<span>Classical conditioning. Classical conditioning occurs when we link something usually considered "neutral" with a what is called an involuntary response. An example of this would be a student who begins to fear school because of a bully at school. The student associates school with the bully. A well known example of classical conditioning is Pavlov's experiment with his dogs, where the dogs learned to associate the ringing of a bell with eating meat. The dogs only had to hear the bell (not actually see the meat) in order to begin salivating in anticipation of being given the meat to eat.</span>
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Answer:
Early geneticists wondered how only four nucleotides could specify the sequence of 20 amino acids in proteins. Today we know that there is a genetic code in which <u>3</u> nucleotide(s) code(s) for each amino acid.
Explanation:
64 or 43 is the number of possible 3-letter codes which is more than the number of amino acids. Hence, the code can thus be redundant. It has been seen that there is more than one codon that codes for the same amino acid in some cases, .
Hence, Early geneticists wondered how only four nucleotides could specify the sequence of 20 amino acids in proteins. Today we know that there is a genetic code in which <u>3</u> nucleotide(s) code(s) for each amino acid.
<span>metabolic
carbon balance and zonation of sublittoral
macroalgae </span>
