Answer:
Correct option is C.
Explanation:
Gram staining is a technique of separation of the bacteria based on the cell wall composition. Steps involved in gram staining are:
1) Primary stain application which is known as crystal voilet, it stains all cells purple/blue.
2) Mordant stain application which is known as iodine solution, is added, and form crystal iodine complex, all cells continue to stain blue/purple.
3) Decoloration step, in this step, we can differentiate gram negative or gram positive bacteria. So, decolorizing agent such as ethanol or acetone extracts blue color from thin walled peptidoglycan layer gram negative bacteria, and gram positive bacteria remain blue/purple because it contains thick walled peptidoglycan layer.
4) Counterstain application in this step safranin red dye stain the gram negative decolorized cells red/pink, and gram positive bacteria remain same blue.
So, if a student is performing a Gram stain of a mixed culture of both E. coli and S. aureus, and he forgets to decolorize with ethanol Both the bacteria should appear blue/purple color.
Yeah they have :) pretty sure
Answer: The Heart stage.
Explanation:
Embryonic development or embroyogenesis refers to all the process that take place after the fertilization of ovule to give rise to develped plants embryo.This occur during single or double fertilization.
There are six stages of embryonic developments and they are; the two cells stage, eight cells stage, globular stage, Heart stage, torpedo stage and maturation stage.
The Heart stage is the transition stage where cotyledons that to develop and elongate, rapid cell division occur.
The lymph is moved through the body in its own vessels making a one-way journey from the interstitial spaces to the subclavian veins at the base of the neck