Optic components: cornea, lens, vitreous body, and the aqueous body b. Not an optic component of the eye: retina 87. Glaucoma is a state of elevated pressure within the eye that occurs when ___ is obstructed so that the _____ is not reabsorbed as fast as it is secreted. a. Occurs when the scleral venous sinus is obstructed so the aqueous humor is not reabsorbed as fast as it is secreted.
Substitution mutation. Definition. A type of point mutation in which a single nucleotide is substituted with (or exchanged for) a different nucleotide that may result in an altered sequence of amino acid during translation, which may render the newly synthesized protein ineffective. Supplement.
This image shows an example of missense mutation. One of the nucleotides (adenine) is replaced by another nucleotide (cytosine) in the DNA sequence. This results in an incorrect amino acid (proline) being incorporated into the protein sequence.In genetics, a missense mutation (a type of nonsynonymous substitution) is a point mutation in which a single nucleotide change results in a codon that codes for a different amino acid.hen an amino acid may be encoded by more than one codon (so-called degenerate coding) a mutation in a codon may not produce any change in translation; this would be a silent mutation (a type of synonymous substitution, which is not always silent) and not a missense mutation.