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Allolactose is a disaccharide similar to lactose. It consists of the monosaccharides D-galactose and D-glucose linked through a β1-6 glycosidic linkage instead of the β1-4 linkage of lactose. It may arise from the occasional transglycosylation of lactose by β-galactosidase.
It is an inducer of the lac operon in Escherichia coli and many other enteric bacteria. It binds to a subunit of the tetrameric lac repressor, which results in conformational changes and reduces the binding affinity of the lac repressor to the lac operator, thereby dissociating it from the lac operator. The absence of the repressor allows the transcription of the lac operon to proceed. A non-hydrolyzable analog of allolactose, isopropyl β-D-1-thiogalactopyranoside (IPTG), is normally used in molecular biology to induce the lac operon.




See also


Inducer
Lac operon § Regulation by allolactose
Lac repressor




External links


allolactose at the U.S. National Library of Medicine Medical Subject Headings (MeSH)
Illustration of function

Kata Kunci Pencarian:

• Allolactose
• Lac repressor
• Lac operon
• Isopropyl β-D-1-thiogalactopyranoside
• Operon
• C12H22O11
• Β-Galactosidase
• Biology
• Inducer
• Disaccharide

How To Say Allolactose - YouTube

Allolactose - Alchetron, The Free Social Encyclopedia

Allolactose - Alchetron, The Free Social Encyclopedia

allolactose | 645-03-4

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Lactose 500 g

Gene Regulation

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Contribution | HSASNU - iGEM 2023

Allolactose 28447-39-4 | Tokyo Chemical Industry Co., Ltd.(APAC)

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allolactose

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• Solved Allolactose, an isomer of lactose, is formed in small - Chegg
• Solved Allolactose is an important molecule in regulation of - Chegg
• Solved How does lactose (allolactose) act as an INDUCER in
• Solved QUESTION 10 the small effector molecule allolactose
• Solved CH2 2) Allolactose (shown on the right) is the - Chegg
• Solved 8. An example of a gene product encoded by a - Chegg
• Solved 2. The concentration of allolactose increases in the - Chegg
• Solved The repressor protein in the lac operon binds to A ... - Chegg
• Solved QUESTION 6 Normally, lactose is converted to - Chegg
• Solved Allolactose is an isomer of lactose. Use the - Chegg

Solved Allolactose, an isomer of lactose, is formed in small - Chegg

Allolactose, an isomer of lactose, is formed in small amounts from lactose. An E. coli cell is presented for the first time with the sugar lactose (containing allolactose) as a potential food source. Which of the following occurs when lactose enters the cell? Allolactose binds to the repressor protein. O RNA polymerase attaches to the regulator.

Solved Allolactose is an important molecule in regulation of - Chegg

Ob. Lactose is a reducing sugar, while allolactose is not. Oc. Lactose contains a B-glycosidic bond; allolactose contains an a-glycosidic bond. Od. Lactose contains a 1-4 glycosidic bond; allolactose contains a 1-6 glycosidic bond. Oe. None of these statements describes differences between lactose and allolactose.

Solved How does lactose (allolactose) act as an INDUCER in

b. Allolactose is broken down by the lacZ protein, and the cell can use lactose as an energy source O c. Allolactose binds to the lacl protein (repressor), this induces a conformation change in lacl, it binds more tightly to the lac operator RNA polymerase can't transcribe the lacZ gene, and the cell can't use lactose as an energy source. d.

Solved QUESTION 10 the small effector molecule allolactose

Science; Biology; Biology questions and answers; QUESTION 10 the small effector molecule allolactose does what to the regulatory protein in the lac operon it allows the repressor to bind to the operator and lowers the expression of the operon in allows the activator to bind the operator and increases the expression of the operon it prevents the repressor from binding to the …

Solved CH2 2) Allolactose (shown on the right) is the - Chegg

CH2 2) Allolactose (shown on the right) is the molecule that binds the lac repressor in nature. Allolactose is made from lactose by the Lacy. protein (in the lac operon), then hydrolyzed by B-galactosidase (lacz), a key enzyme used to control for mutagenesis and transformation.

Solved 8. An example of a gene product encoded by a - Chegg

8. An example of a gene product encoded by a regulatory gene is. a. beta-galactosidase enzyme. b. allolactose. c. repressor protein.

Solved 2. The concentration of allolactose increases in the - Chegg

2. The concentration of allolactose increases in the cell when lactose becomes available. Allolactose binds to the I repressor gene, which inactivates it and upregulates transcription. Is the lac operon inducible or repressible? (1) Complete the chart, assuming an absence of glucose. “Absent" or "Present" refers to the absence or presence of ...

Solved The repressor protein in the lac operon binds to A ... - Chegg

The repressor protein in the lac operon binds to A. lactose (or allolactose) only. B. lactose (or allolactose) and the promoter. C. lactose (or allolactose) and the operator. D. the operator and the promoter. E. the operator only.

Solved QUESTION 6 Normally, lactose is converted to - Chegg

O RNA polymerase binds in place of the lac repressor O β-galactosidase is also expressed by a second gene O a second protein can convert lactose to allolactose O no answers are correct QUESTION 7 A recessive gene can be defined as the following O A. an intermediate allele that is capable of having an impact on the phenotype of the dominant ...

Solved Allolactose is an isomer of lactose. Use the - Chegg

Question: Allolactose is an isomer of lactose. Use the structure of allolactose shown below to answer the following questions но ењ OH он н CH2 НН 0 он нон он н 0 нон Allolactose (a) (1 point) Identify and label the monosaccharides that allolactose is made from.