A.)Provided Evidence for the Semi Conservative Model of DNA Replication

A.)Provided Evidence for the Semi Conservative Model of DNA Replication

Unit 2
Supplemental Instruction
Iowa State University / Leader: / Landon
Course: / Biology 212
Instructor: / Dr. Vleck
  1. The DNA of an organism has thymine as 20 % of its bases. What percentage of its bases would be guanine?






  1. In their classic experiment, Meselson and Stahl

a.)Provided evidence for the semi conservative model of DNA replication

b.)Were able to separate phage protein coats from E. coli by using a blender

c.)Found that DNA labeled with 15N was of intermediate density

d.)Grew E. coli on labeled phosphorus and sulfur

e.)Found that DNA composition was species specific

  1. Watson and Crick concluded that each base could not pair with itself because

a.)There would not be enough room for the helix to make a full turn every 3.4 nm

b.)The uniform width of 2nm would not permit two purines or two pyrimidines to pair together

c.)The bases could not be stacked 0.34 nm apart

d.)Identical bases could not hydrogen bond together

e.)They would be on anti parallel strands

  1. Which of the following enzymes or proteins is paired with an incorrect function

a.)Helicase—unwind and separate parental double helix

b.)Telomerase—add telomere repetitions to ends of chromosomes

c.)Nuclease—cut out (excise) damaged DNA strand

d.)Primase—form DNA primer to start replication

5. Noncyclic electron flow produces

a.) equal amounts of ADP and NADP+

b.) equal amounts of ATP and NADP+

c.) equal amounts of ATP and NADPH

d.) 3:2 ratio of ATP and NADPH

e.) 3:2 ratio of ATP and NADH

6. What causes photorespiration?

a.) cool sunny weather

b.) high CO2 levels

c.) low CO2 levels

d.) low O2 levels

e.) low N2 levels

7. In what respect is the photosynthetic adaptation of C4 and CAM plants similar?

a.) an organic acid is produced

b.) The C3 cycle is no longer necessary

c.) The chloroplast is no longer needed

d.) Only photosystem I is necessary

e.) Both types of plants can make most of their sugar in the dark

f.) a and d

8. In analyzing the number of different bases in a DNA sample, which result would be consistent with the base pairing rules?

a.) C+G = T+A

b.) A+G = C+T

c.) A = C

d.) A+T = G+C

e.) G = T

f.) all of the above

9. What is NOT true about telomeres

a.) Found at the ends of eukaryote chromosomes

b.) contain genes

c.) shorten with each round of replication

d.) are multiple repeats of one short nucleotide sequence

e.) Found at the ends of prokaryote chromosomes

f.) Choices b and d are not true

g.) Choices b and e are not true

10. What is the energy source for polymerization during DNA replication ?

a.) the daughter strand

b.) the nucleotide

c.) primase

d.) DNA polymerase

e.) All of the above

11.The joining of nucleotides in the polymerization of DNA requires energy from

a.)DNA polymerase

b.)The hydrolysis of the terminal phosphate group of ATP

c.)RNA nucleotides

d.)The phosphate groups of the sugar-phosphate backbone.

e.)The hydrolysis of the pyrophosphates removed from nucleoside triphosphates