Answer:
Receptors are highly specific and only have high affinity for those ligands for whom they are specific.
Explanation:
Receptors are proteins that receive a stimulus or bind a ligand and mediate effects via receptor effector system.
Receptors are macromolecules that are highly specific.
The affinity between the ligand and the receptors is determind by the disassociation constant Kd.
The receptors produce maximun effect when an appropriate specific stimulus is present.
Different recptors types are present for different ligands.
For example, muscrinic receptors are specific for acetycholine and adrenergic receptors are specific for adrenaline/nor adrenaline.
It is important to know the specificity so that the body remains in a state of balance.
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Answer:
C
Explanation:
Positive natural selection, or the tendency of beneficial traits to increase in prevalence (frequency) in a population, is the driving force behind adaptive evolution. ... At the molecular level, selection occurs when a particular DNA variant becomes more common because of its effect on the organisms that carry it.
Answer:
¿Qué es el mutualismo?
El mutualismo es una interacción biológica, entre individuos de diferentes especies, en donde ambos se benefician y mejoran su aptitud biológica. Las acciones similares que ocurren entre miembros de la misma especie se llaman cooperación.
¿Características del mutualismo?
ExplanatiLa primera característica se refiere a que es una interacción entre individuos de especies diferentes, por lo que se trata de una interacción inter-específica.
– Es una interacción doble positiva, ya que los individuos que realizan la relación salen beneficiados mutuamente.
– Los organismos involucrados pueden evolucionar hacia el aprovechamiento de ambas, es decir, coevolucionan y formar sociedades de tipo simbióticas.on:
