The packing of chromatin can be regulated by either the acetylation or deacetylation of DNA. A. True

B. False

B. False

Explanation:

The attraction between DNA and histones occurs because the histones are positively charged and the DNA is negatively charged.

B is your answer

Explanation:

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.