Answer:
Explanation:
a) Drug X binds to the secondary site or co-agonist site of the receptor since it has no effect on contraction.
b) Drug Y binds to the primary site or agonist site of the receptor since it elicits contraction when aorta is exposed to it.
c) Drugs X and Y have a synergistic effect because the sum of their forces measured independently is larger than when they are tested simultaneously.
Answer:
It helps them make more than one of a species in the Earth. Without reproduction, humans and every other living organism wouldn't be on Earth.
Explanation:
^^
Answer:
a. The original spraying has caused a permanent mutation, giving the insects genetic resistance to the spray.
Explanation:
This is a practical evidences of mutation and variation, as mechanisms of evolution.
The insecticide is the selective pressure. As a results of continuous spray, the parents of the present mosquitoes must have acquired certain characteristics or traits by gene mutation which makes them resistant to the selective pressure (insecticides), and therefore survive the spray in the past.
Therefore when these resistant parents mated, with high reproductive success (leading to large gene pool of these traits,); variation in the genetic composition increases as the resistant gene is passed from generations to generations in the population. Therefore, the population of present day mosquito with genetic resistance to insecticides increases.They are therefore naturally selected, and able to survive as the present day mosquitoes with high resistance to insecticides.
In most cases, one uses tests whose size is equal to the significance level.
i would say by collecting data
<span>It is approximately 23 hours and 56 minutes, so rounded to the nearest hour, would be 24 hours.
Hope this helps!</span>
