Answer:
All the statements about DNA recombination are true.
Explanation:
Recombination can be defined as any process in which the formation of new DNA from different molecules takes place, so that the genetic information derived from each original DNA molecule will be present in the new ones. Allows random rearrangement of genes within and between chromosomes.
It constitutes a source of genetic variability and physical exchange of segments. It has regulatory value, since it can result in the activation or inactivation of genes and is also a repair pathway.
There is general or homologous recombination, which occurs between substrates with extensive homology.
Site-specific recombination, where there is an exchange of two specific DNA sequences.
And transposition, which involves a short segment of DNA that moves from one place to another on the same or different chromosome.
1. The glutamate causes an influx of ca2+ ions into the nerve cell akin to what occurs during depolarization. However, this occurs excessively without regulation (due to excessive stimulation by the glutamate) that eventually causes nerve injury through cytotoxic edema.
2. When the ca2+ levels are lowered during stroke, then nerve cell injury would be obviated hence enabling the chances of restoration of nerve cell function. This would happen because there would be no excess calcium ions to influx when the NMDA receptors are excessively stimulated by the glutamate molecules.
In a parallel circuit, the voltage across each of the components is the same, and the total current is the sum of the currents
through each component.
If two or more components are connected in parallel they have the same potential difference (
voltage)
across their ends. The potential differences across
the components are the same in magnitude, and they also have identical
polarities. The same voltage is applicable to all circuit
components connected in parallel.
If each bulb is wired to the battery in a separate loop, the bulbs are said to be in parallel.
The digestive system breaks down the food we eat while the circulatory system transports the tiny particles to each cell in the body.
The products for photosynthesis are sugar (C6H12O6) + oxygen (6O2)
