Question

question 67
the region of a mrna molecule that corresponds to a single amino acid is called
a an operon.
b a gene.
c a chromosome.
d a codon.
e a nucleotide base.
question 68
true or false: the sequence of its amino acids determines the shape of a protein.
a true
b false
question 69
what is a protein?
a a macromolecule that is made from various nucleotides
b a macromolecule that is made from various amino acids
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Explanation:

• Question 67:
• An operon is a cluster of genes with related functions in prokaryotes.
• A gene is a segment of DNA that codes for a functional product.
• A chromosome is a long - DNA molecule with part or all of the genetic material of an organism.
• A nucleotide base is a component of nucleotides (the building blocks of nucleic acids).
• A codon is a triplet of nucleotides in mRNA that corresponds to a single amino acid.
• Question 68:
• The primary structure of a protein (the sequence of amino acids) determines its secondary (e.g., alpha - helices, beta - sheets), tertiary (three - dimensional shape), and in some cases quaternary (assembly of multiple subunits) structures.
• Question 69:
• Nucleotides are the building blocks of nucleic acids (like DNA and RNA).
• Proteins are macromolecules made up of amino acids linked by peptide bonds.

Answer:

• Question 67: D. a codon
• Question 68: A. True
• Question 69: B. a macromolecule that is made from various amino acids