AP Biology: Gene Expression and Regulation Practice Test

A protein that binds to the operator and blocks the RNA polymerase

What is the name of the stretch of DNA where RNA polymerase binds?

What is the role of operons in prokaryote gene expression?

The lac operon genes only become expressed if:

The parts of a gene that do NOT code for amino acids in a protein are called

A chemical modification of DNA that does not affect the nucleotide sequence of a gene but makes that gene less likely to be expressed.

All of the following are true about DNA methylation EXCEPT

DNA molecule segment is: TTACGCAAG.
The mutated DNA segment is TTACGCAAC. This is an example of ______ mutation.

What is being shown in the illustration?

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?

What structure of this molecule binds with the mRNA molecule?

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?

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?

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

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?

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

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?

Which of the following models most accurately represents the process of DNA replication over two cell divisions?

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?