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Eddi Din [679]
3 years ago
10

PLZZZZZ HURRY!!!!!Scientists estimate that the Earth formed some 4.6 billion years ago with the first forms of life appearing ar

ound 3.5 billion years ago. These first forms of life were simple prokaryotes. Later, the first photosynthetic organisms resulted in more _____________ in the atmosphere. This allowed for more higher level organisms to appear on Earth.
A) carbon
B) nitrogen
C) oxygen
D) sulfur
Biology
1 answer:
FinnZ [79.3K]3 years ago
3 0
I have no idea, i speak english how about u

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It reduces the diameter of an artery

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A purple flower with an unkown genotype is crossed with a white flower. Determine the genotype of the purple flower if purple P
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When scientists were attempting to determine the structure of the genetic code, Crick and coworkers found that when three base a
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Answer:

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Explanation:

Complete question

When scientists were attempting to determine the structure of the genetic code, Crick and coworkers found that when three base additions or three base deletions occurred in a single gene, the wild-type phenotype was sometimes restored. These data supported the hypothesis that ________.

A) the code is triplet

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Solution

The team of Francis Crick was the first one to determine the length of the codon in 1961 by using a T4 bacteriophage. Through an assay, they devised the properties of genetic code and introduced frame shift mutation. So during the initial stage of experiment, only one single frame shift was introduced with in the viral protein of E. coli bacteria thereby making the protein nonfunctional. They then introduced an additional frame shift to restore the protein structure so that its function could be restored. This experiment was successful and concluded with a finding that genetic code is based on multiple of three bases

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