Answer:
Because the leading strand is synthesized continuously while the lagging strand is discontinuously synthesized.
Explanation:
Two DNA strands have opposite polarity, that is, the 5' end of one strand lies opposite to the 3' end of the other strand. However, DNA replication can occur in 5' to 3' direction only since the formation of phosphodiester bonds require the presence of nucleophile 3' OH to attack the 5' phosphate of an incoming deoxyribonucleotide.
The problem is solved by the synthesis of the leading strand continuously and the synthesis of the lagging strand in a discontinuous manner. Lagging strand synthesis requires the formation of primers and their elongation to form Okazaki fragments that may have few hundreds to few thousands of nucleotides. Removal of primers from Okazaki fragments is followed by joining them together to make the long lagging strand. The discontinuous replication of the lagging strand makes the replication at the leading strand ahead of it.
Explanation:
Glial cells are the cells present in both the type of nervous system in which they neither conduct electrical impulse nor generate them but they perform some other functions like support.
Astrocytes are one of the type of glial cells which are present in the central system of neurons that is in the spinal cord and the brain.
These astrocytes perform various other functions like
1. Form the blood-brain barrier as they enclose the blood capillaries in the brain preventing leakage.
2. They regulate ionic concentration around the neurons.
3. They can store and produce glucose from the non-carbohydrate source.
4. They control the flow of the blood in the brain
5. They can also play a role in the formation of synapses in the neurons.
B) Traits that are dominant mask traits that are recessive
:)
Scientist best apply Critical thinking in their work through Observation, Hypothesis and Experimentation. Some people might say Scientific method. But Observation, hypothesis and experimentation are actually the steps in a Scientific method. So it doesn't count.