The following studies of science have the following short definitions listed
Biochemistry - the chemistry/chemical processes of living matter
Genetics - the science heredity and genes
Biology- the science of living matter and life cycles
Chemistry- study of matter and energy and how they interact
Molecular Biology- study of biology at the molecular level
All of these studies of sciences are similar but also very different. Biochemistry looks at living matter and focuses on cellular components inside the living matter. Where chemistry looks at some cellular components but does not actually have to be living matter. Genetics and Biochemistry seem very similar when it comes to comparing proteins, amino acids and nucleic acids. However, in genetics you look at how these proteins, nucleic acids and amino acids make up traits and characteristics in living matter. Molecular biology looks deeply into different variations and interactions between various systems in a cell.
As you can see, all of these sciences have a lot of similarities between each other. However, they all either have a broad or narrow scale on what they independently focus on. All of these sciences together would give you your best understanding of how "everything" is interconnected.
