When the amino acid sequences of insulin isolated from different organisms were determined, differences were noted. For example, alanine was substituted for threonine, serine for glycine, and valine for isoleucine at corresponding positions in the protein. List the single-base changes that could occur in codons of the genetic code to produce these amino acid changes.

Video transcript

Hey everyone. Let's take a look at this question together. How many nucleotides are affected by a point mutation? Well let's recall what a point mutation is. To try to figure out how many nucleotides are affected. So we know that a point mutation is a mutation that only effects a single nuclear type. And so this mutation could be a change or an insertion or even a deletion from a. D. N. A. Or an R. N. A. Sequence. And so the amount of nuclear tides that are affected by that point mutation is answer choice A one. Because a point mutation is that mutation that affects only a single nucleotide and that mutation is either a change an insertion or deletion in that D. N. A. Or RNA sequence. So answer choice A. Is the correct answer. I hope you found this video to be helpful. Thank you and goodbye.