Each histone octamer is composed of two copies each of the histone proteins H2A, H2B, H3, and H4.nder the microscope in its extended form, chromatin looks like beads on a string. The beads are called nucleosomes. Each nucleosome is made of DNA wrapped around eight histone proteins that function like a spool and are called a histone octamer.
Many people when they get a cockatiel want to know How Long Does A Cockatiel Live ?. The average lifespan of a cockatiel is around 12 years to 15 years. However, if you look after your bird well and ensure that it eats healthily, you can extend the lifespan of your cockatiel to even 20 years if not more. Cockatiels are quite intelligent and can be taught to whistle, imitate sounds and even speak.
Best Answer: There really is no such thing as a parrot --there are many types of parrots. A cockatoo type of parrot may live to be over 80. A cockatiel type of parrot may only live to be 15 or 20 years old. Macaws live to be 50 years old or more.I have a rainbow lorikeet who is around 20 years old and I heard of a red lory who was 34, but the average lifespan of a lory/lorikeet seems to be in the mid teens.So the answer depends on what TYPE of parrot you are asking about...and you didn't specify.est Answer: There really is no such thing as a parrot --there are many types of parrots. A cockatoo type of parrot may live to be over 80. A cockatiel type of parrot may only live to be 15 or 20 years old. Macaws live to be 50 years old or more.