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Yanka [14]
3 years ago
5

A secondary immune response occurs when an antigen is encountered on a second occasion, due to exposure to a pathogen that previ

ously caused infection. Which property of some viruses explains the lack of a secondary immune response
Chemistry
2 answers:
Anuta_ua [19.1K]3 years ago
3 0

Answer:

Viruses could have a high mutation rate

Explanation:

Viruses replicate very fast when they enter into the bloodstream. This isn’t however the real cause of why a secondary immune system isn’t possible against them.

The main cause is because they mutate rapidly. The immune system already has an idea of the genetic composition of the pathogen exposed to previously and knows how to fight it. But the viruses undergoes some genetic alterations which then makes it hard for the secondary immune response to attack and kill them.

Kamila [148]3 years ago
3 0

Answer: The ability of virus to undergo rapid mutation.

Explanation: Secondary immune response is initiated when a particular antigen attack the same host again. In secondary immune response organism attacked has previous knowledge of the virus and how to work against the virus but when virus mutates, that is, change in genetic makeup, the organism will not show secondary immune response since there is change already and the previous knowledge about the virus is no longer applicable. Also this doesn't make the organism not to have secondary immune response but the rapid virus mutation discard secondary immune response system.

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The way in which light moves through objects is related to the type of material from which the object is made
adelina 88 [10]

Answer: True

Explanation:

The speed of light in a material medium depends on its molecular structure, in particular its electromagnetic properties, electrical and magnetic permeability. These properties may have different values for different wavelengths or frequencies of the incident light.

In this way,<u> the speed of light depends on the medium and reaches its maximum value in a vacuum</u>, so that, it will be lower in a material medium . In the vacuum (or in the air) the speed of light is 3 x 10⁸ m / s and in any other medium its value is lower.

<u>To characterize the particularities of the propagation of light in the media</u>, the refractive index is introduced ,

n = c / v  

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6 0
4 years ago
What is the density of an object having a mass of 16 g and a volume of 30 mL ?
Marizza181 [45]

Answer:

12

Explanation:

7 0
3 years ago
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What is the difference between the spectrum of hydrogen and the spectrum of sunlight
g100num [7]

Answer:

The hydrogen spectrum is an important piece of evidence to show the quantized electronic structure of an atom. ... It results in the emission of electromagnetic radiation initiated by the energetically excited hydrogen atoms. The hydrogen emission spectrum comprises radiation of discrete frequencies.

The spectrum starts with red light, with a wavelength of 700 nanometers (7,000 angstroms), at the top. ... It spans the range of visible light colours, including orange and yellow and green, and ends at the bottom with blue and violet colours with a wavelength of 400 nm (4,000 angstroms).

Explanation:

Hydrogen molecules are first broken up into hydrogen atoms (hence the atomic hydrogen emission spectrum) and electrons are then promoted into higher energy levels. Suppose a particular electron is excited into the third energy level. It would tend to lose energy again by falling back down to a lower level.

The spectrum of the Sun appears as a continuous spectrum and is frequently represented as shown below. This type of spectrum is called an emission spectrum because what you are seeing is the direct radiation emitted by the source.

6 0
4 years ago
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QveST [7]

Answer:

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Explanation:

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3 0
3 years ago
Will give brainliest!!
Nikolay [14]

Answer: True.

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4 0
2 years ago
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