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zimovet [89]
3 years ago
15

Which of the following is correct about the polyadenylation mechanism?

Biology
1 answer:
kiruha [24]3 years ago
8 0
<span> a. A long chain of adenine nucleotides is added to the 3' end of mRNA during termination of transcription is the correct about the polyadenylation mechanism.
hope it helps
</span>
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Que tipo de aislamiento reproductivo exhibe la mula?
bulgar [2K]

Answer:

<em>Aislamiento postreproductivo: Esterilidad del híbrido</em>

Explanation:

El concepto biológico de <u>especie</u>, en su definición, destaca que los ejemplares de una especie no pueden entrecruzarse con ejemplares de otra especie distinta, o bien, en caso de hacerlo, no hay éxito reproductivo.

Existen distintos mecanismos de aislamiento reproductivo, que son barreras que inhiben o interrumpen el flujo génico entre especies distintas. Se trata de caracteres biológicos propios de cada especie que previenen la reproducción con otras especies.

Estos mecanismos de aislamiento reproductivo pueden ser precigóticos o postcigóticos.  

  1. Pre-copulatorios o pre-cigóticos:
  • Ecológico o por aislamiento de hábitat;
  • Estacional o temporal;
  • Sexual o etológico;
  • Mecánico;
  • Por incompatibilidad de gametas.  

   2. Post-copulatorios o cigóticos:

  • Inviabilidad del híbrido;
  • Esterilidad del híbrido;
  • Híbrido con viabilidad o fertilidad disminuido;
  • Interacciones citoplasmáticas.

La mula es producto de la cruza entre dos especies distintas: una yegua (<em>Equus ferus caballus</em>) y un burro (<em>Equus africanus asinus</em>). Es un ejemplo de la accion de mecanismo poscigótico, en el cual se forma un híbrido viable esteril. Este ejemplar puede nacer crecer y sobrevivir, pero que no pueden producir gametas funcionales, por lo cual no pueden reproducirse.        

4 0
3 years ago
The blood cells containing hemoglobin, an iron-containing protein that transports oxygen, are called __________.
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<span><span>The blood cells containing hemoglobin,  that transports oxygen (O2) to the body tissues of vertebrates, are called red blood cells.</span> Red blood cells (RBCs), are also referred to as red cells, red blood corpuscles, haematids, erythroid cells or erythrocytes<span>, (from Greek erythros for "red" and kytos for "hollow vessel"..RBCs take up oxygen in the lungs and release it into tissues while squeezing through the body's capillaries.</span></span>

<span> </span>

7 0
3 years ago
A challenge to traditional (pre-1860) ideas about species came from embryology, when it was discovered that _____. see concept 2
timofeeve [1]
A challenge to traditional (pre-1860) ideas about species came from embryology, when it was discovered that embryos of dissimilar organisms, such as sharks and humans, resemble each other. Embryology involves the study of the formation and the development of an embryo and the fetus. It is one type of evidence of evolution such that the embryos of many different kinds of animals, mammals, reptiles, birds, fish among others, are similar showing a common ancestry. 
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3 years ago
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Choose three machines which convert straight motion to circular motion:
Nat2105 [25]
There are 3 machines in which convert straight motion to circular motions:

Answer is water wheel, windmill, and water turbine.

Hope it helped you, and have a great day!

-Charlie
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3 years ago
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5 Which answer best describes how
valentinak56 [21]
Yes it is C but for future reference, both A and B are referring to solids, and D is referring to a gas, hope this is helpful later!
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3 years ago
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