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19.3 Phylogeny -- Part 4
Pick the best answer for the question.
There is a class below the level of family.
The dates of divergence are always given.
Descendants are given rise to by common ancestors.
The discovery of common ancestors in the fossil record helps scientists classify organisms.
Some plant taxonomists believe that the traditional way of classifying flowering plants is not correct, and that they need to be completely reclassified.
It would be foolish to ignore the historical classification groups according to other botanists.
Keep traditional classification schemes.
The classification of Chimpanzees and Humans has been changed because of the similarity of their genomes and the differences between them.
Humans and Chimpanzees are placed in the same family.
They are in a category that is rarely used.
Tell us why you prefer one method over the other.
It's richly populated because it includes the viruses, the prokaryoticbacteria and archaea, and the eukaryotic protists and fungi.
These organisms can be found anywhere from the highest mountain peaks to the deepest ocean trenches.
We use microbes in many ways, even though some cause diseases in plants and animals.
Gene cloning and genetic engineering, making foods and antibiotics, and disposing of sewage and environmental pollutants can all be accomplished by the help ofbacteria.
The biosphere is dependent on the services of organisms.
Plants can absorb all the nutrition they need because their roots are covered with friendly fungi.
Some protists are the producers of food in the oceans because they put oxygen in the atmosphere.
Microbes are our ancestors.
Even though we can't see the organisms without a microscope, this unit talks about them.
Take a few moments to review the discussions before you start this chapter.
The workers are trying to stop the spread of the disease.
It is believed that a 1-year-old boy contracted the disease while playing near a tree that housed a species of bat that is known to carry the virus.
The outbreak became the largest in history as it spread to other countries and cases were recorded in Nigeria, Africa.
According to the CDC, there have been over 11,000 confirmed deaths from the disease in West Africa.
The complete toll from this outbreak may never be known because most agencies believe the numbers are underestimates.
The fear of the disease is that it belongs to a family of viruses that cause a disease that targets several different cell types in the body, including the immune system and the blood vessels.
Most deaths are due to fluid loss, organ failure, or an overall failure of the immune system, not the disease that causes widespread bleeding.
The virus can be transmitted by direct contact with a person's body fluids.
There are many myths about the Ebola virus.
You can get the disease from contact with cats and dogs, antibiotics are an effective treatment, and the virus is airborne.
In order to make more copies of itself, it must invade specific cells of the body and hijack the cell's metabolism.
We will look at viruses along with other members of the microbial world.
The basic structures of a virus can be identified.
There is a Page 354 number of plant, animal, and human diseases.
The mere mention of the term brings to mind diseases such as AIDS, as well as diseases that used to be common in childhood.
It is estimated that the average person catches a cold several times a year because of the viral diseases.
Viruses are a mystery.
The ability to evolve and replicate is one of the characteristics of living organisms.
They do not have a metabolism, they do not respond to stimuli, and they use the metabolism of a host cell to replicate.
It is difficult to study the history of Viruses because they do not fossilize.
There are a number of hypotheses regarding their origin and evolution.
Hypotheses about the origin of life suggest that the two organic molecule present in viruses were the first to evolve.
It is possible that living cells and viruses came from the same place at the same time.
An alternative hypothesis suggests that the viruses came from living cells.
Tobacco mosaic disease, which causes damage to the leaves and fruit of tobacco plants, was studied by a Russian microbiologist in 1892.
He noticed that an infective extract still caused disease even after it was removed from a fine-pore porcelain filter.
Pasteur believed that the disease-causing agent was smaller than any known one.
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