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Who is the father of genetic engineering?
Which is the first recombinant plasmid?
The first recombinant DNA was constructed by Stanley Cohen and Herbert Boyer in 1972. They cut the piece of DNA from a plasmid carrying antibiotic resistance gene in the bacterium Salmonella typhimurium and linked it to the plasmid of Escherichia coli.
Which enzyme is known as genetic scissors?
How do we cut DNA?
In the laboratory, restriction enzymes (or restriction endonucleases) are used to cut DNA into smaller fragments. The cuts are always made at specific nucleotide sequences. Different restriction enzymes recognise and cut different DNA sequences.
What is the true for archaebacteria?
(d) The archaebacteria are able to flourish in extreme conditions of environment that are believed to have existed on the primitive earth. ... It is believed that these represent the early forms of life. Hence, archaebacteria are called "oldest,living beings" .
What is true Mammalia?
Mammals are characterized by the presence of mammary gland, placenta, muscular diaphragm, seven cervical vertebrae skin with hair and viviparity except platypus which is the egg laying mammal.
Why bacteria are considered primitive organisms?
Bacteria are called as primitive organisms because they were the first to appear on earth. because its cell has not well defined nucleus.
Are archaebacteria are fossils?
Archaeans are an ancient form of life, possibly the most ancient. Putative fossils of archaean cells in stromatolites have been dated to almost 3.
Which is older archaea or bacteria?
Bacteria are nearly as ancient as archaea. Fossils show that they were widespread about 1.
Did bacteria or archaea come first?
Archaea – at that time only the methanogens were known – were first classified separately from bacteria in 1977 by Carl Woese and George E. Fox based on their ribosomal RNA (rRNA) genes.
What is the most ancient group of bacteria?
What is the first bacteria on Earth?
Cyanobacteria, also known as blue-green algae, started out on Earth quite a while ago. Possible fossil examples have been found in rocks that are around 3500 million years old, in Western Australia.
What was the first living thing on earth?
The earliest life forms we know of were microscopic organisms (microbes) that left signals of their presence in rocks about 3.
What came after dinosaurs?
The good old days. About 60 million years ago, after ocean dinosaurs went extinct, the sea was a much safer place. Marine reptiles no longer dominated, so there was lots of food around, and birds like penguins had room to evolve and grow. Eventually, penguins morphed into tall, waddling predators.
What is the most dangerous animal in the world?
Which animal kills most humans?
What animal kills the most humans in Africa?
What is the deadliest fish in the world?
10 of the World's Most Dangerous Fish
- Candiru. ...
- Great White Shark. ...
- Moray Eel. ...
- Tigerfish. ...
- Piranha. ...
- Stonefish. Stonefish (Synanceia verrucosa). ...
- Atlantic Manta. manta ray moodboard—moodboard/Thinkstock. ...
- Electric Eel. electric eel Toni Angermayer/Photo Researchers.
What is the most venomous snake in the world?
Can one piranha kill you?
Although often described as extremely dangerous in the media, piranhas typically do not represent a serious risk to humans. ... Most piranha attacks on humans only result in minor injuries, typically to the feet or hands, but they are occasionally more serious and very rarely can be fatal.
Can a piranha bite your finger off?
They will snap a finger off a hand incautiously trailed in the water; they mutilate swimmers—in every river town in Paraguay there are men who have been thus mutilated; they will rend and devour alive any wounded man or beast; for blood in the water excites them to madness.
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