For most metazoans, what is the name of the middle tissue layer during development?
a. mesoglea
b. epiderm
c. mesoderm
d. ectoderm
Ans: c. mesoderm
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Target nucleic acid amplification (polymerase chain reaction [PCR]) methods are based on:
a. the ability of two nucleic acid strands that have complementary base sequences to bond specifically with each other and form a double-stranded molecule. b. detecting phenotypic traits not detectable by conventional strategies. c. the principles of complementary nucleic acid hybridization with those of nucleic acid replication that are repeatedly applied through numerous cycles. d. determining the exact nucleotide sequence of a gene or gene fragment obtained from an organism.
The isolation of a small gram-positive, catalase-positive rod with a narrow zone of hemolysis isolated from blood or CSF should be used as strong presumptive evidence for:
a. listeriosis. b. diphtheria. c. pertussis. d. tetanus.
What is the role of amylase?
a. converting starches to maltose b. synthesizing nutrients in the body c. buffering the pH of food d. breaking down fatty acids
__________ increase the free surface area of
epithelia that absorb substances. Fill in the blank(s) with the appropriate word(s).