1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
zaharov [31]
3 years ago
7

1875

Biology
1 answer:
tensa zangetsu [6.8K]3 years ago
6 0

Answer:

In 1869, Friedrich Miescher isolated "nuclein," DNA with associated proteins, from cell nuclei. He was the first to identify DNA as a distinct molecule. Phoebus Levene was an organic chemist in the early 1900's. He is perhaps best known for his incorrect tetranucleotide hypothesis of DNA.

Explanation:

Phoebus Aaron Theodor Levene was born in Sagor in Russia. He grew up in St. Petersburg and studied medicine at the Imperial Military Medical Academy. As a student he worked in the laboratory of his organic chemistry professor where he likely developed an interest in biochemistry.

In 1891, because of growing anti-Semitism in Russia, Levene and his family emigrated to the U.S. They arrived on the symbolic day of July 4. Levene went back to Russia almost immediately to finish his medical degree, but by 1892, he was in New York and practicing medicine on the Lower East Side.

Levene did not give up research. He enrolled as a special student at Columbia University and he split his time between his medical practice and research in the department of physiology. By 1894, he began publishing papers on the chemical structure of sugars. Two years later, Levene received his first appointment as an Associate in the Pathological Institute of the New York State Hospitals. Unfortunately, around this time, Levene contracted tuberculosis and was forced to take time off to recuperate.

Levene used the time between 1896 and 1905 to regain his health and to work with a number of well-known chemists, including Albrecht Kossel and Emil Fischer, the nucleic acid and protein experts of the time. In 1905, Levene was hired by the newly established Rockefeller Institute of Medical Research to head the biochemical laboratory. Levene did most of his nucleic acid work at the Rockefeller and stayed there until his death.

Levene was a cultured man, an art lover and a collector. The walls of his house were lined with either prints and paintings or overflowing bookshelves. Levene was extremely well-read and was fluent in Russian, English, French and German. He also spoke passable Spanish and Italian. His experience, knowledge and his generosity made him a favorite with colleagues and friends. He was also said to be a great teacher, enthusiastic and supportive.

Although mostly remembered now for his incorrect tetranucleotide theory of DNA, Levene published over 700 original papers and articles on the chemical structures of many biochemicals. Levene died in 1940, before the true significance of DNA became clear.

You might be interested in
Who's hair grows the quickest, boys or girls?
professor190 [17]
It's around equal but girls.
4 0
3 years ago
Que es eso díganoslo
aniked [119]

Answer:what

Explanation:

4 0
2 years ago
Which of the following prefixes represents the smallest value?
mafiozo [28]
Centi represents the smallest value
8 0
3 years ago
What is the SI unit for intensity
ad-work [718]

Answer:

Watt

Explanation:

The SI unit of intensity is the watt per square meter.

Plz click the Thanks button

8 0
3 years ago
Describe what corn, dogs, and genes have in common
dangina [55]
Artificial Selection or “ Selective Breeding”. aka the process by which humans use animal breeding and plant breeding to selectively
6 0
2 years ago
Other questions:
  • In the lock and key model of enzyme action the blank fits into the blank of the enzyme
    15·2 answers
  • A group of penguins is standing on an iceberg. half the iceberg falls into the ocean and half of the penguins are killed leaving
    11·1 answer
  • The fossils from the ancestor of camels were found in strata from the Pilocene Epoch (2.5 million years ago) and from the Oligoc
    12·2 answers
  • Members of phylum cnidaria are more closely related to members of phylum porifera than to bilateral animals. True or False
    5·1 answer
  • I NEED HELP. PLEASE SOMEONE HELP ME. What makes an allele dominate, recessive, or codominant?
    6·1 answer
  • One characteristic of living things is their ability to change and adapt over time true or false​
    9·2 answers
  • How does the speckled coat of a young deer help it to survive?
    11·1 answer
  • In the terrestrial food web above, what would be the effect of a farmer introducing a rat poison in to the ecosystem that is tox
    5·1 answer
  • Brainliest and 50 points I will be checking for pagirism so dont plagirise!
    7·2 answers
  • Anyone know how to do this?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!