The structure is a phospholipid bilayer. There are many phospholipids which contain a water loving phosphate end and a water hating lipid (fatty) end. The phosphate ends all point out words while the fatty ends are inside.
The purpose is protection of the cell as well as allowing certain molecules to enter and exit the cell
Answer:
In some primordial soup of molecules, a self-replicating RNA formed.
Explanation:
?
Answer:
Positively charged ions
Explanation:
Histones are a group of proteins with a N-terminal end of an amino acid, that binds to the DNA in the nucleus helping it to condense into Chromatin. DNA wraps around a core of proteins to initially form the NUCLEOSO ME structure, which is the basic subunit of Chromatin. Each nucleosome is made up of DNA coiled around two copies (2) of proteins- H2A, H2B, H3 and H4, to form a set of eight proteins called histone octamer.
Due to the phosphate group (PO4-) embedded in the DNA molecule, they assume a negative charge. The positively charged ions of the N(C) terminal end of histones which arise from the amino acid group they contain allows it to bind tightly to negatively charged DNA i.e. the more positively and negatively charged the histone and DNA are respectively, the tighter the binding.
Due to this property, the proteins that binds to DNA in E.coli, should possess a positive charge in similarity to histones in eukaryotes.
The tongue has a lot of taste buds on it. These taste buds contain the sensory receptors that respond to the food particles. The sensory receptors emit an electrical signal that is carried by the sensory neurons present in the tongue to the brain. The brain has a lot of inter-neurons that help in processing the signal and form bridge between the sensory and motor neurons. The brain analyses and decodes the taste from the electrical signal and relays an output through the motor neurons to the muscles present in the tongue and the cheeks to spit the sour milk out.
