Quiz #1 review

A pharmaceutical company hires a chemist to analyze the purity of the water being used in its drug preparations. If the water is pure, the chemist would expect to find

A) only molecules of H2O. B)H2O molecules and H+ ions. C) H2O molecules and OH– ions. D) H2O molecules, H+ ions, and OH– ions. E) only H+ ions and OH– ions.

Water also forms ions sometimes

H2O ↔ H+ + OH-

• Spontaneously happens to water molecules

• 1/ 107 water molecules are ionized in distilled water

• In dH2O, [H+ ]= [OH-]

salt - neutral molecule releases ionsacid releases hydrogen H+, burnsbase releases hydroxide OH–, slimy

A protein containing more than one polypeptide chain exhibits the

__________ level of protein structure. A)primary B)secondary C) tertiary D) quaternary E) infinite

Proteins have four levels of structure

• Primary• Secondary• Tertiary• Quaternary• Protein structure

depends on all these levels of interaction

• Which one of the following cells would have the greatest surface-to-volume ratio?

A) bacterium B) human red blood cell C) human muscle cell D) frog egg E) ostrich egg

Cells are small for good reason• Surface area:

volume ratio• Rate of

food/oxygen entering the cell depends on surface area

• For large volumes, this rate would approach zero

The rest of the answers so you can practice

1. B2. A3. C4. A5. C6. C7. D8. C9. D10. D

11. B12. C13. A14. B15. D16. B17. A18. A19. A20. A