Campylobacter thioglycollate broth serves which purpose when used in the bacterial fecal culture?
a. Evaluation of general flora and predomi-nant species
b. Selection of enteric pathogens such as Salmonella, Aeromonas, and others
c. Inhibition of normal flora and selection of enteric pathogens
d. Enrichment for Campylobacter spp.
D
Campylobacter thioglycollate–enrichment broth increases the yields of positive cultures for Campylobacter spp., although it is not necessary for routine use.
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Which statement is TRUE regarding protein synthesis?
A) Ribosomal proteins catalyze peptide bond formation in the growing polypeptide chain. B) The 23S rRNA catalyzes peptide bond formation in the growing polypeptide chain. C) Transfer RNAs catalyze peptide bond formation in the growing polypeptide chain. D) Messenger RNA catalyzes peptide bond formation in the growing polypeptide chain.
During both CAM and C4 photosynthesis, what is the role of the PEP carboxylase enzyme?
A. to create ATP B. to create HCO3 C. to create 3-carbon organic acids D. to create 4-carbon organic acids
CpG islands are associated with which of the following?
A. Nucleosome location B. DNA methylation C. Steroid hormone activity D. cAMP pathway
Lateral roots are the product of the
a. pericycle. b. vascular cylinder. c. epidermis. d. apical meristem. e. endodermis.