The bond in which bonded atoms share electrons is called a(n) ________
A) ionic bond
B) covalent bond
C) hydrogen bond
D) polar bond
B
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________ enables a single gene to encode two or more polypeptides that are different in their amino acid sequence.
A. Reverse transcription B. Self-splicing C. Capping D. Alternative splicing E. Regulatory splicing
If K+ can exit the cell through leak channels, why don't they flow out until there are equal concentrations on both sides of the membrane?
A. K+ can act as an enzymatic cofactor, and most K+ ions are bound to cellular enzymes. B. The leak channels allow a very slow leak that cannot keep pace with active import of K+ ions. C. Chelator molecules trap K+ on the inside of the membrane. D. The negative electrical potential inside the cell creates a force that holds the K+ ions in.
What is the raw material for photosynthesis?
a. sugar and water b. sugar and oxygen c. carbon dioxide and oxygen d. carbon dioxide and water
Cell membranes are composed principally of
a. carbohydrates. b. nucleic acids. c. lipids. d. proteins.