Question

9 multiple choice 1 point if a strand of dna of sequence 5 aatagcgcggtattc 3 is replicated, which of the following accurately represents the newly synthesized dna strand? 3 ccactgtgttacaag 5 5 ttatcgcgccataag 3 5 ccactgtgttacaag 3 3 ttatcgcgccataag 5 10 multiple choice 1 point what does it mean when we say the genetic code is degenerate? it is full of mutations. it behaves badly, and acts as a parasitic entity it has been impacted by the curse a given amino acid can be coded by more than one nucleotide codon triplet 11 multiple choice 1 point what enzyme is responsible for adding nucleotides to a growing dna chain during replication? exonuclease rna primase dna polymerase rna polymerase 12 multiple choice 1 point which of the following is not true of prokaryotes? transcription and translation occur almost simultaneously gene expression is not regulated gene expression is mainly regulated at the transcriptional level.

Explanation:

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DNA replication follows base - pairing rules (A - T, G - C) and the new strand is antiparallel. The original strand is \(5'\text{-AATAGCGCGGTATTC - }3'\). The complementary bases are: A pairs with T, T with A, G with C, C with G. And the new strand is in the \(3'\) to \(5'\) direction relative to the original \(5'\) to \(3'\) strand.
For the original \(5'\text{-AATAGCGCGGTATTC - }3'\):

• The first base \(A\) (in \(5'\) end of original) pairs with \(T\) (in \(3'\) end of new strand)
• The second \(A\) pairs with \(T\)
• \(T\) pairs with \(A\)
• \(A\) pairs with \(T\)
• \(G\) pairs with \(C\)
• \(C\) pairs with \(G\)
• \(G\) pairs with \(C\)
• \(G\) pairs with \(C\)
• \(T\) pairs with \(A\)
• \(A\) pairs with \(T\)
• \(T\) pairs with \(A\)
• \(C\) pairs with \(G\)

The new strand is \(3'\text{-TTATCGCGCCATAAG - }5'\)

The genetic code is degenerate. This means that more than one codon (a triplet of nucleotides) can code for a single amino acid. For example, the amino acid leucine is coded by \(UUA\), \(UUG\), \(CUU\), \(CUC\), \(CUA\), \(CUG\) codons. Mutations are changes in the DNA sequence. The other options about behaving badly or being impacted by a “Curse” are not scientific explanations related to the degeneracy of the genetic code.

• Exonuclease: Removes nucleotides from the end of a nucleic acid chain (either DNA or RNA), not involved in adding nucleotides during DNA replication
• RNA primase: Synthesizes short RNA primers, which are later replaced. It does not add DNA nucleotides to the growing DNA chain
• DNA polymerase: Adds deoxyribonucleotides to the \(3'\) - OH end of a growing DNA strand during replication
• RNA polymerase: Involved in transcription (synthesis of RNA from a DNA template), not in DNA replication for adding DNA nucleotides

Answer:

D. \(3'\text{-TTATCGCGCCATAAG - }5'\)

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