The upper layer of warm, low-density water of an open body of water is called the ________
Fill in the blank(s) with correct word
epilimnion
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Explain the need for a null hypothesis, especially in ecology and evolution. What does a null hypothesis accomplish?
What will be an ideal response?
A square meter of fertile soil contains trillions of bacteria
a. True b. False
Class II MHC genes code for
A. all HLA antigens. B. certain secreted complement components. C. receptors located primarily on macrophages and B cells. D. self receptors recognized by T lymphocytes. E. All of the choices are correct.
The product of the p53 gene _____
A) inhibits the cell cycle B) slows down the rate of DNA replication by interfering with the binding of DNA polymerase C) causes cells to reduce expression of genes involved in DNA repair D) allows cells to pass on mutations due to DNA damage