Microbiology
cell biology because cell biology deals with the all organelles in a cell and a nucleus is one of the organelle of the cell
Zoology is branch of Biology that deals with study of animals .
The branch of biology that deals with the study of organisms is called "organismal biology" or "organismal study." This field focuses on the physiology, behavior, ecology, and evolution of individual organisms.
Genetics.
biology in general, to broad a subject
biology is a branch of science that deals w/ the study of life.
phylogeny
Gerontology is the branch of biology that deals with the nature of aging, including the study of the biological, psychological, and social aspects of aging.
Branch of science that deals with study of living things is called Biology .
Botany is the branch of science that deals with the study of plants, including their structure, growth, reproduction, metabolism, and classification.
Cell biology. As in this branch all cell organelles are studied and we know that nucleus is one of the major organelle of the cell. So we study nucleus in this branch.
Taxonomy is a branch of biology which deals with the identification, nomenclature and classification of organism.