The most accepted theory regarding the make-up of living things is the cell theory.
It was proposed by German scientists Theodor Schwan, Mathias Schleiden and Rudolf Virchow.
It states that;
1. All living organisms are made of cells.
2. The cell is the basic unit of life.
3. Cells arise from pre-existing cells.
in addition the modern version of the cell theory states:
4. Energy flow occurs within cells
5. Heredity information (DNA) is passed from cell to cell.
6. All cells have the same basic chemical composition.
Answer:
i ship ray and emma from the promised neverland. i did ship her and norman but y'know
Explanation:
it's d, they're lysosomes.
Answer: a) substrate and cofactors b) covalent modification
Explanation:
Metabolic pathways involve all the chemical processes takes place in the enviornment or in an organisms.The metabolic pathways are controlled through the catalytic activities of enzymes.
The availability of enzyme is regulated by substrate and cofactors present in enzyme and enzyme activity is commonly regulated via covalent modification.
Enzymes are highly selective in nature and bind to a specific substarte only. The active site in enzyme binds with the substrate to form enzyme substrate complex. Coactors assist the enzyme activity, without cofactor enzyme can not perform its activity.
Hence enzyme availibility is regulated by substrate and cofactors regulates.
Covalent modifications regulates activity of enzyme as it involves addition and removal of chemical group to synthesis required protein. It can change the chemical properties of the site by targeting one or multiple amino acid.
Thus the correct answer is a) substrate and cofactors b) covalent modification