Flowering plants constitute ____ percent of all modern plant species
a. 30
b. 50
c. 60
d. 75
e. 90
ANSWER: e
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How did researchers determine the proteins involved in the secretory pathway?
a. interfering with the translation of proteins and examining the cell's ability to transport fluorescently tagged proteins b. adding a detergent to the cells to lyse the membranes and examining transport of fluorescently tagged proteins c. genetically engineering mutations in genes and measuring changes in Golgi complex morphology d. treating cells with inhibitors of the secretory pathway and measuring changes in Golgi complex morphology e. altering the pH of the media to selectively regulate different enzymes and measuring changes in Golgi complex morphology
Which embryonic cell layer develops into the lining of the gut in most eumetazoans?
a. mesoderm b. epiderm c. mesoglea d. endoderm e. ectoderm
Proteolytic processing of eukaryotic proteins involves:a
removal of a portion of the polypeptide chain from an inactive protein precursor. b. the addition of one or more functional groups to a precursor protein. c. the removal of one or more functional groups from a precursor protein. d. removal of histones. e. removing the cap and tail of a newly synthesized protein.
A difference between a grassland and a savanna is
A. the pattern of rainfall. B. fire. C. carnivores. D. decomposers.