Answer:
The correct answer is d.) they have a negative charge
Hydroxide ions, chemical formula OH⁻ are negatively charged anions.
Oxygen is covalently attached with hydrogen in hydroxide ion.
It is important as it can function as base, nucleophile, ligand as well as catalyst.
Chemicals containing hydroxide ions are considered as base. They dissociate in hydroxide ion and their respective cations in aqueous solution.
The Lewis dot structure of hydroxide ion is shown below.
The theory of evolution was created by Charles Darwin. He found that we evolve through natural selection. We survive and reproduce in order for our species to survive.
Answer:
The correct answer is OPTION B (b. Yes—the initial infection might be acute but the virus can later become latent by becoming integrated into the host cell genome).
Explanation:
The hepatitis B virus has an unusual feature similar to retroviruses. This makes it deadly and difficult to treat when it is at an advanced stage. It basically attacks the liver and can cause both an acute and persistent infection.
In the acute stage, the cells are newly attacked and the body is fighting it off, the symptoms might start showing depending on how long it has invaded the body. These symptoms include dark urine, vomiting, yellowing of the skin and eyes (jaundice), the liver can still fail at this stage causing death.
At the persistent stage, which is already chronic, the invaded cells have been weakened, the symptoms are slow to resolve therefore it is in a prolonged stage which can lead to liver cancer and eventual death.
<span>The human egg cell is the largest cell in the human body, measuring approximately 0.13 mm in diameter. Its size is 10 times the diameter and 1000 times the volume of most other human body cells. It can actually be seen without the aid of a microscope if one observes keenly. Unlike ordinary body cells which have a cell membrane, the egg has a special outer coat called zona pellucida which is made up of a jelly-like extracellular matrix composed mainly of glycoproteins.</span>
Plasma caries minerals, vitamins, sugars, and other nutrients.