Its the moon its a natural satellite and also reflects light
Answer:
IN GRAMS stain bacteria having blue /purple colour are <u>GRAM positive</u><u> </u>bacteria.
Explanation:
GRAM staining is the technique to differentiate bacteria on the basis of stain. In this procedure bacterial cells with blue/purple colour are Gram positive and cells with pink colour are Gram negative.
PROCEDURE
- In the first step cells are stained with crystal violet dye which is blue in color.
- Then Grams iodine solution is added, it forms a complex between dye and iodine. This complex is insoluble in water.
- Next step is addition of ethyl alcohol as a decolorizing agent. It shrinks the peptidoglycan layer by dehydrating it. In gram negative bacteria on the treatment of alcohol this complex( crystal violet- iodine complex) comes out from the outer membrane because of thin peptidoglycan layer. Gram negative bacteria lost color and decolorized. While in Gram positive bacteria because of thick peptidoglycan ,crystal violet-iodine complex trapped in the membrane. And cells don't give violet color of dye.
- After this a counterstain safranine is used, which can not color the stained Gram positive bacteria. Gram negative decolorized bacteria stain pink with safranine.
Answer:
The correct answer will be option-C
Explanation:
The eukaryotic translation takes place in three steps that are initiation, elongation and termination.
During the initiation process, the amino-acyl tRNA carrying the methionine amino acid binds the small ribosomal subunit. This pre-initiation complex of small subunit and tRNA now gets attached to 5ʹ UTR and starts scanning mRNA to find start codon -AUG.
The pre-initiation complex when finds the start codon attaches the large subunit of ribosome and form initiation complex. The formation of the initiation complex begins the process of translation.
Thus, Option-C is the correct answer.
Chromosomes are thread-like structures located inside the nucleus of animal and plant cells. Each chromosome is made up of protein and a single molecule of deoxyribonucleic acid (DNA).
The unique structure of chromosomes keeps DNA tightly wrapped around spool- like proteins, called histones. Without this kind of packaging, DNA molecules would be too long to fit inside the cells.
DNA molecules in a single human cell if unwound from their histones and placed end to end, they would measure 6 feet in length.
Chromosomes play a key part in ensuring that DNA is accurately copied and distributed to new daughter cells as the parent cell divides to form new cells.