DNA replication is the process in which a new DNA strand is synthesised from the existing DNA strand using that as the template.
DNA strands are built from building blocks of units called nucleotides, DNA exists as a double helix which means that two complementary strands are wound around each other and bonded by hydrogen bonds between the nitrogenous bases in the nucleotides.
1. replication begins when the DNA double helix unwinds
DNA helicase breaks the Hydrogen bonds keeping the two strands together and unwinds the helix so that the two strands are exposed for replication to be initiated.
2 . the nitrogenous bases pull apart from each other at a distance, exposing the two strands
The two strands pull apart from each other so that the strands are exposed for them to be used as templates in synthesising the new strands
3. as the double helix continues to open, new nitrogenous bases are added on both sides
nucleotides consist of nitrogenous bases, phosphate group and pentose sugar. the uniqueness of DNA strands are in the sequence of nucleotides. the bases added to the new strand are complementary bases to that already in the template strand
Horses sleep while standing, unless it is necessary for them to get REM sleep. The amount of REM sleep needed is not much, so they will spend most of their time when sleeping, standing.
The function of phosphorus in plants is very important. It helps a plant convert other nutrients into usable building blocks with which to grow. Phosphorus is one of the main three nutrients most commonly found in fertilizers and is the “P” in the NPK balance that is listed on fertilizers.
Generalist species are adapt to live in a wider range of environment conditions. Specialist species are adapt to live in a narrow range of environment conditions. Thus, specialists are in a greater danger if some of the conditions in the environment change. For example, species A and B live in a river with an average temperature of 17°C. Species A is the generalist species and it can survive water temperature of 5-35°C. Species B is the specialist species and can survive water temperature of 15-20°C. If the temperature of the river decrease to 10°C, specialist species B will not survive but generalist species a will survive.
Answer:
D
Explanation:
1. As given, the overall genome contain 50% G+C.
And the concept is that G is always pairs with C.
and A is always pairs with T.
So, in a dsDNA, A+G= T+C
2. As there that, there is a cluster of genes comprising about 20,000 bp that is 64% G + C so this so that the 20,000 bp segment is a recent acquisition via horizontal gene transfer.