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DNA Structure and Replication

DNA Structure and Replication
What is the IUPAC code for an A, C, T ambiguity in a nucleic acid sequence?

H
B
None of these
S

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DNA Structure and Replication
Messelsen and Stahl model of replication was called

dispersive replication
Cri du Chat
semi-conservative replication
conservative replication

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DNA Structure and Replication
What does ligase do during replication of DNA?

Digests mRNA when it is no longer needed
Joins nicks in DNA strands
Synthesizes the lagging strand
Makes copies of mRNA from DNA

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DNA Structure and Replication
The chromosomal DNA complexes with

two types of histone as H1 and H4
five types of histone as H1, H2A, H2B, H3 and H4
four types of histone as H1, H2A, H3 and H4
three types of histone as H1, H2A and H4

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DNA Structure and Replication
The 5' and 3' numbers are related to the

the number of phosphates
length of the DNA strand
carbon number in sugar
the base pair rule

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DNA Structure and Replication
Without telomerase, what would happen to the ends of chromosomes after each round of replication?

Chromosomes would get longer
None of these
Nothing would happen
Chromosomes would become progressively shorter

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