Protein Synthesis & Mutations Review

Which molecules are involved in protein synthesis?

• tRNA, introns, & mutagens

• mRNA, introns, & rRNA

• rRNA, mRNA, & tRNA

• mRNA, tRNA, & mutagens

There are 64 codons and 20 amino acids. Which of the following is true?

• several different codons can specify the same amino acid

• each codon specifies a different amino acid

• some amino acids have no link to a codon

• each amino acid is specified by only one codon

Use your amino acid chart. Which amino acid is specified by the mRNA codon GUA?

• Glycine

• Valine

• Serine

• stop signal

Use your codon chart. Which mRNA codon specifies the same amino acid as CGA?

• UAC

• AGA

• UAA

• UGA

Most mutations _________

• have no effect on the organism

• are fatal to the organism

• are helpful to the organism

• are harmful to the organism

A chromosomal mutation can change the number of chromosomes in a cell.

• true

• false

A gene mutations affects the DNA of more genes than a chromosomal mutation.

• true

• false

The process in which mRNA is converted into a polypeptide chain (protein) is called

• transcription

• replication

• translation

• transfer

Which enzyme transcribes DNA into mRNA?

• sucrase

• RNA polymerase

• helicase

• lipase

Each of the following is true of RNA except

• RNA contains deoxyribose

• RNA contains a phosphate group

• RNA is single stranded

• RNA has the nitrogen base uracil