The model is called a double helix because two long strands twist around each other like a twisted ladder. The rails of the ladder are made of alternating sugar and phosphate molecules. The steps of the ladder are made of two bases joined together with either two or three weak hydrogen bonds.
Cells with a relatively simple cell morphology that do not have a true membrane-delimited nucleus are called Prokaryotes.
What are Prokaryotes?
Any organism without internal membranes is referred to as a prokaryote, usually written procaryote. These organisms lack a defined nucleus and other organelles. One of the most well-known prokaryotic species is bacteria. Prokaryotes differ from eukaryotes by not having internal membranes. The principal osmotic barrier of prokaryotic cells is the membrane, which is composed of phospholipids. Ribosomes, which are responsible for protein synthesis, and a double-stranded circular DNA chromosome are both found in the cytoplasm. The circular DNA units known as plasmids, which are found in many prokaryotes, have extra disposable cell activities such encoding proteins that render antibiotics inactive. Prokaryotes with flagella exist. The flagella present on some eukaryotes differ from prokaryotic flagella in terms of appearance and motion.
The cell wall and cytoskeletal components work together to preserve the morphology in the majority of prokaryotic cells. The majority of prokaryotes and certain eukaryotes have a structure called the cell wall that surrounds the cell membrane and shields it from osmotic pressure changes.
Bacteria are prokaryotic cells, i.e., they do not have a membrane-delimited nucleus. Eukaryotes have cells with a delimited nucleus.
Thus these types of cells are called prokaryotes.
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Proteins are large biomolecules that are made up of long chains of building block molecules called amino acids. Each amino acid folds to form a protein with a specific cellular function. Nucleic acid is basically DNA & RNA. DNA is the genetic information that contains all the information one needs to live. RNA stands for ribonucleic acid and has a variety of roles. When comparing them, they actually don't look at all similar when looking at the large molecules or the 'building blocks'. But, they're both made up of mostly carbon, nitrogen, hydrogen and oxygen. The elements mentioned are assembled in different ways for both Proteins & Nucleic acid. The major similarity between them is that with the protein production DNA and RNA contains all the information that a cell uses to make protein.
Natural selection is species survival and reproduction due to differences in some traits that give them an advantage over others
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