DISEASE ASSOCIATED WITH IMMUNE SYSTEM QUIZ

The 5' and 3' numbers are related to the

the base pair rule

carbon number in sugar

the number of phosphates

length of the DNA strand

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

Replication forks

Okazaki fragments

Leading strands

Replication origins

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What does ligase do during replication of DNA?

Joins nicks in DNA strands

Synthesizes the lagging strand

Digests mRNA when it is no longer needed

Makes copies of mRNA from DNA

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Which of the following is not a structural motif in DNA binding proteins?

zinc finger

helix-turn-helix

bZIP

TFIID

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Number of times the two DNA strands are interwined in circular DNA and is known as

linking number

twisting number

helix frequency

none of these

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Which of the following enzyme adds complementary bases during replication?

Helicase

Polymerase

Synthesase

Replicase

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In a cesium chloride gradient, DNA labeled with 15N and centrifuged will form a band

with 14N-containing DNA

below DNA containing 14N

above DNA containing 14N

all of these

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TM refers to the temperature at which

50% of a protein molecules are denatured

50% of a DNA molecule is denatured

All of these

membranes are 50% fluid

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Okazaki fragments occur on the and are bonded together by

tRNA, polymerase

Leading strand, polymerase

mRNA, anticodons

Lagging strand, ligase

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What is the range of melting point temperatures (Tm) for most DNA molecules?

80 to l00°C

70 to 90°C

60 to 80°C

50 to 60°C

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