Answer:
Gram positive cells retains purple stains of crystal violet, gram-negative cells takes up red or pink stain of safranin
Explanation:
Gram staining is a simple method of distinguishing between Gram-positive cells and Gram-negative cells. The method make use of the following steps
Heat fix cells on a glass slide and then:
1. Stain cell with crystal violet for 1 min
2. Rinse with water
3. Decolourize with alcohol for 30 seconds and wash with water
4. flood cells with iodine as mordant
5. Flush with water
6. Counterstain with safranin for 1 min and wash with water
7. View under the microscope
Gram-positive cell possesses a thick peptidoglycan in its cell wall which helps retain the purple colour of the crystal violet, While Gram-negative cells will loose out this colour when flushed with alcohol but takes up the red or pink colour when stained with safranin.
Answer:
Technology
Explanation:
Please help with my last question on my profile
Answer:
convergent is your answer
The electromagnetic spectrum is made up of seven types of waves, they are: radio, microwave, infra red, visible lights, ultraviolet, X ray and gamma ray. The electromagnetic waves have both electric and magnetic properties and they can travel through vacuum. The waves have different properties and diverse uses.
The part of the electromagnetic spectrum that can penetrate all human skin and soft tissues is X RAY. X ray have short wavelength and it can penetrate soft tissues such as skin and muscles. Because of this property, it is typically used in the health care system to take X ray pictures of bones; the pictures help the health care providers in their diagnosis.
Answer:
About 100 earthquakes per year are strong enough to cause damage.
Most earthquakes are not strong enough to be felt by humans
Explanation:
Earthquakes happen very frequently because the earth’s tectonic plates are always on the move (though just a few inches per year) and they collide or brush against each other causing stress that is released regularly as earthquakes. Close to a million earth tremors that are undetectable to humans occur every year. These are 2.4 Ritcher and less in magnitude. However, every year there are about 100 earthquakes above 6.0 Ritcher in magnitude that cause damage.