C. DNA molecules
Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure.
Protein process is when the protein takes two steps to transcript and translation. Transcript takes the DNA and in codes it to mRNA which heads out of the cell's nucleus and into the cytoplasm
When an organism’s dna mutates, its physical characteristics (or phenotype) can change, or it can impact the way DNA codes the genetic information (genotype).
The Central Dogma states that cellular information is transmitted from DNA to mRNA to proteins
The correct answer is (B) Photosynthesis and diffusion from the air
Dissolved oxygen enters the water from photosynthesis and through air. The The aeration of water can be caused by wind. From the air oxygen diffuse into the water and gets mixed in the it through circulation. The oxygen is also produced as a waste product of photosynthesis from blue-green algae, phytoplankton, etc which is added in water.
