A buffer system consists of A. a weak acid and its conjugate base. B. a weak acid and a proton donor. C. a weak acid and a proton. D. a weak base and a proton acceptor.

In the human body,the -log of the hydrogen ion concentration ([H+]) is regulated by  a. pH b. Acidity c.Alkalinity d.Bicarbonate ion e. Buffer system

Which factors will cause protein denaturation? Group of answer choices a. aqueous phosphate buffer b. heavy metals - Hg2+, Pb2+, Ag+ c. small metal ions - Na+, Ca2+, Cl- d. changes in pH e. use of detergents or soaps f. Tris a buffer commonly used with proteins

The inside of a cell contains several buffers. These buffers help ensure that Select one: a. pH inside the cell changes rapidly to balance pH changes outside the cell b. pH inside the cell remains at equilibrium with the pH outside the cell c. pH inside the cell changes rapidly to help maintain the environment outside the cell d. pH inside the cell remains stable when extracellular pH changes

Three proteins with an overall charges of 0, -5, and -8 are passed through an anion exchange column equilibrated in a buffer with low ionic strength and eluted with an increasing gradient of salt in a buffer. Which protein will elute last from the column? 1. Protein with no charge. 2. Protein with eight negative charges. 3. Protein with five negative charges. 4. Both charged proteins will elute at the same time.

A base a. has a value below 7 on the pH scale. b. is a chemical that adds hydrogen ions to a solution. c. has a value of 7 on the pH scale. d. is a chemical that absorbs hydrogen ions from a solution.

7. Which of the following is a valid buffer? A. 0.30 M HNO; and 0.30 M NaNO, B. 0.20 M HF and 0.10 M KF C. 0.15 M NaOCN and 0.15 M KCN D. 0.15 M HBr and 0.25 M NaBr

Relative tonicity compares the _____________ of two environments.  A. Solute concentration B. Solvent concentration C. Difference in types of solutes D. Difference in types of solvents

Based on how the water molecules are surrounding the two ions (labeled A&B), you can tell that (highlight or bold your response): lon A is (positive | negative | neutral) b. lon B is (positive | negative | neutral) If ions A and B were bonded together, what type of bond would they share? а. C.

Which of the following statement(s) about acids and bases is incorrect? a. acids and bases are both electrolytesb. acids are proton acceptors, releasing H+ in solutionc. bases are proton donors, taking up H+ in solutiond. a and be. b and c