AP Protein Synthesis

In eukaryotic cells, the transcription of a pre-mRNA is followed by processing. The _____ then moves to the cytoplasm, where ribosomes construct a polypeptide based on the codons in the RNA. The polypeptide is then modified, if necessary.

• mRNA

• tRNA

• rRNA

• DNA

The bonds that hold tRNA molecules in the correct three-dimensional shape are __________.

• hydrogen bonds

• ionic bonds

• covalent bonds

• none of these

The region of DNA to which RNA polymerase attaches and initiates transcription is the promoter, which typically extends several dozen nucleotides "upstream" from the transcription start point.

• true

• false

At one point, as a cell carried out its day-to-day activities, the nucleotides TGA were paired with the nucleotides ACU. This pairing occurred __________.

• during transcription

• in a double-stranded DNA molecule

• during translation

• during replication

There are six codons that code for the amino acid leucine. This is why the code is said to be ____.

• redundant

• incomplete

• antiparallel

• directional

The codons AAA, CCC, GGG, and UUU specify the amino acids lysine, proline, glycine, and phenylalanine, respectively. What peptide sequence would be encoded by the sequence 5'-CCCAAATTTGGG-3', if present in the coding strand of the DNA?

• phe-gly-pro-lys

• gly-phe-lys-pro

• gly-phe-pro-lys

• pro-lys-phe-gly

Tags

NGSS.HS-LS1-1

What tRNA codon would be made from the mRNA triplet UAG?

• AUC

• UAG

• TAC

• ATC

The mRNA base triplets are called codons, each of which codes for the incorporation of polypeptide bonds.

• true

• false

Although slight variations do exist, the genetic code is universal. Nearly all organisms use the same genetic code to translate mRNA to protein.

• true

• false

Exons from the same gene could be spliced in different ways to make different mRNAs.

• true

• false