Which of the following describes the gel electrophoresis technique?
a. Separating molecules based on their size and charge
b. Making multiple copies of DNA for further analysis
c. Creating multiple copies and expressions of genes
d. Modifying an organism’s DNA to achieve certain traits
a. Separating molecules based on their size and charge
a. Separating molecules based on their size and charge
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Phylogenetic trees are usually constructed using either a distance-based ________ approach, or a characteristic ________ approach.
Fill in the blank(s) with the appropriate word(s).
The 30 nm fiber is formed from arrays of nucleosomes
Indicate whether the statement is true or false
Opportunists or opportunistic pathogens
A. are usually saprophytes. B. take advantage of special circumstances. C. are usually mutualistic. D. always cause disease.
Air enters human lungs from the mouth by passing through the ________.
A. posterior air sacs B. esophagus C. nasal cavities D. trachea E. diaphragm