Exam 17: From Gene to Protein

Use the following information to answer the questions below. Yeast is capable of synthesizing the amino acids necessary for survival and can grow on minimal media or enriched media easily.In both conditions,the colonies have a cream colour.The production of adenine is regulated by two genes,ADE1 and ADE2.If either of these genes is defective,adenine cannot be synthesized and the colony will look red (as a result of accumulation of precursors).A common undergraduate lab study is to irradiate yeast cells with ultra violet light from 2-5 sec up to 1-5 minutes,and see what will happen. -What is the role of UV light in this circumstance?

What molecular structure are codons part of?

Which of the following provides some evidence that RNA probably evolved before DNA?

Use the following information to answer the next few questions. The enzyme polynucleotide phosphorylase randomly assembles nucleotides into a polynucleotide polymer. -You add polynucleotide phosphorylase to a solution of ATP,GTP,and UTP.How many artificial mRNA 3 nucleotide codons would be possible?

Why might a point mutation in DNA make a difference in the level of protein's activity?

The "universal" genetic code is now known to have exceptions.Evidence for this can be found if which of the following is true?

The following information should be used for the next few questions. A part of an mRNA molecule with the following sequence is being read by a ribosome: 5' CCG-ACG 3' (mRNA).The following charged transfer RNA molecules (with their anticodons shown in the 3' to 5' direction)are available.Two of them can correctly match the mRNA so that a dipeptide can form. -The anticodon loop of the first tRNA that will complement this mRNA is

What is the effect of a nonsense mutation in a gene?

Which one of the following,if missing,would usually prevent translation from starting?

The white fur colouration of the "spirit bear" of British Columbia,is a result of

During elongation,which site in the ribosome represents the location where a codon is being read?

Transcription in eukaryotes requires which of the following in addition to RNA polymerase?

How do eukaryotic codons and prokaryotic codons compare?

Which of the following contradicts the one-gene,one-enzyme hypothesis?

The TATA sequence is found approximately 25 nucleotides upstream from the start site of transcription.This most probably relates to which of the following?

The following questions refer to this figure of a simple metabolic pathway: -If A,B,and C are all required for growth,a strain that is mutant for the gene-encoding enzyme A would be able to grow on which of the following media?

Which of the following is a function of a signal peptide?

Which of the following mutations is most likely to cause a phenotypic change?

When the function of the newly made polypeptide is to be secreted from the cell where it has been made,what must occur?

The following questions refer to this figure of a simple metabolic pathway: -If A,B,and C are all required for growth,a strain mutant for the gene-encoding enzyme B would be capable of growing on which of the following media?