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Gelneren [198K]
2 years ago
5

The host range of a virus is determined by A. whether the glycoproteins or capsid proteins on its surface recognize those of the

host cells. B. whether its nucleic acid is DNA or RNA. C. the proteins in the host's cytoplasm. D. the enzymes produced by the virus before it infects the cell E. the enzymes carried by the virus
Biology
1 answer:
Marina CMI [18]2 years ago
4 0

Answer:

A. whether the glycoproteins or capsid proteins on its surface recognize those of the host cells.

Explanation:

Virus has different surface proteins that are recognized by the receptors present on its host cell. The range of a virus is determined by the recognition of these proteins by the host cell.

The interaction between the receptor on the host cell and surface proteins on the viral capsid is important for viral genome entry in the host cell and to determine the range of the host cells.

If the surface protein of the virus is not able to bind to the receptor on any cell then the virus can not infect the cell. For example, the HIV virus infects only those cell which have CD4 receptors. So the right answer is A.

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Anton Leeuwenhoek Devised a primitive microscope to observe a sample of his tooth scrapings. How did this help contribute it to
4vir4ik [10]

Answer:

C- it help to show that some bacteria are just one cell.

Explanation:

Anton Leeuwenhoek was the first scientist who observed the presence of bacteria in his tooth scratch under the microscope made by himself. At that time there was no concept of bacteria and he named those small creatures as animalcules which were later termed as bacteria.

Leeuwenhoek during 1670s  sent the details of his experimentation on algae and bacteria to Royal Society of London.

It was due to his that primitive experiment that made the discovery of bacteria and make it known to other scientists. Therefore option C is the best option that demonstrates that bacteria are single celled organisms that are very minute. When we look at cell theory there is a postulate that shows that cell is the fundamental unit of function and structure  of all living organisms. So, the work of Anton Leeuwenhoek holds substantial importance in the formulation of cell theory.

Hope it helps!


6 0
2 years ago
Which of Hubble’s findings supported the big bang theory? Check all that apply.
Dimas [21]

Answer: All galaxies are moving further away from us due to the expansion of the universe that happened after the big bang

5 0
2 years ago
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Describe the property of water that is indicated by the data. How is this property explained by the structure of water molecules
Annette [7]
Water molecules are polar, so they form hydrogen bonds. This gives water unique properties, such as a relatively high boiling point, high specific heat, cohesion, adhesion and density.
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2 years ago
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Sweat evaporates, it is through the process of evaporation that heat is taken away from the body and into the surrounding atmosphere 
3 0
2 years ago
How is loess beneficial? It grows healthy crops. It prevents wind erosion. It protects land from waves. It decreases the slope o
Arturiano [62]

The correct answer is option A, It grows healthy crops.

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2 years ago
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