The binding of arabinose to the AraC protein allows it to form a loop in the DNA upstream of the ara operon promoter.
Answer the following statement true (T) or false (F)
False
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Hyphae are tubular cell walls that surround the cytoplasmic membrane
Indicate whether the statement is true or false.
The dinoflagellate Pfisteria is an important protist. Which of the following statements DOES NOT describe its attributes?
A. It causes nervous disorders in humans. B. It uses toxins to attack fish which it then consumes. C. It lies dormant on the bottom until stimulated by chemicals from fish. D. It is a major cause of food poisoning in humans. E. Its toxins damage fish skin thereby increasing exposure to the pathogen.
Conservation biology is a ______
a. mature science b. young science c. science that addresses speciation rates d. science practiced by environmentalists e. declining science
Which statement summarizes the distinction between nonpolar and polar covalent bonds?
A. The difference in electronegativity of the atoms in a nonpolar covalent bond is very large. B. The electrons are more evenly and symmetrically distributed in orbit among atoms in a nonpolar covalent bond. C. The electrons are more evenly and symmetrically distributed in orbit among atoms in a polar covalent bond. D. Polar covalent bonds are formed when the atoms gain or lose electrons to bond and become oppositely charged ions.