To Do: Title your page “Unit 1 Review” Number down your page 1-23. AP Bio Unit 1 Review 10.3.11 To Do: Title your page “Unit 1 Review” Number down your page 1-23.

1) How many neutrons does the isotope Na - 24 have? 11 Na 22.99 Sodium 11 23 12 13

2) How many protons and electrons does Na have? 23: 11 12: 11 11: 11 13: 11 11 Na 22.99 Sodium

3) Nitrogen-12 and Nitrogen-14 are examples of? ions neutrons isotopes valences molecules

4) Determine if Sr is a metal or nonmetal and what its ionic charge is knowing its valence electrons. 38 Sr 87.62 Strontium Metal: -2 Metal: +2 Metal: -1 Metal: +1

5) DNA is composed of building blocks called _____. nucleic acids Gs nucleotides adenines amino acids

6) What element is found in all organic compounds? carbon oxygen helium iron nitrogen

7) This atom can form up to _____ single covalent bond(s). 1 2 3 4

8) Which figure correctly illustrates bonding in H2O?

9) The brackets are indicating a(n) _____ bond. ionic polar covalent single (nonpolar) covalent hydrophobic hydrogen

10) Each water molecule is joined to _____ other water molecules by ____ bonds. two ... hydrogen four ... hydrogen three ... ionic four ... polar covalent two ... polar covalent

11) Why isn't this insect drowning? Surface tension. The insect is very light. It is difficult to change the temperature of water. The insect is swimming. The insect is flying just above the water surface.

12) How does the pH of the solution on the right compare with that of the solution on the left? The solution on the right is neutral relative to the solution on the left. Both of these solutions are equally acidic. The solution on the right is basic relative to the solution on the left. Both of these solutions are equally basic. The solution on the right is acidic relative to the solution on the left.

13) Which one of these is an amino group? B D E A C

14) Which one of these is a hydroxyl group? B D E A F

15) Which one of these is a phosphate group? B D E A C

16) Which one of these behaves as an acid?

17) Glycogen is _____. the form in which plants store sugars a polysaccharide found in animals a polysaccharide found in plant cell walls a transport protein that carries oxygen a source of saturated fat

19) This figure is an example of a(n) _____. nucleic acid protein saturated fat unsaturated fat steroid

20) What type of bond joins the monomers in a protein's primary structure? ionic hydrophobic peptide S—S hydrogen

21) Which of these illustrates the secondary structure of a protein?

22) Enzymes work by _____. adding a phosphate group to a reactant decreasing the potential energy difference between reactant and product adding energy to a reaction increasing the potential energy difference between reactant and product reducing EA

23) As a result of its involvement in a reaction, an enzyme _____. loses a phosphate group permanently alters its shape loses energy is unchanged is used up