Which statement is true of all proteins?
Responses
They carry oxygen in human blood.
They carry oxygen in human blood.
Their structure is related to their function.
Their structure is related to their function.
They are created by mutations in DNA
They are created by mutations in DNA
Their main function is to cause mutations.
Their structure is related to their function.
What determines a trait of an organism?
Responses
the number of copies of the gene
the number of copies of the gene
the number of dominant alleles
the number of dominant alleles
the combination of its alleles
the combination of its alleles
its phenotype
the combination of its alleles
The statement that is true of all proteins is: "Their structure is related to their function."
To arrive at this answer, we can eliminate the other options:
- "They carry oxygen in human blood": This statement is only true for a specific group of proteins called hemoglobin and myoglobin, which are responsible for carrying oxygen in human blood. Not all proteins have this function.
- "They are created by mutations in DNA": While mutations in DNA can lead to changes in proteins, not all proteins are created through mutations. Proteins are usually synthesized based on the instructions encoded in the DNA sequence, but mutations can introduce variations or changes in protein structure and function.
- "Their main function is to cause mutations": Proteins do not primarily function to cause mutations. Proteins have diverse functions in biological processes, including enzymatic reactions, cell signaling, structural support, transportation, and regulation.
By process of elimination, we can conclude that the statement "Their structure is related to their function" applies to all proteins. It means that the specific 3D shape and arrangement of amino acids in a protein determine its function in performing various biological tasks.