Regulatory proteins control gene expression by binding with the operator segement of the DNA to inhibit RNA Polymerase from transcription.

Regulatory proteins are involved in energy production.

Regulatory proteins are only found in bacteria.

Regulatory proteins are solely responsible for cell division.

What best describes the Trp Operon?

The Trp operon is a repressible operon that regulates tryptophan synthesis in response to its concentration.

The Trp operon is an inducible operon that promotes tryptophan synthesis.

The Trp operon is a structural gene that codes for enzymes unrelated to tryptophan.

The Trp operon is a regulatory element that enhances transcription of all genes.

The try operon adapation/rule

The trp operon is regulated by feedback inhibition of tryptophan levels in the environment.

The trp operon is activated by glucose.

The trp operon is always expressed regardless of tryptophan levels.

The trp operon is regulated by positive feedback.

What best describes the lac operon?

A genetic regulatory operon that controls the production of digestive enzymes used in the metabolism of lactose in bacteria.

A regulatory system for amino acid synthesis in yeast.

A genetic sequence that codes for antibiotic resistance.

A protein that breaks down glucose in bacteria.

The environmental conditions that turn the lac operon on

Presence of lactose and absence of glucose

Presence of glucose and absence of lactose

Presence of both glucose and lactose

Absence of both glucose and lactose

The environmental conditoins that turn the lac operon off

High glucose levels and low lactose levels.

High glucose levels and high lactose levels.

Low lactose levels and high protein levels.

High lactose levels and low glucose levels.

The lac operon adaptation

The lac operon allows bacteria to adapt to the presence of lactose by regulating gene expression of lactose digesting enzymes.

The lac operon does not involve any regulatory proteins.

The lac operon is a mechanism for protein synthesis in eukaryotes.

The lac operon is only active in the absence of lactose.

Repressible operon is an operon that can be turned off by a repressor molecule under specific environmental condtiions.

An operon that is always active

An operon that can only be activated by a promoter under specific environmental condtiions.

An operon that is permanently turned off

Inducible operon is a type of operon that can be activated in response to specific environmental signals.

Inducible operon is a type of operon that is permanently repressed.

Inducible operon is always active regardless of signals.

Inducible operon is a type of operon that cannot be turned off.

What is the best explanation for the lac operon as negative feedback?

The lac operon is regulated by a repressor that inhibits transcription in the absence of lactose.

The lac operon is activated by a promoter that enhances transcription in the presence of glucose.

The lac operon is controlled by an activator that promotes transcription regardless of lactose levels.

The lac operon is permanently active, allowing constant production of enzymes for lactose metabolism.

What is the best explanation for the trp operon as negative feedback?

The trp operon is regulated by negative feedback through the binding of tryptophan to the repressor.

The trp operon functions independently of tryptophan levels.

The trp operon is regulated by positive feedback mechanisms.

The trp operon is activated by the presence of tryptophan.

Using the image, Phase 1 on the Diaxic Growth for the graph indicates

initial growth phase with increasing optical density

What is DIAxic Growth measuring in the attached graph?

microbial growth is caused by the presence of two substrates in a culture growth media, when the microbial cells are capable of faster growth on one of these substrates. diauxie, diphasic, or double growth

relates microbial growth rates in an aqueous environment to the concentration of a limiting nutrient. monophasic or single growth

the process by which a parent cell divides into two daughter cells. Cell division usually occurs as part of a larger cell cycle in which the cell grows and replicates its chromosome(s) before dividing.

an increase in the total mass of a cell, including both cytoplasmic, nuclear and organelle volume. Cell growth occurs when the overall rate of cellular biosynthesis is greater than the overall rate of cellular degradation.

What best explains the lag at phase 1 on the graph?

the microbial organism switches the lac operon on once all the glucose is consumed

the microbial organism switches the trp operon on once all the glucose is consumed

the microbial organisms switches the lac operon on once all the lactose is consumed

the microbial organisms are consuming glucose and the colony population is increasing

What best explains the lag at Phase 2?

the microbial growth stops when the all the nutrients are consumed

the microbial colony is increasing as it is consuming the lactose

the microbial growth stops when all the glucose have been consumed.

the trp operon is activated to produce trypotphan for the microbial colony

Why does the microbial colony break down glucose before it consumes the lactose?

The microbial colony breaks down glucose first because it is a more efficient energy source.

Lactose is broken down first because it is easier to digest.

The microbial colony prefers lactose over glucose for energy.

Glucose is only used when lactose is not available.

How do prokaryotes regulate which genes to express?

Prokaryotes regulate gene expression using operons and transcription factors.

Prokaryotes express all genes at all times.

Prokaryotes use ribosomes to directly regulate gene expression.

Gene expression in prokaryotes is solely controlled by environmental temperature.

Histone methyltransferases are a class of enzymes that methylate certain amino acid sequences in histone proteins. A research team found that transcription of gene R decreases when histone methyltransferase activity is inhibited. Which scientific claim is most consistent with these findings?

Histone methylation opens up chromatin at gene R so transcription factors can bind to DNA more easily.

DNA methylation inhibits transcription of gene R.

Histone modifications of genes are usually not reversible.

Histone methylation condenses the chromatin at gene R so transcription factors cannot bind to ENA.

Figure 1 represents a metabolic process involving the regulation of lactose metabolism by E. coli bacteria. Lactose is utilized for energy by E. coli when glucose is not present. Allolactose is an isomer of lactose that is in the environment of these bacteria when lactose is present. The CAP site prevents the binding of RNA polymerase when glucose is present in the environment. The lac Z, lac Y, and lac A genes code for proteins needed for lactose metabolism. Which is a scientific claim that is consistent with the information provided and Figure 1 ?

When bound to the operator, the repressor protein prevents lactose metabolism in E. coli.

The presence of excess lactose blocks the functioning of RNA polymerase in this operon.

The binding of the repressor protein to the operator enables E. coli to metabolize lactose.

Allolactose acts as an inducer that binds to the operator, allowing E. coli to metabolize lactose.

Figure 1 illustrates processes related to control of transcription and translation in a cell. Which of the following scientific claims is most consistent with the information provided in Figure 1 ?

Different genes may be regulated by the same transcription factor.

Gene X codes for a transcription factor required for transcription of gene D.

A single transcription factor regulates transcription similarly, regardless of the specific gene.

Transcription of genes A, B, and C is necessary to transcribe gene E.

6.5 Operons

Interactive Video

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Science

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12th Grade

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Medium

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NGSS

HS-LS1-1, HS-LS1-3

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Rachel von Bodungen

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NGSS.HS-LS1-1

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34 questions

Show all answers

FILL IN THE BLANK QUESTION

1 min • 1 pt

Operons are found in ___________ cells

Answer explanation

This type of gene regulation is simplified and only works for smaller genes

DROPDOWN QUESTION

1 min • 1 pt

(a) are used for (b) to regulate which genes to express

Operons

prokaryotes

Operators

eukaryotes

Regulatory genes

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Operon

A single gene controlled by multiple promoters.

A type of protein that regulates gene expression.

A sequence of DNA that codes for a single protein.

Operon is a cluster of genes controlled by a single promoter to transcribe a single RNA.

Structual Genes

Structural genes are segments of DNA that code for proteins.

Structural genes are segments of RNA that code for lipids.

Structural genes are non-coding regions of DNA.

Structural genes are responsible for regulating gene expression.

Operator

operators are locations of genes that are to be transcribed

Operators are locations of a gene that RNA Polymerase binds to

Operators are locations of a gene where the repressor protein binds

Operators are the portion of a gene that codes for a regulatory protein

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Promoter

Promoters are the location of the gene that RNA Polymerase binds for transcription

Promotors are a cluster of genes that transcribe a single RNA

Promoters are the portion of the gene that code for a regulatory protein

Promoters are supporessing proteins that connects to the operator.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Regulatory Gene

Regulatory genes are the location of the gene that RNA polymerase binds to begin transcription

Regulatory genes are the location of the gene that the repressor protein binds to turn the gene expression on or off

Regulator proteins are the location of the genes that transcribe the structual genes.

Regulatory genes are the portion of the DNA that codes for producing regulatory proteins.

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6.5 Operons

34 questions

Operons are found in ___________ cells

This type of gene regulation is simplified and only works for smaller genes

​ ​ (a) are used for ​ (b) to regulate which genes to express

Operon

Structual Genes

Operator

Promoter

Regulatory Gene

Regulatory protein

What best describes the Trp Operon?

The environmental condtions that turn the trp operon on

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(a) are used for (b) to regulate which genes to express