Which statement is true? there are a number of chromosomes on a given gene; all of these actively code for proteins. chromosomes contain many genes; not all genes are actively coding. dna contains a number of segments that code for specific proteins; these segments are proteins. the segments of genes found on chromosomes are made of rna, which codes for protein synthesis.

Chromosomes contain many genes; not all genes are actively coding.

Explanation:

All cells in a given organism at a given time in their life contain the same code or genetic information as that first cell from which they originated, but not all genes are functioning in all cells at the same time and to the same degree. From this we can conclude that chromosomes contain many genes; Not all genes are actively coding.

In man, for example, there are genes that are actively coding only at a particular stage of life. Others in a particular organ. And still others only when a disease is underway.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.