Dna & Genes

Topics: DNA, DNA replication, Mutation Pages: 10 (2455 words) Published: March 28, 2011
DNA and the Gene: Synthesis and Repair

1) Watson and Crick elucidated the structure of DNA in 1953. Their research built on and helped explain the findings of other scientists, including ________. A) X-ray diffraction studies by Rosalind Franklin and Maurice Wilkins. B) Chargaff's rules: C = G and T = A.

C) Scientists who recognized that a nucleotide consisted of a sugar, a phosphate, and a nitrogen-containing base. D) All of the above were important considerations in the elucidation of the structure of DNA. All were included to incorporate the structure of DNA.

2) Hershey and Chase set out to determine what molecule served as the unit of inheritance. They completed a series of transduction experiments in which E. coli was infected by a T2 virus. Which molecular component of the T2 virus actually ended up inside the cell? A) protein

B) carbohydrate
C) lipid
The experiment was to see if DNA or protein ended up inside the cell. The book states that protein did not enter therefore the answer is D.

3) The transduction experiments done by Hershey and Chase, and the transformation experiments done by Griffith, supported the same conclusion, which was ________. A) Pathogenic molecules affect the health of all living organisms. B) DNA is the molecular substance of genetic inheritance.

C) Organisms must be sacrificed for science to progress.
D) Genetic recombination in living organisms is rare.
None of the other answers had anything to do with the question

4) How does the simple primary and secondary structure of DNA hold the information needed to code for the many features of multicellular organisms? A) The hydrogen bonding among backbone constituents carries coded information. B) The base sequence of DNA carries all the information needed to code for proteins. C) The covalent bonding among backbone constituents contains the information that is passed from generation to generation. D) The amino acids that make up the DNA molecule contain the information needed to make cellular proteins. All the other answers are incorrect

5) The fact that within a double-stranded DNA molecule, adenine forms two hydrogen bonds with thymine and cytosine forms three hydrogen bonds with guanine is known as ________. A) semi-conservative replication.

B) complementary base pairing.
C) secondary structure of a DNA molecule.
D) a double helix.
Complementary base pairing is the only correct term for the definition given

6) Semiconservative replication involves a template. What is the template? A) single-stranded binding proteins
B) DNA polymerase contains the template needed.
C) one strand of the DNA molecule
D) an RNA molecule
Template is a mold of one strand of DNA used to replicate which makes the answer C

7) DNA is synthesized through a process known as ________.
A) semiconservative replication.
B) conservative replication.
C) dispersive replication.
D) transcription.
All the other answers are incorrect…….the book only states that DNA is synthesized by semiconservative replication

8) Who performed the classic experiments that proved DNA was copied by semiconservative replication? A) Watson and Crick
B) Meselson and Stahl
C) Hershey and Chase
D) Franklin and Wilkins
B is the best answer of the pair of people who performed the experiment.

9) In the polymerization of DNA, a phosphodiester bond is formed between a phosphate group of the nucleotide being added and ________ of the last nucleotide in the polymer. A) ATP
B) C6
C) the 3′ OH
D) a nitrogen from the nitrogen-containing base
All of the other answers are irrevelant to the question

10) DNA contains the template needed to copy itself, but as you learned in Chapter 4, it has no catalytic activity. What catalyzes the formation of phosphodiester bonds between adjacent nucleotides in the DNA polymer being formed? A) ribozymes

B) DNA polymerase
D) deoxyribonucleotide triphosphates...
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