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by BlastRoom
Read DNA and mRNA sequences against a codon chart to work out amino acids, start and stop signals, and the effect of a changed base.
#biology
40 questions
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Use the codon extract shown. Which amino acid does the messenger RNA codon 5'-CAU-3' specify?
A ribosome reaches the codon 5'-GGA-3' in an mRNA strand. According to the extract shown, which amino acid is added to the chain there?
The tRNA that binds the mRNA codon 5'-ACC-3' is carrying which amino acid? Read the extract shown.
The second codon of an mRNA reads 5'-UUC-3'. Using the extract shown, which amino acid is added second to the growing polypeptide?
Read the codon extract. Which amino acid does the mRNA codon 5'-AAG-3' code for?
An mRNA codon reads 5'-GUG-3'. Which amino acid does the extract shown assign to it?
Which amino acid does a tRNA deliver when it pairs with the mRNA codon 5'-UGC-3'? Use the extract shown.
Use the extract shown. The codon 5'-CCG-3' appears in an mRNA. Which amino acid does it place in the chain?
Two codons in the same mRNA read 5'-UCA-3' and 5'-AGC-3'. Using the extract shown, which amino acid do both of them add to the polypeptide?
The codon 5'-GAU-3' sits in the middle of an mRNA. Using the extract shown, which amino acid goes into the polypeptide at that point?
A DNA template strand reads 3'-TACGGACCA-5'. Using the extract shown, which amino acid sequence does it code for?
The template strand of a gene reads 3'-TACTTGGCA-5'. Using the extract shown, which polypeptide does it code for?
The CODING strand of a gene, not the template strand, reads 5'-ATGTGGAAA-3'. Using the extract shown, which amino acid sequence is built from the mRNA copied from this gene?
A DNA template strand reads 3'-TACCCGATT-5'. Using the extract shown, what does this stretch of DNA code for?
A gene's template strand reads 3'-TACGTTACG-5'. Using the extract shown, which polypeptide does the cell build from it?
On the template strand of a gene the first triplet read is 3'-TAC-5'. Using the extract shown, which amino acid does that triplet put at the front of the polypeptide?
A DNA template strand reads 3'-ACCGTAGGT-5'. Using the extract shown, which amino acid sequence does the mRNA made from it carry?
A DNA template strand is 3'-TACAAATGA-5'. According to the extract shown, what is the THIRD amino acid in the chain it codes for?
Using the extract shown, which DNA template sequence codes for the amino acid pair methionine - alanine?
A DNA template strand reads 3'-TACGCTAAC-5'. Which mRNA molecule is transcribed from it?
Read the codon extract shown. Which of these codons would NOT bring a tRNA and its amino acid to the ribosome?
An mRNA reads 5'-AUGCAUUGGUGA-3'. Using the extract shown, which codon in it releases the finished polypeptide from the ribosome?
Translation always begins at one particular codon. Using the extract shown, which codon is it, and which amino acid does it also add to the chain?
A student says the codon UGG ends translation because it looks so much like UGA. Using the extract shown, what does UGG actually do?
Which list gives the three codons that signal the end of translation?
A ribosome reaches a stop codon in an mRNA. What happens at that codon?
A substitution changes the mRNA codon CUU to CUA. Using the extract shown, which amino acid is added at that position now?
A point mutation changes an mRNA codon from GAA to GUA. Using the extract shown, which amino acid does the ribosome now place in the growing chain?
One base changes and the mRNA codon UGU becomes UGA. Using the extract shown, what does this do to the polypeptide?
In the mRNA 5'-AUGAAAGGU-3' the last base of the second codon changes from A to G. Using the extract shown, which amino acid does the second codon add after the change?
A DNA template triplet changes from 3'-ACA-5' to 3'-ACC-5'. Using the extract shown, which amino acid is now added where cysteine used to go?
An mRNA reads 5'-AUGUUUGGA-3'. An extra G is inserted right after the start codon, giving 5'-AUGGUUUGGA-3'. Using the extract shown, which amino acids does the ribosome now add after methionine?
A point mutation changes an mRNA codon from CCU to CCG. Both codons specify proline, so the protein is unchanged. What kind of mutation is this?
A single base is deleted near the beginning of a gene's coding sequence. Why does this usually change almost every amino acid after that point?
A tRNA carrying leucine has the anticodon 3'-GAA-5'. Which mRNA codon does it pair with?
A ribosome is reading the mRNA codon 5'-GCA-3'. Which anticodon must the tRNA that binds there carry?
Using the extract shown, which mRNA codon calls for tryptophan?
A tRNA carrying methionine has the anticodon 3'-UAC-5'. A student writes down the mRNA codon it reads as 5'-UAC-3'. Which codon does the tRNA actually read?
The ribosome is at the mRNA codon 5'-AAG-3', which calls for lysine. Which tRNA can bind there?
Phenylalanine is coded by the mRNA codons UUU and UUC. Which pair of anticodons do the tRNAs that carry phenylalanine have?
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Regulation of Gene Expression
20 questions
