Answer:
The correct answers are statements 2nd, 4th, 5th and 6th.
Explanation:
The X-ray experiments performed by Rosalind Franklin and the experiments performed by Watson and Crick resulted in the discoveries of the DNA model. In the 1950s, the X-ray diffraction technique was used by Franklin to know more about the composition of DNA. With the assistance of the experiment done by Franklin, Watson and Crick deduced the model of the DNA helix.
The prime contribution in finding the molecular composition of DNA was done by Watson and Crick and was helped by the contributions done by Chargaff, Hershey and Chase, Linus Pauling, Franklin and Wilkins, and others.
Based on the X-ray experiment conducted by Franklin, it came to know that DNA produces a right-handed helical composition with two polynucleotide chains enveloped around a central axis.
Based on the discoveries made by Chargaff, a purine base comprises hydrogen bonds, which pairs with a pyrimidine base situated on the DNA strand present on the contrary. It came to know that A forms pairing with T and C forms pairing with G.
Alexander Todd an organic chemist discovered that the sugar-phosphate backbones of every DNA helix move antiparallel to each other.
Based on the X-ray experiment performed by Franklin, it came to know that 2 nm is the diameter of the DNA double helix, and each purine-pyrimidine base-pairing covers an equal distance between the two chains.
Answer:
Transcription is the synthesis of RNA from the DNA. It is further divided into three steps:
Initiation: In this step at first, there is binding of RNA polymerase to the group of transcription factors, it binds at the promoter. It is followed by unwinding of DNA double helix, and then the synthesis of RNA starts.
Elongation: The RNA polymerase extends across the DNA template, it adds the base pairs in 5' to 3' direction. In the same step proofreading of RNA is done to eliminate the errors in synthesis.
Termination: In this step RNA polymerase detaches, at certain stop signals, adding of further base pairs is also terminated by RNA polymerase. The newly synthesized transcript of RNA is released.
Moss and grasses
category of plants will probably form the climax community
Explanation:
Krakatoa is a small volcanic island which is in Indonesia. It is about 100 miles west of Jakarta. It is found in the Sunda Strait. It is between the island of java and Sumatra.
Krakatoa was made up of three peak which is known as Perboewatan, Rakata and Danan. Around 36000 people were killed in 1983 due to volcanic eruption. It is known most devastating volcanic history eruption in human history
Movement is not a characteristic of life as not all living things move. Sponges are one organism that is living and does not move. Plants, for that matter, are living and do not move. On the other hand, <em>all</em> living creatures have cells, maintain homeostasis, and obtain and use energy.