Which of the following is not a function of root hairs?
a. Increase the uptake of dissolved oxygen
b. Increase the uptake of carbon dioxide.
c. Increase the uptake of mineral ions.
d. Increase the uptake of soil water.
e. Increase surface area of the root system.
b
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Cardiac muscle has prolonged contraction due to a sodium induced-calcium released process into the cytoplasm of the cell. Cardiac cells can communicate through pore-like channels between cells. List the junction and the organelle involved in cardiac muscle contraction?
A. Adherens; Golgi apparatus B. Adherens; Rough ER C. Adherens; Smooth ER D. Gap; Golgi apparatus E. Gap; Rough ER F. Gap; Smooth ER
Glucose and sugars in DNA and RNA
a. have the same number of carbon atoms. b. have the same structural formulas. c. are the two components of sucrose. d. are monosaccharides. e. are both components of RNA
Natural killer cells destroy target cells by:
a. releasing antibiotics, which break down the cell membranes. b. releasing cytokines, perforins, and granzymes. c. releasing histamine, which signals other blood cells to aggregate. d. phagocytosis, after the cells are targeted by antibodies. e. releasing lysosomal enzymes, which digest the target cells.
Archaea and bacteria diverged:
a. about 3 billion years ago. b. about 100,000 millions years ago. c. about 1 billion years ago. d. about 2 billion years ago. e. about 10,000 million years ago.