If two people have the same mtdna, what can you infer about their biological relationship?

They are related mother to child. mtDNA is DNA contained in the mitochondria, and does not change from mother to child. So, it could be a grandma and her grandchild if she had a daughter, or a mother and her child.

Glucose, also called grape sugar, blood sugar or corn sugar, is among the simplest and one of the primary naturally occurring sugars. produced naturally by plants as the primary photosynthesis product, it is heavily used by living beings as a main energy source and is necessary for cellular respiration. chemically, it is a monosaccharide carbohydrate and serves as a building block for complex sugars like starch.