Answer:
Early geneticists wondered how only four nucleotides can specify the sequence of 20 amino acids in proteins. They hypothesized that there must be a code that linked the nucleotide sequence in a gene to the amino acid sequence in a protein. Each nucleotide code is called a codon. Today we know that there is a genetic code in which __________nucleotide(s) code(s) for each amino acid.
3
4
1
2
Explanation:
3 is the answer. 43 or 64 is the number of possible 3-letter codes that can be formed.
more than one codon can codes for the same amino acid
The lac operon is an operon required for the transport and metabolism of
lactose in Escherichia coli and many other entric bacteria. It includes
the promoter, regulatory and the operator.
Answer: C. repressor gene
Answer: I believe the answer is "A," CAT - CGA - TCC mutates to CAC - TCG - ATC - C. Please don't hate me if I am wrong though. I hope this helps you, have a great day and God bless you! TvT
Answers;
Initiation of transcription;
Proteins called transcription factors are involved in the initiation stage of transcription
Explanation;
Transcription factors are proteins that help turn specific genes "on" or "off" by binding to nearby DNA.
Transcription factors that are activators boost a gene's transcription while the repressors decrease transcription.
These factors allow cells to perform logic operations and combine different sources of information to "decide" whether to express a gene
Some birds prioritize blending in with their environment while other species of birds have bright and effervescent feathers in order to attract a mate.
Hope this helps!