AP Biology: Gene Expression and Regulation Practice Test
AP Biology: Gene Expression and Regulation Practice Test
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Question 1 of 19
1. Question
A protein that binds to the operator and blocks the RNA polymerase
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Question 2 of 19
2. Question
What is the name of the stretch of DNA where RNA polymerase binds?
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Question 3 of 19
3. Question
What is the role of operons in prokaryote gene expression?
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Question 4 of 19
4. Question
The lac operon genes only become expressed if:
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Question 5 of 19
5. Question
The parts of a gene that do NOT code for amino acids in a protein are called
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Question 6 of 19
6. Question
A chemical modification of DNA that does not affect the nucleotide sequence of a gene but makes that gene less likely to be expressed.
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Question 7 of 19
7. Question
All of the following are true about DNA methylation EXCEPT
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Question 8 of 19
8. Question
DNA molecule segment is: TTACGCAAG.
The mutated DNA segment is TTACGCAAC. This is an example of ______ mutation.CorrectIncorrect -
Question 9 of 19
9. Question
What is being shown in the illustration?
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Question 10 of 19
10. Question
How can a person’s muscle cells have the same exact DNA sequences as their nerve cells even though the look and perform completely different?
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Question 11 of 19
11. Question
What structure of this molecule binds with the mRNA molecule?
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Question 12 of 19
12. Question
The PhyB gene encodes the PhyB protein, which helps plants sense the quality of light in their surroundings. An alignment between the first six amino acids of the wild type PhyB protein and a mutant form of the protein is shown in the following table. The mutant form of the PhyB protein is encoded by a version of the PhyB gene with a mutation in its coding sequence. Based on the information in the table, which of the following best describes the mutation in the PhyB gene?
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Question 13 of 19
13. Question
The following diagram illustrates four genes from the genome of a certainmammal. Different binding sites are labeled in the enhancer region of each gene. In order for a specific gene to be expressed in the mammal’s cells, all of the gene’s binding sites must be bound by transcriptional activators. The mammal’s skin cells contain activators that bind to sites B, D, and E, while the mammal’s liver cells contain activators that bind to sites A, C, and E. Which of the following is a likely pattern of gene expression for the mammal described above?
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Question 14 of 19
14. Question
Zika fever is an illness caused by the Zika virus, which is spread to people by mosquitoes of the genus Aedes. The nucleotide composition of the Zika virus genome is shown in the following table. According to the data in the table, the Zika virus genome is made up of
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Question 15 of 19
15. Question
The melanocortin-1-receptor (Mc1r) gene helps determine the coat color phenotype in rock pocket mice. A researcher collected DNA from individual rock pocket mice and used DNA sequencing to identify the order of nucleotides in the Mc1r gene for each mouse. A subset of the sequencing data, which shows the results for two mice, is shown in Figure 1.
Figure 1: DNA sequencing data for positions 45-56 of the Mc1r gene in two rock pocket mice. Which of the following can be determined from the data in Figure 1?
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Question 16 of 19
16. Question
Researchers have developed a drug that disrupts gene expression in a parasitic species of fungi. The drug functions by preventing the complementary binding of tRNA with an mRNA molecule. This drug most likely targets the
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Question 17 of 19
17. Question
The following diagram represents the flow of genetic information from DNA to protein. Which of the following describes an event that occurs during Step 3 in the diagram?
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Question 18 of 19
18. Question
Which of the following models most accurately represents the process of DNA replication over two cell divisions?
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Question 19 of 19
19. Question
Humans can engineer microorganisms to synthesize useful chemicals. For example, humans have engineered bacteria to make erythromycin A, an antibiotic commonly used to treat infections. Erythromycin A is naturally made by the bacterium Saccharopolyspora erythraea. However, S. erythraea bacteria are slow- growing and difficult to manipulate in the laboratory. So, scientists copied the S. erythraea genes necessary for erythromycin A synthesis, and moved them into the common laboratory bacterium Escherichia coli.
To do this, the scientists first extracted DNA from S. erythraea cells, and then amplified the erythromycin A synthesis genes. The scientists then used the amplified DNA to make recombinant plasmids containing the genes’ sequences. They introduced the plasmids into E. coli cells, and then cultured the cells. Finally, they used chromatography to confirm that the E. coli cells now produced erythromycin A.
Which of the following techniques could the scientists have used to introduce therecombinant plasmids into E. coli cells?CorrectIncorrect