This is the 3238th most frequent Korean word.
구조가
"구조가" means "structure" or "construction."
In this sentence, '구조가' functions as the subject marker indicating that the structure of the building is being described as complex.
이 건물의 구조가 매우 복잡해요.
The structure of this building is very complex.
Here, '구조가' indicates the subject of interest, which is the structure of the universe, highlighting its mysterious nature.
우주의 구조가 아직도 미스터리입니다.
The structure of the universe is still a mystery.
In this sentence, '구조가' serves to declare the subject (DNA's structure) and describe its precise and elaborate nature.