Organelles are the substructures (such as mitochondria and chloroplasts) inside cells that perform particular functions. They are therefore smaller than cells.
Q. What DNA goes together?
Attached to each sugar is one of four bases–adenine (A), cytosine (C), guanine (G), or thymine (T). The two strands are held together by hydrogen bonds between the bases, with adenine forming a base pair with thymine, and cytosine forming a base pair with guanine.
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Q. What are the 3 units of DNA?
DNA is made of chemical building blocks called nucleotides. These building blocks are made of three parts: a phosphate group, a sugar group and one of four types of nitrogen bases. To form a strand of DNA, nucleotides are linked into chains, with the phosphate and sugar groups alternating.
Q. What is the oldest DNA ever found?
Scientists say they have discovered the oldest DNA on record. It was found in the teeth of mammoths that lived in northeastern Siberia up to 1.2 million years ago. A mammoth was a kind of early elephant that lived during the Ice Age.
Q. Do we have caveman DNA?
The percentage of Neanderthal DNA in modern humans is zero or close to zero in people from African populations, and is about 1 to 2 percent in people of European or Asian background.
Q. What ethnicity is the oldest?
An unprecedented DNA study has found evidence of a single human migration out of Africa and confirmed that Aboriginal Australians are the world’s oldest civilization. The newly published paper is the first extensive DNA study of Aboriginal Australians, according to the University of Cambridge.
Q. What is the largest ethnic race in the world?
The world’s largest ethnic group is Han Chinese, with Mandarin being the world’s most spoken language in terms of native speakers. The world’s population is predominantly urban and suburban, and there has been significant migration toward cities and urban centres.
