Answer:
Explanation:
A Pure bacterial culture must be grown in sterile tryptophan or peptone broth for 24–48 hours before performing the test. A sterile environment helps to avoid contamination.
When a test is conducted and it shows the presence of a red or red-violet color in the surface alcohol layer it means the result is positive
But when the colour is yellow it indicate negative reaction due to glucose fermentation.
A deviation from two color may also occur when we have an orange color. This colour change is due to the presence of methyl indole
When there is no color change this indicate No decarboxylase which is an enzyme needed for the fermentation reaction.
Color changes are indicator of how successful the reaction was.
B is the correct answer because the density it the salts would make the water increase therefore sink faster
Heredity is the term use for passing of phenotypic traits from ancestors to next generation or from parents to offspring.
The process of the hereditary:
=> The offspring cell or organism acquires the characteristic of its parent cell of organism.
<span>The study of hereditary is called genetics. It is based on the DNA study of a person’s cell. Mendel’s law shows how this inheriting works </span>
<span>People may inherit physical, emotional or even health problems from their parents or ancestors.</span>
Answer:
The importance of medicinal plants in human are as follow:
- Medicinal plants are considered as a rich resource of ingredients.
- It is used in drug development either pharmacopeial and none pharmacopeial or synthetic drug.
- It has it's origin in ancient culture .
- Using medicinal plant doesn't have any side effects.
