DNA Structure and Functions

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Because all DNA polymerases synthesize DNA in the 5-to-3 direction, and the parental strands are antiparallel, DNA replication is accomplished with the use of two mechanisms: continuous and discontinuous replication. Indicate whether the following items relate to (1) continuous replication, (2) discontinuous replication, or (3) both modes of replication.

Indicate whether the following statements are true or false

Gene sequences correspond exactly to the respective protein sequences produced from them. FALSE. Firstly, genes always have intron sequences and secondly, genes often contain nucleotides adjoining the protein-coding sequences that are essential for the control of transcription as well as translation.

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Gene expression is the process of duplicating genes during DNA replication. FALSE. Gene expression is the process of transforming from gene sequence to RNA sequence, to protein sequence.

DNA replication takes place by semi-conservative replication

Each strand of DNA contains all the information needed to create a new double-stranded DNA molecule with the same sequence information. TRUE

Replication of DNA require translation of the coded gene sequences. FALSE

Human DNA has regions of non-coding sequences within genes called introns. TRUE

Which of the following statements is true?

  • The peptide bond forms between two alpha carbons in the backbone.
  • Survival for the fittest is a commonly known phrase relating to Darwin’s theory of natural selection. What is meant by the fittest in this context?

  • Physical superiority
  • Which of the following statements is true about unsaturated fatty acids?

  • unsaturated fatty acids have one or more C=C double bonds
  • Lipids which are liquid at room temperature generally contain a higher proportion of unsaturated fatty acids.

NB: The questions on taxonomy are all answered correctly.

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