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- 1. Multiple Choice
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
- 2. Multiple Choice
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
- 3. Multiple Choice
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?
- 4. Multiple Choice
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.
- 5. Multiple Choice
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
- 6. Multiple Choice
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.
- 7. Multiple Choice
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
- 8. Multiple Choice
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.
- 9. Multiple Choice
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.
- 10. Multiple ChoiceWhat are the functions of genes?instructions for producing proteinsinstructions for producing DNAinstructions for producing lipidsthey have no function
- 11. Multiple ChoiceWhat does mRNA do?provides information from DNA to ribosomestransfers amino acids to the ribosomesmakes up ribosomesbuilds proteins
- 12. Multiple ChoiceWhat does rRNA do?provides information from DNA to ribosomestransfers amino acids to the ribosomesmakes up ribosomesbuilds proteins
- 13. Multiple ChoiceWhat does tRNA do?provides information from DNA to ribosomestransfers amino acids to the ribosomesmakes up ribosomesbuilds proteins
- 14. Multiple ChoiceIn RNA, adenine bonds withcytosineguaninethymineuracil
- 15. Multiple ChoiceCodons contain ______ bases1369
- 16. Multiple Choice
Which RNA bases would pair with CCG TAA in transcription?
AUG CUU
GGC AUU
GCU ACC
GCA ATT
- 17. Multiple ChoiceWhat will be the resulting mRNA from this DNA sequence:
GAT-TAC-AGA-TTA-CAT?CTA-ATG-TCT-AAT-GTAGAU-UAG-UGA-UUA-GUTCUA-AUG-UCU-AAU-GUACAT-ACA-TAC-ATA-TAG - 18. Multiple ChoiceWhich amino acid is made from the RNA codon GUA?PhenylalanineLeucineSerineValine
- 19. Multiple ChoiceWhat amino acid is represented by the codon CAG?Aspartic AcidHistidineGlutamineMethionine
- 20. Multiple ChoiceMost gene regulation happens at which step along the way?translationtranscriptionsignal transductionDNA replication
- 21. Multiple Choicewhat does a promoter do?it allows a gene to be transcribedit creates a DNA segmentit is another word for ribosomesit is another word for RNA
- 22. Multiple ChoiceA protein that binds to the operator and blocks the RNA polymeraseregulatorrepressoractivatorcorepressor
- 23. Multiple ChoiceIn eukaryotes, proteins that help the RNA polymerase bind to the regulatory region for transcription are called ____________.transcription factorstopoisomeraseregulatory genesactivators
- 24. Multiple ChoiceWhat does the lactose do to the Operon?Blocks transcription because of the energy it providesAllows the repressor to be unbind from the Operator.The lactose binds the lactose and stops transcriptionAllows for the transcription to speed
- 25. Multiple ChoiceWhat is the role of operons in prokaryote gene expression?It makes the genes prokaryotes be turned onIt accounts for the regulation of gene activity in response to the needs of the cellsTo make DNA for the geneTo make the gene turn of and off
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