Answer:
Gram staining procedure is used to differentiate between the gram-positive and gram-negative bacteria. various reagents used in the gram staining are crystal-violet, iodine, ethanol, and safranin.
1. First, the primary strain that is crystal violet is used to stain the bacterial cells present present on the slide.
2. Then the iodine solution is added over the bacterial culture and held for 1 minute. Iodine makes a complex with the crystal violet in the cell wall of bacteria.
3. Then acetone is used as a decolorizer that decolorizes the gram-negative bacteria by dissolving its lipopolysaccharide cell wall but do not decolorize gram-positive bacteria because its cell wall is made up of peptidoglycan layer.
4. The last reagent is safranin which is used to stain decolorized gram-negative cells pink. Therefore the correct order of staining is:
Crystal violet→Iodine→acetone→sefranine
<span>D) composed of one or more eukaryotic cells</span>
Your answer should be “D”.
i hope i could help!
Correct answer: C). Thymine
The thymine, which is present in the DNA is replaced by the uracil in the RNA. Uracil is one of the four nitrogenous bases which are found in the RNA. The nitrogenous bases present in the RNA are adenine, guanine, uracil, and cytosine. While the nitrogenous bases found in DNA are Adenine, guanine, thymine, and cytosine.
Hence, thymine is the nitrogenous bases which are not found in RNA.
Classification: Oxygen is a chalcogen and a nonmetal
Color: colorless
Atomic weight: 15.9994
State: gas
Melting point: -218.3 oC, 54.8 K
Boiling point: -182.9 oC, 90.2 K
Electrons: 8
Protons: 8
Neutrons in most abundant isotope: 8
Electron shells: 2,6
Electron configuration: 1s2 2s2 2p4
Density @ 20oC:
