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Helen [10]
2 years ago
9

What are the electrical charges of a proton, neutron and electron?

Biology
1 answer:
pogonyaev2 years ago
5 0

Answer:

Protons are positive while nuetrons are negetive.

Expland nation:

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Describe the probable effects on gene expression in the lac operon of each mutation: a. Mutation in the lac operator that delete
Stella [2.4K]

Answer:

a. Reduces represor binding.

b. Constitutive expression of the operon.

c. Stronger promoter if it is more similar to the consensus sequence. Weaker promoter if less similar.

Explanation:

The lac operon is an operon required for lactose transport and metabolism in enteric bacteria such as <em>Escherichia coli</em>. <u>It is regulated by glucose and lactose availability</u> and consists of the following structural genes:

  • Lac z gene: encodes the enzyme β-galactosidase, which catalyzes the hydrolysis reaction of lactose into glucose and galactose.
  • Gene lac y: encodes the protein galactoside permease involved in the transport of lactose into the bacterium.
  • Lac a gene: encodes the enzyme thiogalactoside transferase, which catalyzes the transfer of the acetyl group of acetyl coenzyme A to 6-OH of a thiogalactoside acceptor. This gene is not related to lactose metabolism.
  • Promoter: region of DNA recognized by RNA polymerase for transcription.
  • Operator: region of DNA located between the promoter and the beginning of the structural genes, which is recognized by the repressor protein Lac I.
  • Repressor gene (lac I): encodes the Lac I repressor protein, which recognizes the operator region, where it binds. It prevents the transcription of genes under the control of this promoter but stimulates the binding of RNA polymerase. When the repressor is absent (in the presence of inducer which in this case will be lactose or IPTG), RNA polymerase will begin transcription.

The lac operon is under a type of negative regulation, where genes can always be transcribed, except when the Lac I repressor protein is bound to the operon region, for which it has a high affinity. In this case, the promoter of the lac I gene is constitutive, so the Lac I protein is permanently expressed and remains bound in tetramer form to the operon region, preventing the transcription of structural genes.

Since lactose is the inducer of the operon, it is able to bind to the Lac I repressor protein and generate a conformational change that decreases its affinity for the operon region. Thus, the operon region is left free, <u>RNA polymerase can freely transcribe the structural genes and β-galactosidase can degrade lactose to glucose plus galactose</u>. <u>In the absence of lactose, the Lac I repressor protein maintains its high affinity for the operator region, preventing RNA polymerase from transcribing the structural genes</u>. In this way, the system remains closed with consequent energy savings for the bacterium.

As a final clarification, actually the true inducing molecule of the lac operon is called allolactose, an isomer of lactose obtained by a transglycosylation occasionally carried out by β-galactosidase.

a. When there is a mutation in the lac operator that deletes most of the operator, then the repressor Lac I can no longer bind and RNA polymerase will begin transcription.

b. When there is a mutation in the Lac I gene that eliminates the binding of repressor to operator, then this protein can not produce the repression so there would be a constitutive expression of the operon.

c. Since the promoter us a region of DNA recognized by RNA polymerase for transcription, if there is a mutation here it will generate a stronger promoter in the case that this part is similar to a consensus sequence (the most commonly encountered nucleotides found at a certain location). In the case that it is less similar, then it will generate a weaker promoter.

7 0
3 years ago
What factors provide for the differences observed in the major land biomes on Earth
Westkost [7]

Average temperature and average precipitation

8 0
3 years ago
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Percy finds a rock in his backyard. It looks like several pebbles cemented together. Percy has found _____. a foliated rock an e
Svet_ta [14]

A sedimentary rock because it is know to have layers.

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The San Andreas Fault in California demonstrates earthquakes caused by
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Two tectonic plates scraping by each other
4 0
2 years ago
If you were running an experiment to determine the temperature at which beans sprout the fastest, what would be the variable?.
hoa [83]

The independent variable would be temperature, the dependent variable would be planted height/number of leaves, and all other factors would be constant variables in an experiment to find the temperature at which beans sprout the quickest.

<h3>What would be the variables, If you were running an experiment to determine the temperature at which beans sprout the fastest?</h3>

  • The independent variable would be temperature, the dependent variable would be planted height/number of leaves, and all other factors would be constant variables in an experiment to find the temperature at which beans sprout the quickest.
  • The modified variable used in the study serves as the independent variable. Different planted beans would be exposed to various temperatures to discover the temperature at which they sprout the quickest. As a result, in this situation, the temperature is acting as the independent variable.
  • The variable measured during the study whose value depends on the given controlled variable is known as the dependent variable. In this situation, the beans' growth would vary according to the temperature they are permitted to grow in. Thus, the dependent variable would be growth indicators like height, leaf count, etc.
  • The variables that are maintained constant throughout all subject groups during the study process are known as controlled or constant variables. Conditions should be maintained constant for all participants, excluding the independent and dependent variables. These all fall under the category of controlled or constant variables.

To learn more about independent variables:

brainly.com/question/17985429

#SPJ4

6 0
1 year ago
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