The connective tissue cells that are involved with allergic
reactions of which causes release of histamine and to promote the cause of
inflammation is the mast cells. The mast cells are the type of cell in the
connective tissue that contains basophil granules and they are responsible of
promoting allergic reactions.
<span> shifts in the Earth's crust, earthquakes</span>
Answer:
D) can reveal alterations in chromosome number.
Explanation:
The karyotype is used to look for abnormal numbers or structures of chromosomes.
Karyotypes are prepared using standardized staining procedures that reveal characteristic structural features for each chromosome.
Answer:
The following step is to sterilize the wire loop, turn the plate 90 degrees, collect some organisms from the first area and continue to streak on the second area. Repeat for the third area.
Explanation:
The goal of three-phase streak is to obtain <u>isolated colonies</u> in the plate. To do this, the culture is diluted by spreading it through the entire plate.
In the <em>first phase</em>, one third of the plate is used to streak the initial <u>inoculum</u><u> </u>in a zig-zag motion. As the wire spreads, the densitiy of organisms diminishes and colonies start to be further apart. Doing this only one time, is usually not enough to obtain isolated or separated colonies. So two more phases are used.
Before the <em>second phase</em>, the wire is sterilized, and colonies are collected by passing through the first area two or three times, so the inoculum now is much smaller than at the beginning. The organisms are spread in the second third of the plate, also in a zig-zag motion.
The same process is repeated in the <em>third phase, </em>by filling the remaining area of the plate.
By doing this, it is very probable that the initial culture is diluted enough to obtain single, isolated colonies in the plate which can then be grown separately in order to identify them.