ANT 230 Chapter Notes - Chapter 3.1: Nuclear Membrane, Ribosomal Rna, Organelle
17 Sep 2019
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~ chapter three: the biological basis of life ~ It also contains several kinds of substructures called organelles, one of which is the nucleus which is surrounded by a thin nuclear membrane: nucleus: a structure (organelle) found in all eukaryotic cells. Dna that, during cell division, is organized into chromosomes. Inside the nucleus are two kinds of molecules that contain the genetic information that controls the cell"s functions: molecules: structures made up of two or more atoms. Molecules can combine with other molecules to form more complex structures: these two molecules are the nucleic acids dna (deoxyribonucleic acid) and rna (ribonucleic acid), dna: the double-stranded molecule that contains the genetic code. Dna is a main component of chromosomes: rna: a single-stranded molecule similar in structure to dna. Protein synthesis is directed by dna: two of these organelles, ribosomes and mitochondria, require further mention. proteins, ribosomes: structures composed of a form of rna called ribosomal rna (rrna) and protein.
