Which of these may pertain to the term strain?
A. E. coli 0157:H7
B. E. coli
C. Minor variation of a species
D. Major variation of a species
E. E. coli 0157:H7 AND minor variation of a species
E
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Which of the following is the correct sequence of blood flow in birds and mammals?
A) left ventricle ? aorta ? lungs ? systemic circulation B) vena cava ? right atrium ? right ventricle ? pulmonary vein C) pulmonary vein ? left atrium ? left ventricle ? pulmonary circuit D) vena cava ? right atrium ? right ventricle ? pulmonary artery E) right atrium ? pulmonary artery ? left atrium ? ventricle
A horizontal stem modified to penetrate the substrate and anchor a plant is a ____
a. sporangium b. rhizome c. vascular system d. protonema e. shoot system
Biological diversity is an index of the variety of living organisms in an ecosystem, and includes:a
species richness only. b. species richness, genetic diversity, and ecosystem diversity. c. species richness, biosphere diversity, and ecosystem diversity. d. population diversity and ecosystem diversity. e. genetic diversity only.
Small circular RNAs called ________ are plant pathogens
A) plasmids B) viruses C) viroids D) prions E) phages