Gene Expression Transcription Pogil

The diagram shows the process in which pre-mRNA is changed into mRNA.

Which events are described in the diagram?

• Introns are removed, and remaining exons are spliced together

• Exons are removed, and remaining introns are spliced together

• Introns and exons are removed, and remaining DNA is spliced together

• Introns are removed, condensed and then combined again

Consider this sequence of nucleotides in an mRNA molecule.

AGGGUCCAA

Which could describe the translation of this sequence?

• 3 codons that are translated into 3 amino acids

• 3 codons that are translated into 9 amino acids

• 3 codons that are translated into 3 polypeptides

• 9 nucleotides that are translated into 9 amino acids

Percy is studying the diagram shown here. The diagram is one fourth of a larger diagram that explains the genetic code.

By studying the diagram, Percy would be MOST LIKELY to construct an answer to which of these questions?

• How many codons make up a typical mRNA molecule?

• Are specific codons associated with introns and exons?

• Which amino acid is most common in a typical protein?

• Are all codons translated into amino acids?

In prokaryotes, certain proteins act to regulate genes by binding to DNA. What could be the effect of these binding proteins?

• They may act to turn on or turn off gene transcription.

• They may become added to DNA, and then be transcribed

• They may remove a gene from DNA.

• They may alter the nucleotide sequence in a gene.

In E. coli, a cluster of three genes called the lac (promoter / repressor / operator / operon) produce enzymes that break apart lactose. To the side of the genes is a region called the (promoter / repressor / operator / operon), where RNA polymerase binds, and another region called the (promoter / repressor / operator / operon), where the lac repressor binds.

Select all that apply.

• promoter

• repressor

• operator

• operon

Velma is developing a computer model of translation. Her instructor points out that the model does not include ribosomes or ribosomal RNA.

If the model is accurate in other ways, how does the absence of ribosomes and ribosomal RNA affect it?

• Certain amino acids would be missing from the polypeptides.

• The polypeptides would be much longer than normal.

• Amino acids would be joined together in an incorrect order.

• Amino acids would not join together, and no polypeptides would form.

In which ways is RNA different from DNA? Select three properties that apply to RNA, but not DNA.

• generally single-stranded

• contains thymine

• contains uracil

• contains the sugar ribose

Which of these events occurs first during the process of transcription?

• RNA polymerase joins nucleotides into the RNA molecule.

• RNA polymerase binds to the promoter.

• Introns are removed from the RNA molecule.

• Exons are removed from the RNA molecule.

George is studying a computer model of a DNA molecule, in which the letters

A, C, G, and T are listed in a very long sequence. The model includes a total of 2000 genes that are scattered along the full length of the molecule. The genes make up only a small fraction of the molecule.

George wants to identify the locations of the genes. Which would be the MOST USEFUL first step to follow?

• Divide the model molecule into 2000 segments of equal size.

• Identify all of the start codons in the model molecule.

• Identify the promoter regions in the model molecule.

• Divide the model molecule into three-letter pieces.

What are the functions of genes?

• instructions for producing proteins
• instructions for producing DNA
• instructions for producing lipids
• they have no function

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