In polymerase chain reaction technology, the two strands of DNA are separated by:
a. gel electrophoresis.
b. treating them with restriction enzymes.
c. centrifugation.
d. exposing them to high pH.
e. heating them.
E
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Arrange the following five events in an order that explains the mass flow of materials in the phloem
1. Water diffuses into the sieve tubes. 2. Leaf cells produce sugar by photosynthesis. 3. Solutes are actively transported into sieve tubes. 4. Sugar is transported from cell to cell in the leaf. 5. Sugar moves down the stem. A) 2, 1, 4, 3, 5 B) 1, 2, 3, 4, 5 C) 2, 4, 3, 1, 5 D) 4, 2, 1, 3, 5 E) 2, 4, 1, 3, 5
The optimum temperature is usually closer to the minimum temperature than the maximum temperature
Indicate whether the statement is true or false.
__________ are soils that have roughly equal proportions of sand, silt, and clay. Fill in the blank(s) with the appropriate word(s)
The mass number is the ____ rounded to the nearest whole number.
A. atomic mass B. number of protons C. atomic number D. number of electrons