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lesya [120]
3 years ago
14

Explain why it is correct to say that the air and good passages cross in the pharynx?

Biology
1 answer:
Verdich [7]3 years ago
6 0
Air must pass from the back to the front of the pharynx to enter the trachea and food must pass from the front to the back of the esophagus
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A scientist runs an SDS-PAGE experiment two separate times on a protein with a molecular weight of 200 kD. For the first experim
Delicious77 [7]

Answer:

This protein consists of 8 subunits of equal size linked by disulfide bonds

Explanation:

The sodium dodecyl sulfate-polyacrylamide gel (SDS-PAGE) is a technique widely used in molecular biology laboratories to separate proteins with molecular weights between 5 and 250 kDa. SDS is an anionic detergent used to denature proteins before electrophoresis. SDS can denature proteins by altering non-covalent bonds such as hydrogen, hydrophobic and ionic interactions, but they cannot cleave disulfide bonds. In this case, reducing agents (e.g.,  β-mercaptoethanol or dithiothreitol) have been used to cleave disulfide bonds.

3 0
2 years ago
It is thought that organelles of eukaryotic organisms, such as mitochondria and chloroplasts (in plant cells) came from
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hello! its prokaryotic!

Explanation:

8 0
3 years ago
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Where was the ring necked pheasant imported from
Firdavs [7]

They were imported from China into the United States in 1881.

The first successful release was in Minnesota in 1916.

Hope this helps! :)

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3 years ago
Which of the following best describes anabolic reactions?
cupoosta [38]
Reaction which breaks down complex molecules into simpler ones n release energy
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2 years ago
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Una solución de 0.204 M de NaOH seutiliza para neutralizar 50 mL de una solución de H3PO4. Si se necesitaron 16.4 mL de la soluc
vfiekz [6]

Answer: 0.05 M

Explanation:

Para responder esta pregunta, hay que tener en cuenta la Ley de Conservación de la Masa. <u>La misma indica que en una reacción química en un sistema cerrado, la masa total de las moléculas que participan permanece constante.</u> Esto significa que la masa utilizada en los reactivos es la misma que la masa de los productos generados.

En este problema, se cuenta con una solución de NaOH (hidróxido de sodio) tiene una molaridad de 0.204 (siendo la molaridad el número de moles por litro de solución) y se utilizan 16.4 mL de dicha solución para agregarla a 50 mL de una solución de H3PO4 (ácido fosfórico).

Entonces, ya que la masa de ambas soluciones no se pierde, podemos utilizar la ecuación de la Ley de Conservación de la Masa:

Concentración inicial x Volumen inicial = Concentración final x Volumen final.

Concentración inicial: 0.204 M

Volumen inicial: 16.4 mL

Concentración final: ?

Volumen final: 50 mL + 16.4 mL = 66.4 mL

Reemplazamos los valores en la ecuación:

0.204 M x 16.4 mL = Concentración final x 66.4 mL

La molaridad de la solución de H3PO4 es de 0.05 M.

7 0
3 years ago
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