DNA has three types of chemical component: phosphate, a sugar called deoxyribose, and four nitrogenous bases—adenine, guanine, cytosine, and thymine. Two of the bases, adenine and guanine, have a double-ring structure characteristic of a type of chemical called a purine.
Answer: The function of the Alveolar type II cells is that they secrete a lipoprotein material that is known as surfactant. The primary function of the surfactant is to reduce the surface tension in the alveoli.
Explanation:
Type II have an important function Type II as they secrete pulmonary surfactant in order to lessen the surface tension of water and allows the membrane to separate, therefore increasing its capability to exchange gases.
The Hamstrings are the muscles of the posterior thigh that flex the knee. The Hamstring Group consists of the semimembranosus, semitendonosus, and long head of the biceps femoris. The short head of the biceps femoris contributes to flexion of the knee but is not considered part of the Hamstring group due to its separate innervation.
Advantages:
>No cables needed.
>Multiple channels available.
>Wide bandwidth.
Disadvantages:
>Line-of-sight will be disrupted if any obstacle, such as new buildings, are in the way.
>Signal absorption by the atmosphere. Microwaves suffer from attenuation due to atmospheric conditions.
>Towers are expensive to build.
Answer:
Median height is selected
Explanation:
Stabilizing selection is a particular type of natural selection where the mean of the trait in the population stabilizes on non-extreme phenotypes, thereby favoring intermediate phenotypic variants. At genetic level, stabilizing selection is shaped by selective forces that push the distribution of the trait in the population toward the average (median trait), it is a condition that may happen when a population is completely adapted to its environment. Thus, stabilizing selection acts to purge the extreme phenotypic variants via purifying selection. Stabilizing selection is considered to be one of the most important mechanisms controlling the distribution of different phenotypes after many cycles of artificial selection, it s for that reason that breeders believe that this type of natural selection is the most common in nature.