What happens when a ribosome encounters a stop codon (UAA, UAG, or UGA) during translation?

It releases the completed polypeptide chain.

How does a tRNA molecule ensure that the correct amino acid is added to the growing protein chain during translation?

Its anticodon pairs with the complementary mRNA codon.

How does the single-stranded structure of RNA contribute to its role as a temporary copy of genetic information?

It makes it suitable for temporary use and allows it to be easily transcribed and degraded.

The double-stranded structure of DNA is important because:

It contributes to its stability, making it suitable for long-term storage of genetic information.

The presence of Uracil in RNA (instead of Thymine in DNA) is important because:

It allows cellular machinery to easily differentiate between RNA and DNA.

The genetic code is described as "redundant" or "degenerate" because:

Some amino acids are coded by more than one codon.

How might the redundancy of the genetic code be beneficial for an organism?

It provides a buffer against the effects of some point mutations, reducing the likelihood of a protein change.

Explain why different DNA template sequences could potentially code for the same polypeptide chain.

Because the genetic code is degenerate, meaning different mRNA codons can code for the same amino acid, and these codons are transcribed from different DNA sequences.

If a mutation occurred in a gene's promoter region such that RNA polymerase could no longer bind effectively, what would be the likely consequence for protein synthesis of that gene?

Transcription would be significantly impaired or stopped, preventing mRNA synthesis and subsequent protein synthesis.

Why is the accurate removal of introns from pre-mRNA before translation important in eukaryotic cells?

Failure to remove introns can cause a frameshift in the reading frame during translation, leading to an incorrect amino acid sequence and likely a non-functional protein.

What would likely happen during translation if an intron was not properly removed from a eukaryotic pre-mRNA molecule and was translated?

The ribosome's reading frame would be disrupted after the intron, likely leading to a non-functional or truncated protein.

What effect could a point mutation changing an mRNA codon from UAU to UAA have on the resulting protein?

Translation would stop prematurely at this new stop codon, likely resulting in a shorter, truncated protein.

Describe the essential, coordinated roles of mRNA, tRNA, and ribosomes (containing rRNA) during the process of translation.

mRNA carries the genetic instructions from DNA; tRNA molecules bring specific amino acids to the ribosome based on mRNA codons; ribosomes are the cellular machinery that reads the mRNA and catalyzes the formation of peptide bonds between amino acids.

Why is it critical that the ribosome begins translation at the specific AUG start codon and maintains the correct reading frame?

To ensure that the mRNA sequence is read in the correct groups of three nucleotides (codons), leading to the proper sequence of amino acids.

Given the DNA template strand sequence 3'-TAC CGA AAG GGC-5', what is the correct mRNA sequence (labeled 5' to 3') and the resulting amino acid sequence after translation?

mRNA: 5'-AUG GCU UUC CCG-3'; Amino Acids: Met-Ala-Phe-Pro

Using the rectangular codon chart, once you have located the correct row (first nucleotide) and column (second nucleotide), where do you find the specific amino acid coded by the codon, based on the third nucleotide?

Within the box at that intersection, next to the third nucleotide of the codon.

A tRNA molecule has the anticodon sequence 3'-UAC-5'. What mRNA codon will this tRNA pair with, and which amino acid is typically associated with this mRNA codon as the starting point of translation?

mRNA codon 5'-AUG-3', Methionine (Met)

A tRNA molecule has the anticodon 3'-CCG-5' (written 3' to 5'). What mRNA codon will it pair with, and which amino acid will be added to the protein chain according to the codon charts?

mRNA codon 5'-GGC-3', Glycine (Gly)

The genetic code is NOT described as "ambiguous" based on the sources because:

Each specific codon codes for only one specific amino acid or one specific stop signal.

Protein Synthesis Practice Flashcard: Transcription and Translation Flashcards

Student preview

50 questions

Show all answers

1.

FLASHCARD QUESTION

Front

Where does the process of transcription primarily occur in a eukaryotic cell?

Back

Nucleus

2.

FLASHCARD QUESTION

Front

What is the main purpose of transcription?

Back

To copy genetic information from DNA into mRNA.

3.

FLASHCARD QUESTION

Front

The enzyme responsible for synthesizing mRNA during transcription is:

Back

RNA polymerase

4.

FLASHCARD QUESTION

Front

In a eukaryotic cell, where does translation take place?

Back

Ribosomes

5.

FLASHCARD QUESTION

Front

What molecule carries the genetic instructions from DNA to the ribosome for protein synthesis?

Back

mRNA

6.

FLASHCARD QUESTION

Front

Genetic information carried by mRNA is read in sequence of three nucleotides called:

Back

Codons

7.

FLASHCARD QUESTION

Front

What is the function of the start codon (AUG) in translation?

Back

It signals where the translation process should begin.

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