The chemical nature of exotoxins is that of a
A. protein.
B. carbohydrate.
C. lipid.
D. lipopolysaccharide.
A
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What does the ABC model of flower development attempt to explain?
A) how different combinations of gene products trigger the formation of different floral organs B) why petals are found on the inside of the whorl of sepals instead of on the outside C) why the four types of floral organs occur in whorls D) why apical meristems are converted to floral meristems in response to specific cell-to-cell signals
What type of thinking is required?
What will be an ideal response?
Water has an unusually high boiling point for its molecular weight because water molecules
a. are very dense. b. get much heavier as they are heated. c. are held to each other by hydrogen bonds. d. are held together by covalent bonds. e. form hydration layers.
If you eliminated all sources of calcium (dairy
products, some vegetables) from your diet, the level of which of the following would rise in an attempt to supply calcium stored in your body to the tissues that need it?
a. aldosterone b. calcitonin c. mineralocorticoids d. parathyroid hormone e. GH