Answer:
The correct option is D
Explanation:
Beta-thalassemia major is a hereditary disorder that usually causes severe anaemia. This mutation/disorder eventually leads to death if untreated especially during in the first two years of infancy. The treatment usually involves the transfusion of blood to clear the phenotypic blockage caused by the mutation. However, it requires both alleles to have the thalessemia mutation for a patient to be said to have beta-thalassemia major. Hence, <u>it is </u><u>not true</u><u> that it involves just the x allele and thus affects males more often than females</u>.
Answer:
See the answer below
Explanation:
<em>Replication is a process involving the production of daughter copy by DNA. Transcription, on the other hand, is a process during which the coding strand of DNA is used as a template for the production of mRNA - messenger RNA.</em>
During DNA replication, <u>Adenine is paired with Thymine while Guanine is paired with Cytosine</u>. During transcription, <u>Adenine's pairing is replaced with </u><u>Uracil</u> while Guanine/Cytosine pairing remains the same.
hence, the main difference between the base-pairing during both processes is the replacement of Thymine with Uracil during transcription.
Most people know that it is colder on top of a mountain compared to the ground, but few actually know why. And even less know that the atmosphere actually warms up again! The true temperature profile of the atmosphere is shown in the image.
The air at the surface up to around 10 kilometers is called the troposphere. The reason it is warmer at the surface is simple. The air is warmed by heat given off by the Earth! The farther away from the surface the air moves, the less heat there is to absorb.
From 10 to 20 kilometers the atmosphere is stable. This region is called the tropopause. From 20 to about 50 kilometers is the stratosphere. In this region the air actually warms with height! Ozone is concentrated in this part of the atmosphere and it absorbs ultraviolet light from the Sun. More light is absorbed at higher altitudes compared to the lower stratosphere, so the temperature increases.
But at 50 kilometers, the temperature levels out again in a region called the stratopause. At about 55 km, the mesosphere begins. In the mesosphere, the temperature decreases with height again, because there is very little ozone to warm up the air.
Finally, the mesopause divides the mesosphere from the thermosphere, which is the section of the atmosphere higher than 90 km. In this region, the temperature increases again! This time, it is molecular oxygen (O2) that causes the temperature increase. The oxygen absorbs light from the Sun, and since there is very little air in the thermosphere, just a little absorption can go a long way!
The following model health claims can be used in the food labeling to illustrate the association between vitamin D, calcium, and osteoporosis:
1. Sufficient vitamin D and calcium throughout life, as a component of a well-balanced diet, may minimize the threat of osteoporosis.
2. Sufficient calcium and vitamin D as a component of a healthful diet, alongside physical activity, may minimize the threat of osteoporosis in the later stages. Thus, the given statement is True.