Pasteur used swan-neck flasks in his experiments to prove that
A) Microorganisms could be grown in laboratory infusions
B) Microbial fermentation could be used to make wine
C) Microorganisms could cause disease
D) Air had 'vital forces' capable of spontaneous generation
E) Dust in air was a source of living microorganisms
E) Dust in air was a source of living microorganisms
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Which of the following statements about essential elements is FALSE?
a. An element with only one role in plant metabolism may still be essential. b. An essential element is necessary for normal growth and reproduction. c. Plant seeds in some cases contain enough of an essential element to sustain the adult plant. d. An essential element may occasionally be functionally replaced by another element. e. Some essential elements are required in only trace amounts.
The molecules of the mitochondrial electron transport chain are located:
A) in the stroma. B) in the mitochondrial matrix. C) in the intermembrane space. D) within in the inner membrane. E) in the cytoplasm.
The modern dog is descended from wolves. Humans selected animals with particular traits and bred them. This is an example of ____________.
a. artificial selection b. natural selection c. allopatric speciation d. stabilizing selection
The male gametophytes of seed plants consist of a few cells enclosed by a sturdy wall made mostly of the resistant
polymer ____.
a. sporopollenin b. xylan c. lignin d. cellulose e. pectin