Angola 12th Grade Biology National Exam Practice Questions - Angola 12th Grade National Examination - Biology (Exame Nacional Da 12.a Classe Biologia) Exam

All living organisms are composed of one or more cells, and all cells arise from pre-existing cells. Cells can spontaneously generate from non-living organic matter under anaerobic conditions. All cells possess a membrane-bound nucleus and compartmentalized membrane organelles. Viruses represent the most primitive independent cellular life forms capable of autonomous reproduction.