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
Answer:
The presynaptic membrane is formed by the part of the presynaptic axon terminal forming the synapse and that of the postsynaptic neuron is called the postsynaptic membrane. The space between the presynaptic and postsynaptic membrane is called the synaptic cleft. These three structures together form the synapse.
Explanation:
Answer:
Yes
Explanation:
Homologous structures or similar structural features can be a result of common ancestry. DNA comparison and analysis between the species can be used to identify the common ancestor.
Answer: A BMI(Body mass index) is the ratio for determination of the total fat of the body. It is considered ideal if the BMI value is ranging from 18.5 to 24.9
Explanation: Body mass index(BMI) defines whether the person is over weight or underweight by calculating the overall fat of the body . A range of 18.5 to 24.9 BMI value is considered to be healthy. If the value is higher than 30 then it is considered as person is obese/overweight and if the value is below 18.5 it is considered to be underweight.
