Question

section 6.3, continued
transcription and translation
practice 4
answer the following questions about transcription and translation. darken the circle that corresponds to your answer choice.

1. what is the correct sequence of protein synthesis in a cell?

ⓐ dna → mrna → protein → amino acid
ⓑ dna → protein → amino acid → mrna
ⓒ dna → mrna → amino acid → protein
ⓓ dna → amino acid → mrna → protein

1. what is the role of transcription in protein synthesis?

ⓐ it makes an exact copy of the dna.
ⓑ it copies the instructions in dna onto a strand of mrna.
ⓒ it copies the instructions on ribosomes into dna.
ⓓ it translates the instructions in trna into amino acids.

1. which molecule carries the genetic code from the nucleus of a cell to a ribosome in the cytoplasm?

ⓐ messenger rna
ⓑ ribosomal rna
ⓒ transfer rna
ⓓ dna

1. which of the following statements best describes a codon?

ⓐ a type of rna that copies instructions from a portion of dna
ⓑ a sequence of three bases that codes for a protein
ⓒ a portion of dna that codes for a specific protein
ⓓ a sequence of three bases that codes for an amino acid

1. if a student constructs a model for the process of translation, the final product will be represented by which of the following?

Explanation:

1. Protein synthesis first uses DNA to make mRNA (transcription), then mRNA is used to build a chain of amino acids that forms a protein (translation).
2. Transcription is the process where genetic information from DNA is copied into a complementary mRNA strand.
3. Messenger RNA (mRNA) carries the genetic code from the cell's nucleus to ribosomes in the cytoplasm for translation.
4. A codon is a 3-base sequence on mRNA that corresponds to a specific amino acid.
5. The final product of translation is a protein (polypeptide chain made of amino acids), though the full question cut-off confirms the product is a protein, matching the end of the synthesis pathway.

Answer:

1. C. DNA → mRNA → amino acid → protein
2. B. It copies the instructions in DNA onto a strand of mRNA.
3. A. messenger RNA
4. D. a sequence of three bases that codes for an amino acid
5. (Completed based on context: a protein)