Chapter 36 Practice Quiz

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Chapter 36 Practice Quiz  Due Dec 6 at 11:59pm  Points 11  Questions 11  Time Limit 30 Minutes  Allowed Attempts 2 Attempt History Attempt Time Score KEPT Attempt 2 3 minutes 11 out of 11 LATEST Attempt 2 3 minutes 11 out of 11 Attempt 1 6 minutes 10 out of 11 Correct answers are hidden. Score for this attempt: 11 out of 11 Submitted Dec 6 at 1:44am This attempt took 3 minutes.

Question 1 1 / 1 pts Which of the following is NOT a difference between DNA and RNA synthesis? the need for a primer the direction of synthesis the simultaneous coding from both strands of DNA. the presence of discrete termination signals the nature of the nucleotide used Question 2 1 / 1 pts During transcription, separation of the DNA strands is necessary. This involves: separation of the DNA into single stranded stem-loops. separation of the DNA with association of single-stranded-binding proteins. separation of the DNA strands one base pair at a time. separation in only a small segment of DNA at a time.

separation of long segments of the DNA corresponding to genes. Question 3 1 / 1 pts The prokaryotic RNA polymerase holoenzyme has an α2 β β' σ subunit structure. Which of the following statements is TRUE regarding this enzyme? The α2 and σ subunits are involved in initiation of transcription and dissociate from the β and β′ subunits after RNA synthesis begins. The σ subunit is only involved in initiation of transcription and dissociates from the enzyme after RNA synthesis begins. Although present throughout the transcription process, the σ subunit is required for recognition of promotor sites but not for elongation steps in RNA synthesis. The holoenzyme is required in all steps of transcription. The β, β′, and σ subunits are involved in initiation of transcription and dissociate from the α2 subunits after RNA synthesis begins. Question 4 1 / 1 pts The structural genes in an operon are transcribed individually as separate mRNAs when an operator is bound by the regulator.

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are all cotranscribed as a single mRNA when the operator is not bound by the regulator. are transcribed individually when the regulator molecule is bound at the operator for each gene. are all co-transcribed as a single mRNA when the operator is bound by the regulator. are transcribed individually as separate mRNAs when an operator is not bound by the regulator. Question 5 1 / 1 pts In E. coli, the lac operon is turned on by a derivative of lactose (allolactose) binding to the gene for a structural protein, which when produced binds to the regulator of the lac operon and initiates its transcription. a derivative of lactose (allolactose) binding to a regulatory protein which is bound to the operator of the lac operon and resulting in the release of the regulatory protein from the operon. a derivative of lactose (allolactose) binding to the operator of the lac operon and causing release of the regulatory protein from the operon. a derivative of lactose (allolactose) binding to the gene for a regulatory protein which when produced binds to the operator of the lac operon and initiates its transcription.

a derivative of lactose (allolactose) binding to a regulatory protein which is bound to the operator of the lac operon which can only be transcribed when the lactose-regulatory protein complex is bound to the operator. Question 6 1 / 1 pts The catabolite activator protein (CAP) is also involved in regulation of transcription of certain prokaryotic genes. It functions by binding to RNA polymerase forming a complex which enhances the activity of the polymerase although the CAP is not in contact with DNA. binding to DNA in the region of promoter sites and recruiting RNA polymerase there. forming a complex with cAMP which binds to DNA in the region of promotor sites and blocks RNA polymerase access there. forming a complex with cAMP which binds to DNA in the region of promoter sites and recruiting RNA polymerase there. binding to RNA polymerase forming a complex that inhibits RNA polymerase activity. Question 7 1 / 1 pts What are biofilms? deposits of waste material left behind from the decay of complex arrangements of bacteria

Thin layers of bacteria that are identically replicated. complex arrangements of bacteria that appear to "sense" other cells and regulate their genes for a common purpose complex arrangements of bacteria that appear to sense other cells and regulate their genes to gain a competitive advantage lipid-rich bacteria that form on surfaces Question 8 1 / 1 pts Acyl homoserine lactones that are secreted by prokaryotes into the medium to regulate the transcription of genes in other cells are called inhibitors. operators. autoinducers. attenuators. repressors. Question 9 1 / 1 pts During RNA synthesis, the coding strand:

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is also referred to as the template strand. is also referred to as the plus strand. has the same sequence as the RNA transcript. is also referred to as the sense strand. is complementary to the RNA transcript. Question 10 1 / 1 pts If glucose is scarce, but lactose is available, the lac operon will act to increase the levels of these proteins. β-galactosidase and galactosidepermease β-galactosidase and allolactose β-galactosidase and inducer inducer and galactosidetransacetylase galactosidepermease and allolactose

Question 11 1 / 1 pts Which of the following genes in the lac operon encodes lac permease? lacA lacY lacI lacZ Quiz Score: 11 out of 11

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