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The genetic code is a sequence of nucleotides in DNA and RNA that dictates the order of amino acids in proteins. It is characterized as being universal, specific, non-overlapping, and redundant. Which of the following statements is accurate?

1. The nucleosome core consists of four histone proteins: H2A, H2B, H3, and H4.
2. A nucleotide, the building block of DNA, is composed of a nitrogenous base (purines and pyrimidines), a pentose sugar, and a phosphate group.
3. The initial step of translation includes the activation of amino acids using ATP, followed by their attachment to specific tRNA molecules, a process referred to as tRNA charging or aminoacylation.
4. Alterations in tRNA genes can decrease the tRNA's efficiency in incorporating amino acids into proteins, leading to slower protein synthesis. Mutations in mitochondrial tRNAs can disrupt energy production or blood sugar regulation.

Correct answer: The initial step of translation includes the activation of amino acids using ATP, followed by their attachment to specific tRNA molecules, a process referred to as tRNA charging or aminoacylation.

Solution

Option C is correct because it accurately describes the first step of translation, where amino acids are activated and linked to their specific tRNA molecules, a process known as aminoacylation or charging of tRNA.

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