CELL DIVISION
THE CELL CYCLE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
A living infectious agent that replicates only inside the cells of an organism.
|
|
|
A non-living infectious agent that replicates only inside the cells of an organism.
|
|
|
A disorder of structure or function in a human, animal, or plant, especially one that produces specific signs or symptoms or that affects a specific location and is not simply a direct result of physical injury.
|
|
|
An organism that lives in or on an organism of another species (its host) and benefits by deriving nutrients at the other’s expense.
|
Detailed explanation-1: -A virus is an infectious agent that can only replicate within a host organism. Viruses can infect a variety of living organisms, including bacteria, plants, and animals. Viruses are so small that a microscope is necessary to visualize them, and they have a very simple structure.
Detailed explanation-2: -Viruses are not living things. Viruses are complicated assemblies of molecules, including proteins, nucleic acids, lipids, and carbohydrates, but on their own they can do nothing until they enter a living cell. Without cells, viruses would not be able to multiply. Therefore, viruses are not living things.
Detailed explanation-3: -Living things have cells. Viruses do not have cells. They have a protein coat that protects their genetic material (either DNA or RNA). But they do not have a cell membrane or other organelles (for example, ribosomes or mitochondria) that cells have.
Detailed explanation-4: -A virus is a non-cellular, infectious entity composed of genetic material and protein that can only invade and reproduce within the living cells of bacteria, plants, and animals. A virus, for example, cannot replicate outside of the host cell. This is due to viruses lacking the necessary cellular machinery.
Detailed explanation-5: -Viruses are considered as something between living and non-living because they do not grow or reproduce by themselves. This makes them non-living. However, when a virus enters a living cell of an organism, it obtains energy from the host cell and starts reproducing.