Biochem Quiz 1

1. A nucleoside is made up of a

Base

Base and phosphate

Base and ribose

Ribose and phosphate

2. ________ are a fused ring with a 5-member imidazole while _________ are 6-member rings

Pyrimidines; Purines

Purines; Pyrimidines

Adenine; Guanine

Uracil; Cytosine

3. Which bond is the strongest?

H-Bonds

Ionic Bonds

Van der Waals

Covalent Bonds

Hydrophobic interactions

4. All of the following atoms are nucleophillic (eletron rich) except for

F

O

N

C

5. All of the following are true about DNA double helix except

Right hand coil

Held together by H-bonds

2 non-complementary anti-parallel strands

Bases are interior of helix

Phosphate and sugar groups cause negative charge on the outside

6. What is Chargaff's Rules?

4 bases are equal

Base composition is the same from species to species

Purines equal pyrimidines

Purines equal purines

7. What kind of bond is between the C1 of the pentose and N1 of pyrimidines or N9 of purines?

Ionic

Linoleic

Phsophodiester

Hydrogen

Beta-N-glycosidic

8. All the following are true about nucleoside triphosphate functions except

ATP - universal chemical energy in cells

GTP - protein biosynthesis and signaling

UTP - Activation in protein biosynthesis

CTP - activation of P-lipid biosynthesis

Coenzeymes - nucleotide derivatives