instruction:
In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.
question:
Question: When does exchange of dna segments happen between non-sister chromatids of homologous chromosomes? Answer: during crossing-over
answer:
Exchange of dna segments happens between non-sister chromatids of homologous chromosomes during crossing-over.


question:
Question: Boron only occurs naturally in compounds with what element? Answer: oxygen
answer:
Boron only occurs naturally in compounds with oxygen element.


question:
Question: Protein chains containing 10 or fewer amino acids are usually referred to as what? Answer: peptides
answer:

Protein chains containing 10 or fewer amino acids are usually referred to as peptides.