Which of the following statements about staining specimens for microscopy is CORRECT?Choose all that apply  Group of answer choicesDifferential stains make it possible to distinguish between different microorganisms or to identify structures like spores.Specimens are coated in heavy metals like gold for scanning electron microscopyIt is important to stain specimens for phase contrast microscopy in order to improve the contrastHeavy metals such as osmium, lead and uranium are used in cryogenic electron microscopy and transmission electron microscopy

The correct statements about staining specimens for microscopy are:

1. Differential stains make it possible to distinguish between different microorganisms or to identify structures like spores. This is true because differential stains, such as Gram stain or acid-fast stain, use different colors to distinguish between different types of organisms or structures based on their chemical or structural properties.

2. Specimens are coated in heavy metals like gold for scanning electron microscopy. This is true because the heavy metals create a high-contrast image by deflecting the electron beam in the microscope.

3. Heavy metals such as osmium, lead and uranium are used in cryogenic electron microscopy and transmission electron microscopy. These heavy metals are used as stains in these types of electron microscopy to enhance the contrast of the image.

The statement that it is important to stain specimens for phase contrast microscopy in order to improve the contrast is not correct. Phase contrast microscopy is a type of light microscopy that enhances contrast in unstained specimens by exploiting differences in refractive index and thickness of different parts of the specimen. Therefore, staining is not necessary for phase contrast microscopy.

The correct statements about staining specimens for microscopy are:

1. Differential stains make it possible to distinguish between different microorganisms or to identify structures like spores. This is true because differential stains, such as the Gram stain, are used to differentiate between different types of bacteria based on their cell wall structure.

2. Specimens are coated in heavy metals like gold for scanning electron microscopy. This is true because the heavy metals create a high contrast image by deflecting the electron beam in the microscope.

3. Heavy metals such as osmium, lead and uranium are used in cryogenic electron microscopy and transmission electron microscopy. These heavy metals are used as stains in electron microscopy to increase the contrast of the image.

The statement that it is important to stain specimens for phase contrast microscopy in order to improve the contrast is not correct. Phase contrast microscopy does not require staining because it works by enhancing