Once bound to a hormone, this receptor becomes active and catalyzes the transfer of a phosphate group to itself or intracellular proteins.
A. G-protein coupled receptor
B. enzyme-linked receptor
C. ligand-gated ion channel receptor
D. mechanoreceptor
E. thermoreceptor
B. enzyme-linked receptor
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Why is DNA resistant to hydrolysis under alkaline conditions?
A. DNA lacks the 3' hydroxyl on the pentose ring, which would have participated in the hydrolysis. B. Deoxyribose forms furanose rings without oxygen, which makes the ring more stable. C. The 2' hydroxyl of the sugar is directly involved in the hydrolysis reaction, and DNA lacks this group. D. The carbonyl of uracil is directly involved in the hydrolysis reaction and DNA lacks this base. E. None of these choices is correct.
The production of natural carbon dioxide by yeasts after a wine is bottled results in ________.
A. sweet wine B. brandy C. champagne D. dry wine
__________ are thickened underground stolons used
for nutrient storage. a. Stolons b. Rhizomes c. Bulbs d. Corms e. Tubers
Which of the following is true about the chemical bonds found in proteins and nucleic acids?
A. Covalent bonds result when an electron is completely transferred to another atom such that the atoms are drawn together by electrostatic charges. B. Ionic bonds result when two atoms share electrons equally. C. Atoms having a small difference between their electronegativities are more likely to form covalent bonds. D. Ionic bonds are most likely to form between two metal atoms. E. The strength of a covalent bond can vary with the salt concentration of the environment.