DNA Denaturation
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Questions and Answers

Which process involves the synthesis of RNA using information from DNA?

  • Transcription (correct)
  • Mutation
  • Translation
  • Replication

What is the chemical nature of the genetic material?

  • Proteins
  • RNA
  • DNA (correct)
  • Lipids

What are the distinct units that transmit hereditary information?

  • Ribosomes
  • Chromosomes
  • Genes (correct)
  • Proteins

Who first observed chromosomes while studying dividing cells under the microscope?

<p>Walther Flemming (A)</p> Signup and view all the answers

What did Miescher call the material he extracted from white blood cells?

<p>Nuclein (A)</p> Signup and view all the answers

What did Avery and colleagues find was able to transform the R-strain bacteria into the S-strain?

<p>Nucleic acid (DNA) (C)</p> Signup and view all the answers

What did Hershey and Chase show is the genetic material of viruses?

<p>DNA (A)</p> Signup and view all the answers

Which form of DNA is the main form and is naturally occurring?

<p>B-DNA (A)</p> Signup and view all the answers

What is the biological significance of Z-DNA?

<p>Not well understood (A)</p> Signup and view all the answers

Which type of DNA is shorter and thicker than B-DNA?

<p>A-DNA (A)</p> Signup and view all the answers

What is the process called when DNA strands separate?

<p>Denaturation (C)</p> Signup and view all the answers

Which scientist used chromatographic methods to separate and quantify the relative amounts of the four bases in DNA?

<p>Chargaff (D)</p> Signup and view all the answers

What did Chargaff observe about the number of nucleotides in DNA samples?

<p>The number of A = the number of T (D)</p> Signup and view all the answers

What did Watson and Crick propose about the structure of DNA?

<p>It has a helical structure (A)</p> Signup and view all the answers

What holds the two strands of DNA together in the double helix?

<p>Hydrogen bonds (A)</p> Signup and view all the answers

Which technique was used to show that nucleosomes occur at 200-bp intervals?

<p>Electrophoresis (A)</p> Signup and view all the answers

What did Roger Kornberg and colleagues conclude about the histone complexes in nucleosomes?

<p>They remain intact under isolation procedures (C)</p> Signup and view all the answers

What technique did Kornberg and colleagues use to demonstrate their findings about nucleosomes?

<p>Chemical crosslinking (C)</p> Signup and view all the answers

Which two elements did Alfred Hershey and Martha Chase label in their experiments?

<p>Proteins and DNA (A)</p> Signup and view all the answers

What did Hershey and Chase conclude about the genetic material of the T2 phage?

<p>DNA was the genetic material of the phage T2 (B)</p> Signup and view all the answers

What is the role of reverse transcriptase in retroviruses?

<p>It catalyzes synthesis of DNA from RNA (B)</p> Signup and view all the answers

What is the provirus in the reproductive cycle of a retrovirus?

<p>The integrated viral genome (C)</p> Signup and view all the answers

Which type of DNA packaging is a challenge for all forms of life?

<p>Chromatin packaging (B)</p> Signup and view all the answers

What is the main bacterial genome called?

<p>Bacterial chromosome (A)</p> Signup and view all the answers

What type of proteins bind to the negatively charged DNA in eukaryotes?

<p>Histones (A)</p> Signup and view all the answers

What is the basic unit of chromatin structure in eukaryotes?

<p>Nucleosome (D)</p> Signup and view all the answers
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