DNA STRUCTURE AND REPLICATION QUIZ

DNA replication results in

two completely new DNA molecules

one new DNA molecules 1 old molecule

one new molecule of RNA

two DNA molecules such that each one contains a strand of the original

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One hypothesis of DNA replication suggested that the parental DNA molecules are broken into fragments. Both strands of DNA in each of the daughter molecules are made up of an assortment of parental and new DNA. This statement refers to which hypothesis?

Conservative theory

Dispersive theory

Evolutionary theory

Semi-conservative theory

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DNA helicase is used to

None of these

interact the double helix closely

break a phosphodiester bond in DNA strand

unwind the double helix

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Proteins involved in opening a replication bubble are

DNA helicases

single stranded binding proteins

ligase

DNA topoisomerase

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Overwinding or overtightening of DNA during replication is caused and removed by

Single stranded protein, DNAa

DNAb, DNA polymerase

DNAa, gyrase

DNAb, gyrase

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DNA segments capable of moving from one place in the genome to another is known as

moving elements

introns

retrovirus

transposons

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Which of the following is an active site on its single polypeptide chain for DNA Polymerase I?

5' → 3' polymerase

5' → 3' exonuclease

All of these

3' → 5' exonuclease

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Which of the following in DNA replication and transcription are common?

utilization the same enzyme

incorporation of deoxynucleotides

None of these

synthesis in the 5'-3' direction

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What is the main damaging effect of UV radiation on DNA?

Depurination

Formation of thymine dimers

Dehydration

Single strand break

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What is the name given to the points at which a DNA helix is unwound and new strands develop?

Replication origins

Replication forks

Okazaki fragments

Leading strands

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