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

Biology & Microbiology

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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.

Biology & Microbiology

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

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Cell membranes are composed principally of

a. carbohydrates. b. nucleic acids. c. lipids. d. proteins.

Biology & Microbiology

________ 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

Biology & Microbiology