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
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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
Which of the following is a hominin?
a. chimpanzee b. Australopithecus c. baboon d. bonobo e. gorilla
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.
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