When examining the hierarchy of life, which of the following terms is most inclusive?
a. population
b. species
c. biosphere
d. ecosystem
e. population
C
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The isoelectric point (pI) is:
A. the pH at which a protein has a net positive charge. B. the pH at which a protein has a net negative charge. C. the pH at which a protein has a net charge of zero. D. the distance a protein having a positive charge will travel in gel electrophoresis. E. the distance a protein having a negative charge will travel in gel electrophoresis.
External fertilization is common in most
a. insects. b. amniotes. c. lizards. d. bony fish. e. bony fish and insects
Electron flow may be photoprotective (protective to light-induced damage). Which of the following experiments could provide information on this phenomenon?
A) use mutated organisms that can grow but that cannot carry out cyclic flow of electrons and compare their abilities to photosynthesize in different light intensities against those of wild-type organisms B) use plants that can carry out both linear and cyclic electron flow, or only one or another of these processes, and compare their light absorbance at different wavelengths and different light intensities C) use bacteria that have only cyclic flow and look for their frequency of mutation damage at different light intensities D) use bacteria with only cyclic flow and measure the number and types of photosynthetic pigments they have in their membranes E) use plants with only photosystem I operative and measure how much damage occurs at different wavelengths
The term used to describe bacteria that are shaped like curved rods is ________.
A. coccus B. bacillus C. vibrio D. coccobacillus