When studying an ancient ecosystem's organisms, what was the advantage of looking for DNA samples in permafrost?
A. The freezing temperature preserves the DNA.
B. The enzymes that make DNA are still active in the cells.
C. Areas with permafrost are older than other parts of the world, allowing scientists to collect samples back 1.5 to 2 million years.
D. It is easier to take solid core samples.
E. Most plants and animals evolved in Siberia.
A. The freezing temperature preserves the DNA.
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How do lycophytes differ from bryophytes?
A. Lycophytes have tracheids. B. Lycophytes produce seeds. C. Lycophytes use flowers for reproduction. D. The dominant stage in a lycophyte is the gametophyte.
Alzheimer disease has been shown to be related to_______
a. alcoholic fermentation in the brain d. decreased brain metabolism b. lactate fermentation in the brain e. increased mitochondrial enzyme activity c. increased brain metabolism
When one animal makes a sacrifice to support or benefit another, we call this ________
A) mutual benefit B) selfishness C) altruism D) spite
In a pedigree chart, a ____________ disease affects individuals every other generation.
Fill in the blank(s) with the appropriate word(s).