Answer:
B. 30%T, 20%G, 20%C
Explanation:
The Chargaff rule states the relationship in DNA molecules based on nucleotide composition. It is based on the fact that in a double-helical DNA molecule, a purine base of a strand always pairs with a pyrimidine base of the other strand. According to the Chargaff rule, the number of adenine bases equals the number of thymine bases, and the number of guanines equals the number of cytosines.
According to the given information, the percentage of adenine (A) in the DNA of a particular organism is 30%. This means that the DNA of this organism would have 30% of thymine nucleotides. Out of total 100% DNA nucleotides, the proportion of guanine + cytosine nucleotides= 100- (30 + 30) = 100-60= 40.
In a double-helical DNA, the number of guanines equals the number of cytosines. Therefore, the percentage of guanine and cytosine nucleotides each= 40/2=20%
Answer:
UV intensity predicts the skin color of indigenous populations. Stronger UV radiation is correlated with darker skin color. Data suggest that variation in human skin melanin production arose as different populations adapted biologically to different solar conditions around the world.
Explanation:
Phenotypic traits of pollen would you predict to be selected upon to promote survival and fitness within an insect-pollinated flowering plant is
<u>(B) ability to produce the most cells during </u><u>mitotic growth</u><u> of the pollen tube.</u>
- In seed flora, the female reproductive organ consists of the ovule. it's far in which female reproductive cells are produced and housed. After fertilization, those cells sooner or later become a seed, which then ripens to form a complete-grown adult plant. Ovules are housed in ovaries at the base of a vase-like shape referred to as a carpel, which has an opening on the pinnacle referred to as a stigma and a neck known as a style.
- Following fertilization, the ovule starts offevolved to swell and its wall begins to thicken so that you can transform right into a seed, while the ovary begins to make bigger round it and change into the fruit. take into account that even as some plants, just like the kiwifruit, have many ovules that grow to be numerous seeds in the fruit, different flora, just like the avocado, handiest have one ovule in their ovary.
- The place of the ovules is any other manner that plants differ from one another in regard to them. Ovules are particularly discovered on the scales of lady cones in gymnosperms, consisting of conifers, whereas they're discovered in the ovary inside the carpel in angiosperms, or flowering vegetation.
Learn more about mitotic growth here:-
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<span>12 major soil orders :)
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Answer:
Abiotic factors, such as temperature, water, sunlight amounts, and regional terrain, directly effect biotic factors. Biotic factors are the living components of an ecosystem which include primary producers, consumers, and dexomposers.
Abiotic factors can effect organisms in many ways. Hey can effect primary producers negatively if there is too little sun, water, or nutrients in the soil. However, if there is too much of any one of these, they can still be negatively effected. With primary producers, it’s all about balance.
while consumers do not directly require the above conditions, they do rely on the plants and animals that feed on said plants to survive. If the plants do not have correct nutrients, they will not either. As far as terrain goes, they adapt to better cope with the environment. If they live in an aquatic enviromment for example, they acquire ways to more efficiently move through the water to look for food.
Decomposers rely on the remains of dead plants and animals in order to survive. They feed off of dead matter and the waste gets deposited into the soil. This in turn helps to give the soil its nutrients, and so the cycle continues.
Everything in nature is reliant on each other. This delicate balancing act is both beautiful and so very fragile. If one organism is removed, the entire ecosystem could suffer. This is why it is so critical to protect the environment we share with every other living creature on this earth.
