Which of the following occurs as proteins form? a. chains of dna codons and rna anti codons form. b. specific codons pair with specific anti codons. c. dna strands form a backbone of sugar rings and phosphate groups. d. peptides bond to nucleic acid molecules.

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.