Which of the following leukocytes kills its target cells, such as cancer cells or virus-infected cells, by releasing chemicals that break down the target cell membrane?
A) natural killer cells
B) B lymphocytes
C) basophils
D) T lymphocytes
E) macrophages
A
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How do arbuscular mycorrhizae (AM) help plants obtain more nutrients from the soil?
A) Byproducts of AM metabolism serve as primary nutrient sources for the plants. B) The AM increase the total surface area to absorb more nutrients. C) The hyphae develop as specialized nodules that directly produce nutrients for the plant. D) Signaling molecules in the plant are passed to the AM to initiate electron flow, which is in turn used to create ATP.
Four of the five answers listed below are related by a common polluting action. Select the exception
a. power generated by coal b. power generated by water c. power generated by oil d. power generated by gas e. use of motor vehicles
Normal saline is which type of solution?
a. hypertonic b. hypotonic c. isotonic d. hemolytic
What are the guidelines to setting up a healthy diet?
A) eat a variety of foods B) choose foods high in saturated fats C) eat the right number of calories D) eat foods high in trans fat E) minimize sweets