There are four bases found in DNA: adenine (A), cytosine (C), guanine (G), and thymine (T). Adenine forms a base pair with thymine, and cytosine forms a base pair with guanine. There is a one-to-one relationship in these base pairings (Chargaff’s rule), which means that if you know the percentage of any one of them within a given DNA sample, you can calculate the percentages of the other three. In this case, you're given the percentage of guanine, and you want to find out the percentage of adenine.
Since guanine base-pairs with cytosine and since there must be as much cytosine as there is guanine, 41% of the bases in this gene are cytosine as well. That means that adenine and thymine <em>together </em>make up the remaining 18% (100% − 41% G − 41% C) of the base pairs. If there must be an equivalence in the number of thymine and adenine bases per Chargaff's rule, then half of the remaining base pairs must comprise adenine and the other half comprise thymine. Half of 18% is 9%.
Thus, adenine makes up 9% of the bases in this gene.
The supply of warm, moist air decreases.
Answer:
A) boreal forest and tundra
Explanation:
Boreal forests are present north of 50-60 degree north latitude. Tundra biomes are also called as arctic tundra and are also located in extremes of the north latitude. Boreal forests are world' largest biome and stretches across both North America and Eurasia. So, the two habitats are found at high latitudes among the given options are: boreal forest and tundra.
The answer is horizontal gene transfer.
Horizontal gene transfer enables gene flow between genomes of two organisms. It is a common process between different species of <span>prokaryotes and even, between prokaryotes and eukaryotes. </span>When trying to reconstruct evolution and phylogenetic relationship, scientists face some difficulties because they cannot say the common gene transfer with the horizontal one.
Answer: A. The gut is positioned directly above the foot
Explanation:
Gastropoda comes from two Greek words: gaster (stomach) and pod (foot). The name refers to the fact that their gut is positioned above the foot.
