Which of these is a key feature of the scientific method?
A. Scientific hypotheses must be testable.
B. Experiments need not be repeatable.
C. Science is moral.
D. Once a hypothesis has been proved, it can never be changed.
A. Scientific hypotheses must be testable.
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In an experiment described in a chemistry lab book, the directions state that after mixing two chemicals (A and B) and waiting 5 minutes that A will be oxidized. This means that:
A. chemical A has lost electrons to chemical B. B. chemical A has gained electrons from chemical B. C. chemical A has gained energy in the form of heat from chemical B. D. chemical A has lost energy in the form of heat to chemical B. E. chemical A has reacted with oxygen.
The lipids in the cytoplasmic membrane of Bacteria and ________ contain ester linkages, while the cytoplasmic membrane of ________ contain ether linkages
A) Archaea / Eukarya B) Archaea / fungi C) Eukarya / prokaryotes D) Eukarya / Archaea
Myofibrils are subdivided along their length by repeating units called ________, which are the fundamental contractile units of the muscle cell.
Fill in the blank(s) with the appropriate word(s).
Amphibians are thought to have evolved from
A. ray-finned fish. B. lobe-finned fish. C. spiny fish. D. skates and rays. E. annelids.