clostridium perfringens
C) Clostridium difficile
D) Clostridium tetani
E) All of the choices are correct.


Ans: C) Clostridium difficile

Biology & Microbiology

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The organism Caenorhabditis elegans, a member of the phylum ____, is an important model organism

for studies of the genetic control of development.

a. Arthropoda b. Onychophora c. Nemertea d. Annelida e. Nematoda

Biology & Microbiology

Which of the following is a hominin?

a. chimpanzee b. Australopithecus c. baboon d. bonobo e. gorilla

Biology & Microbiology

The taxonomic subdivisions from largest to smallest are 

A. kingdom, phylum, class, order, family, genus, species. B. kingdom, class, phylum, order, genus, family, species. C. kingdom, phylum, order, class, family, genus, species. D. kingdom, order, class, phylum, genus, family, species.

Biology & Microbiology

Bush beans grow as small bushes rather than as vines because their internodes are short and they branch close to the apical meristem. Which substance, if applied to a bush bean, might cause it to elongate its internodes and grow as a vine?

A) a cytokinin B) a gibberellin C) abscisic acid (ABA) D) ethylene

Biology & Microbiology