A well-substantiated explanation of some aspect the natural world, based on a body of facts that have been repeatedly confirmed through observations and experiments, is referred to as a(n) ________
A) idea
B) hypothesis
C) theory
D) fact
C
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Endosymbiosis of cyanobacteria is widely accepted as an explanation for the development of chloroplasts. The presence of endosymbiotic cyanobacteria provided a cell with the advantage of ________.
A. a membrane-bound nucleus B. tolerance to oxygen C. an electron transport chain D. simple, rapid gene transfer E. photosynthesis
________ consume organic molecules to live.
A. Autotrophs B. Plants C. Heterotrophs D. Hemitrophs E. Photoautotrophs
____ epithelial tissue is only one cell layer thick
a. Stratified b. Dense connective c. Loose connective d. Simple e. Cuboidal
If the syringe contains live S strain
Streptococcus pneumoniae a. the mouse will die. b. live R strain will be detected in the mouse's blood. c. the mouse will live. d. no live S strain will be detected in the mouse's blood. e. the live S strain bacteria will lose their pathogenicity.