WorksheetsUnit 6 - DNA and Gene Expression Review
Total questions: 12
Worksheet time: 7mins
Refer to the codon chart. The mRNA sequence has the code CAG. It is most likely to bond with a tRNA that has which amino acid?
Stop
Met
Val
Gln
A DNA strand has the following bases: CGT ACG. What are the bases on the complimentary strand?
What is the name of this process: mRNA to protein.
What did the original DNA sequence look like that produced a mRNA strand with the sequence UGC AUU?
DNA replication is a semiconservative process because one half of the new DNA strand is the parental strand and the other is the newly replicated strand.
True
False
Proteins are formed in the cytoplasm using genetic instructions from the DNA in the nucleus. How does the genetic information get to the site of protein synthesis?
mRNA traveled from the nucleus to the cytoplasm
tRNA traveled from the nucleus to the cytoplasm
DNA is divided and sent out to the cytoplasm
rRNA is transcribed from the DNA and binds with mRNA to make proteins
Which of the following best describes the concept of a genetic mutation?
Which of the following indicates that all organisms can be traced back to a common ancestry?
Almost all genes in microorganisms, plants, and animals have the same codons
If an error occurs during transcription but the change still codes for the same codons as before, would there be any change in the phenotype?
Yes
No
Which statement correctly describes the difference between DNA transcription and DNA replication?
A DNA segment mutated from its original sequence of GGG TAT CTA to GGG TTT CTA. What type of mutation is this?
Duplication
Insertion
Substitution
Deletion
Use the codon chart.
During transcription the DNA base sequence is transcribed into a complimentary mRNA sequence. A segment of DNA has undergone a mutation in which one nucleotide has been changed.
The original sequence was CUG and the new sequence is CUC.
Use the codon chart to determine whether or not this mutation will cause a change in the phenotype of the organism.
Even though the DNA sequence was changed, it still codes for the same amino acid - so no change in the phenotype
Yes, the phenotype will change because of the new amino acid being coded for
It is impossible to determine if there will be a change
Yes, because any change in the DNA sequence will lead to a change in phenotype
