PCR enables scientists to do all of the following EXCEPT
A) sequence the bases within a gene as it is being copied.
B) use a very small amount of DNA as starting material.
C) make gene copies quite cheaply.
D) make billions of copies of a particular gene.
E) make gene copies very rapidly.
A
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Arteries carry ____
a. blood toward the heart b. blood away from the heart c. only oxygen-rich blood d. only oxygen-poor blood e. a combination of more than one of these
What organism is at the first trophic level in a tallgrass prairie ecosystem?
a. birds b. grasshoppers c. grasses d. decomposers e. parasites
Histology is the study of
a. cells. b. organelles. c. tissues. d. organisms.
What does this figure suggest is responsible for increasing species diversity?
A) time alone B) increasing leaf litter C) decreasing leaf litter D) increase in agriculture