Which have a collagen cuticle, a pseudocoelom, a tubular digestive system and no respiratory or circulatory organs?
a. roundworms
b. cnidarians
c. flatworms
d. annelids
e. porifera
a
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Place the steps of biofilm formation in the correct order. _____ Surface (substratum) is preconditioned by environmental molecules. _____ Quorum sensing and the establishment of the extracellular matrix commences as microbes attach more stably. _____ Biofilm matures and some microorganisms escape to the planktonic state. _____ Microbes attach and detach from the preconditioned surface.
Fill in the blank(s) with the appropriate word(s).
The enzyme that inserts the correct bases in a growing nucleotide chain in a replicating DNA molecule is
A) RNA polymerase. B) DNA ligase. C) DNA polymerase. D) helicase.
Many clinical microbiology laboratories and public health laboratories use techniques such as microbial staining, microbial growth, enzymatic testing, fermentation testing, and microscopic analysis to identify pathogens in samples. Which categories of classical characteristics for taxonomy are represented here? (Check all that apply.)
A. Biochemical characteristics B. Molecular characteristics C. Physiological and metabolic characteristics D. Morphological characteristics
Which structures produce goosebumps?
A. cuticles B. hair follicles C. sudoriferous glands D. arrector pili muscles E. sebaceous glands