Francis crick hypothesized that the genetic code must require 3 nucleotides in the mrna to specify each amino acid based on a simple calculation. what was the logic behind this calculation?

The answer is - Based on the number of known amino acids and the number of known nucleotide bases

Explanation:

According to Francis Crick's calculation, three (3) nucleotides encode an amino acid. Proteins are built from a basic set of 20 amino acids, however there are only four (4) bases. Calculations therfore show that to encode at least twenty (20) amino acids a minimum of three (3) bases is required. Genetic experiments have shown that an amino acid is in fact encoded by a group of three (3) bases or codon.

The organisms would accurately be described by Facultative halophiles, Mesophiles, Psychrophiles.

Explanation:

A facultative halophile can be described as an organism that manages to live in increased amount of salt conditions. As the Lake of Ozarks contains water contaminated from drainage and mining it is most likely to have excess amounts of salt in it.

The fecal coliforms are mesophiles because they blossom in a moderate temperature.

The fecal coliforms can also be classified as psychrophiles as they can survive at a temperature of 10 degrees Celsius.