Multiple choice Grana are _____. found in the thylakoid lumen found in chloroplasts found in the thylakoid proteome found in thylakoid integral membrane proteins Reveal answer Fill a bubble to check yourself B Correct answer Explanation A granum (plural grana) is a stack of thylakoid discs. Chloroplasts can have from 10 to 100 grana. Grana are connected by stroma thylakoids, also called intergrana thylakoids or lamellae.