Transcript Quiz review

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 ions
acid releases hydrogen H+, burns
base releases hydroxide OH–, slimy
A protein containing more than one
polypeptide chain exhibits the
__________ level of protein structure.
A)
B)
C)
D)
E)
primary
secondary
tertiary
quaternary
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. B
2. A
3. C
4. A
5. C
6. C
7. D
8. C
9. D
10. D
11. B
12. C
13. A
14. B
15. D
16. B
17. A
18. A
19. A
20. A