bio DNA

 

Which of the following is a nucleotide found in DNA?

• ribose + phosphate group + thymine

• ribose + phosphate group + uracil

• deoxyribose + phosphate group + cytosine

• deoxyribose + phosphate group + uracil

Because of base pairing in DNA, the percentage of

• adenine molecules in DNA is about equal to the percentage of guanine molecules.

• pyrimidines in DNA is about equal to the percentage of purines.

• purines in DNA is much greater than the percentage of pyrimidines.

• cytosine molecules in DNA is much greater than the percentage of guanine molecules.

1) In his transformation experiments, what did Griffith observe?

• Infecting mice with nonpathogenic strains of bacteria makes them resistant to pathogenic strains.

   

• Mutant mice were resistant to bacterial infections.

• Mixing a heat-killed nonpathogenic strain of bacteria with a living pathogenic strain makes the pathogenic strain nonpathogenic.

• Mixing a heat-killed pathogenic strain of bacteria with a living nonpathogenic strain can convert some of the living cells into the pathogenic form.

What is meant by the term semi-conserved?

• The original DNA strands are completely conserved when DNA replicates?

• Fragments of the original DNA are seen scattered throughout the new DNA Strand.

• When DNA replicates each strand gets half the original strand and half a newly assembled strand.

• The new DNA strand is made completely of original DNA

What percentage of the DNA molecule is made up of Purines?

• 20%

• 40%

• 50%

• 30%

What side of the nucleotide does DNA polymerase add new nucleotides to the growing strand

• both

• 3' end

• 5' end

• neither

 In trying to determine whether DNA or protein is the genetic material, Hershey and Chase made use of which of the following facts?

• RNA includes ribose, while DNA includes deoxyribose sugars.

• DNA contains phosphorus, but protein does not.

• DNA contains purines, whereas protein includes pyrimidines.

• DNA contains sulfur, whereas protein does not.

If you have 30% Guanine, what percent of Thymine do you have?

• 10%

• 20%

• 30%

• 40%

Which base is not found in DNA?

• Adenine

• Thymine

• Uracil

• Cytosine

Which of the following investigators was/were responsible for the following discovery? In DNA from any species, the amount of adenine equals the amount of thymine, and the amount of guanine equals the amount of cytosine.

• A) Erwin Chargaff

• B) Oswald Avery, Maclyn McCarty, and Colin MacLeod

• D) Frederick Griffith

• E) Alfred Hershey and Martha Chase