DNA and Chromosome - Molecular Biology Chapter 5 Quiz
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Questions and Answers

What is the main reason why it was difficult for scientists to accept DNA as the genetic material?

Due to the apparent simplicity of its chemistry

How many long polynucleotide chains make up DNA?

Two

What are the four building blocks that make up DNA?

Four nucleotide building blocks

What enables base pairs to be packed in a favorable arrangement?

<p>Complementary base-pairing</p> Signup and view all the answers

What kind of information does DNA encode?

<p>Nucleotide sequences</p> Signup and view all the answers

What is the role of histones in relation to DNA?

<p>Specialized protein binds and folds DNA, preventing it from getting tangled.</p> Signup and view all the answers

How was the genetic material (DNA) of T2 virus identified in infected cells?

<p>By radiolabeling both the envelope protein and DNA of T2, then centrifugating the batch and determining that only the DNA label remained in infected cells.</p> Signup and view all the answers

What happens to double-stranded DNA molecules during cell division?

<p>They are packaged into chromosomes, which are then equally distributed to the two daughter cells.</p> Signup and view all the answers

What is the term for the combination of a protein with its specific shape at the active site?

<p>Recognition</p> Signup and view all the answers

What is the significance of studying Streptococcus pneumoniae in the context of DNA splicing?

<p>Streptococcus pneumoniae is a bacteria that causes pneumonia and provides insight into gene expression and genome study.</p> Signup and view all the answers

What is the term used to describe the large excess of interspersed DNA in chromosomes?

<p>Junk DNA</p> Signup and view all the answers

What marks the ends of each chromosome and allows duplicated chromosomes to be separated during the M phase?

<p>Telomeres</p> Signup and view all the answers

Why is it important to identify the genetic material injected by T2 virus into its bacterial host cell?

<p>Identifying the genetic material helps in understanding the mechanisms of infection and how the virus takes control of the host cell.</p> Signup and view all the answers

What is the first and most fundamental level of chromatin packing?

<p>Nucleosome</p> Signup and view all the answers

How many histone proteins are present in an individual nucleosome core particle?

<p>8</p> Signup and view all the answers

What are the two types of RNA, in addition to transfer RNA, that are part of the final product along with DNA?

<p>Ribosome RNA (microRNA)</p> Signup and view all the answers

What is the function of the Fifth histone H1?

<p>Pulls adjacent nucleosomes together into regular repeating arrays</p> Signup and view all the answers

How does the ATP-dependent complex in molecular biology contribute to stability?

<p>The complex uses ATP hydrolysis energy to change the position of DNA wrapped around nucleosomes, making DNA more or less accessible.</p> Signup and view all the answers

What are the Covalent modifications performed by histone-modifying enzymes?

<p>Addition or removal of acetyl (Ac), phosphate (P), or methyl groups (M)</p> Signup and view all the answers

Which type of chromatin is most highly condensed in interphase?

<p>10% of interphase chromatin</p> Signup and view all the answers

What is the role of gene silencing in molecular biology?

<p>Transmit patterns of gene expression without altering the nucleotide sequence of DNA</p> Signup and view all the answers

What type of controls are involved in post-transcriptional regulation?

<p>Post-transcriptional controls</p> Signup and view all the answers

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