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nika2105 [10]
3 years ago
6

True or false? The lac operon operates by having the repressor only leave the operator when it is bound to the lactose molecule

Biology
1 answer:
S_A_V [24]3 years ago
7 0

Answer:

true

Explanation:

When lactose is not available, the lac repressor binds tightly to the operator, preventing transcription by RNA polymerase. However, when lactose is present, the lac repressor loses its ability to bind DNA. It floats off the operator, clearing the way for RNA polymerase to transcribe the operon

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URGANT QUESTION !! What are the main redox reactions in cellular respiration ?
Nikitich [7]

En la respiración celular, la célula depende totalmente de las reacciones Redox, para ser precisos de la reducción del NAD a NADH y la oxidación de NADH a NAD.

Ahora veamos una situación diferente.

En la fotosíntesis, ocurre la reacción inversa de redox, como se muestra en la siguiente ecuación:

6CO2 + 6H2O + E --> C6H12O6 + 6O2

La energía biológica se almacena y se lanza con la frecuencia por medio de reacciones redox. La fotosíntesis implica la reducción del CO2 en azucares y la oxidación del H2O en oxigeno molecular (O2), mientras que en la respiración es lo inverso, la oxidación de azucares a CO2 y H2O.

Entre los pasos redox de la fotosíntesis, compuestos deducidos del CO2 reducen el NAD lo que crea entonces, la creación gradiente de protones, que conduce a la síntesis del ATP y es mantenida por la oxidación del O2.

En los seres vivos, el término redox se utiliza para describir el equilibrio NAD-NADH y NADP-NADPH.

El estado redox contribuye al equilibrio de los sistemas metabólicos. En el caso de alteraciones en las reacciones redox, puede producirse HIPOXIA, que es el déficit del O2 en la sangre, CHOQUE, que es el mal circulamiento de lal sangre y la SEPSIS.

3 0
4 years ago
What MOSTLT determines the chemical properties of the atoms of an element
Nata [24]

Answer:

The chemical properties of an element are determined by the configuration of its electrons in orbit around its nucleus.

Explanation:

The number of electrons in each element’s outermost valence shell, is the primary factor in determining its chemical properties. The number of electrons in an atom are equal to the number of protons in the nucleus so the electrical charges balance each other. The number of protons in the nucleus of an atom is its Atomic Number.

6 0
3 years ago
What valve separates two chambers and how do they function by preventing the
Iteru [2.4K]

Answer:

bicuspid and tricuspid valve

Explanation:

Tricuspid valve separates right auricle and ventrical whereas bicuspid separates left auricle and ventrical.

they help by preventing the back flow of the blood by avoiding them to go to the position where they came from.

6 0
3 years ago
Cuando fue introducido el jacinto de agua a Chile?
goblinko [34]

Answer:

Lugar y fecha de introducción: El jacinto de agua fue introducido desde su hogar natal en América del Sur a varios países por personas bien intencionadas como planta ornamental; a los Estados Unidos en la década de 1880. Se introdujo en Egipto alrededor de 1879. Se extendió al Congo, el Nilo y el lago Victoria en la década de 1950.

Explanation:

3 0
3 years ago
Which of the following best describes a nuclear fusion reaction?
Jet001 [13]

Answer:

A reaction that joins the nuclei of two atoms into one  

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So, nuclear fusion is the joining of two nuclei into one.

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8 0
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