Question

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 29
rna polymerase functions to
a translate mrna into proteins
b assembles a mrna polymer
c assembles a dna polymer
d build ribosomes
question 30
which rna is the code for a protein or is translated into a protein?
a rrna

Explanation:

For the first question, a codon is a sequence of three nucleotides in mRNA that corresponds to a single amino - acid. An operon is a group of genes under one regulatory sequence, a gene is a segment of DNA that codes for a product, a chromosome is a structure containing DNA and proteins, and a nucleotide base is a component of nucleotides.
For the second question, RNA polymerase synthesizes mRNA from a DNA template during transcription. It assembles a mRNA polymer. Translating mRNA into proteins is done by ribosomes, and DNA polymer is assembled by DNA polymerase. Building ribosomes involves rRNA and proteins.
For the third question, mRNA (messenger RNA) is the RNA that contains the code for a protein and is translated into a protein. rRNA (ribosomal RNA) is a component of ribosomes.

Answer:

Question 1: D. a codon
Question 2: B. assembles a mRNA polymer
Question 3: mRNA (not given as an option, but if we assume the closest correct option among the given ones is not present, the correct concept is mRNA)