Answer:
Mature pollen grains contain two cells: a generative cell and a pollen tube cell. The generative cell is contained within the larger pollen tube cell. Upon germination, the tube cell forms the pollen tube through which the generative cell migrates to enter the ovary.
Explanation:
Explanation:
These questions are related to the extraction of DNA using detergents and ethanol.
1. Consistency and texture- the extracted DNA is white, spongy and moist or slime in nature.
2. Salt is used during the extraction process as the DNA is negatively charged molecule and to neutralize the negative charge which will allow the formation of precipitate.
3. The DNA is soluble in aqueous solution as the DNA is a negatively charged molecule therefore the negative charge makes it a polar molecule and it can form the interactions in the aqueous solution.
4. RNA could be present in the aqueous solution along with the DNA as both are the nucleic acid.
5. The base-pairing rule was suggested by the Chargaff who proposed that Adenine binds thymine and guanine binds cytosine.
5. The binding of adenine to thymine involves two hydrogen bonds and between guanine to cytosine involves three hydrogen bonds.
Answer:
Based on the flow of energy form the lower order to the higher order will e more in a biological diverse ecosystem.
Explanation:
- An ecologist looking at the lush green ecosystem with different types of trees and plants suggests that its a healthy vegetation and thus has a high level of biodiversity.
- Due to the abundance availability of a good amount of sunlight, and water and rich quality of soil form the terms of producers and form the consumers i.e herbivorous animals the high quality of grass and green leaves to feed on.
- This would lead to high growth and development of the herbivorous animal. And similar for the carnivorous animals would get a good amount of prey.
Answer:
yes, because parasitism helps only one organism and hurts the other. we get poisoned, they get fed
