OBJECTIVE LIFE SCIENCE
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A student isolates, purifies, and combines in a test tube a variety of molecules needed for DNA replication. After adding some DNA to the mixture, replication occurs, but each DNA molecule consists of a normal strand paired with numerous segments of DNA a few hundred nucleotides long. What has the student probably left out of the mixture?
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DNA polymerase
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DNA ligase
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Okazaki fragments
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primase
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Explanation:
Detailed explanation-1: -When she adds some DNA to the mixture, replication occurs, but each DNA molecule consists of a normal strand paired with numerous segments of DNA a few hundred nucleotides long. What has she probably left out of the mixture? DNA polymerase.
Detailed explanation-2: -Justification of correct answer. Option (c) is a DNA polymerase. The reverse ( 3’ to 5’ ) exonuclease activity of the DNA polymerase enzyme regulates the proofreading process, allowing them to delete improperly inserted bases from newly produced DNA and replace them with correct bases.
Detailed explanation-3: -Answer and Explanation: The enzyme that is involved in separating the DNA strands during DNA replication is called DNA helicase.
There is 1 question to complete.