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Y_Kistochka [10]
2 years ago
6

How were vaccines first discovered?

Biology
1 answer:
BlackZzzverrR [31]2 years ago
7 0

Explanation:

Vaccination is the administration of a vaccine to help the immune system develop protection from a disease. Vaccines contain a microorganism or virus in a weakened, live or killed state, or proteins or toxins from the organism. In stimulating the body's adaptive immunity, they help prevent sickness from an infectious disease. When a sufficiently large percentage of a population has been vaccinated, herd immunity results. Herd immunity protects those who may be immunocompromised and cannot get a vaccine because even a weakened version would harm them.[1] The effectiveness of vaccination has been widely studied and verified.[2][3][4] Vaccination is the most effective method of preventing infectious diseases;[5][6][7][8] widespread immunity due to vaccination is largely responsible for the worldwide eradication of smallpox and the elimination of diseases such as polio and tetanus from much of the world.

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The electrons of photosystem I A. attach to water molecules during the light reaction. B. produce molecules of oxygen that enter
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Answer:d.are eventually replaced by electrons from photosytem 11

Explanation:there are two photosystems in the photosynthetic process.PSI and PS II. PS I has a reaction center called P700 because it's chlorophyll has a maximum absorption of 700nm wavelength.PSII has a reaction center called P680nm for similar reason.when an excited electron is transferred to P700,it becomes excited.this electron is passed down from from acceptor to another, until it is used to reduce NADP+ to NADPH.this electron is replaced when P680 gets excited by a photo of light and splits water to release electrons , protons and Oxygen

7 0
3 years ago
Pretend you are a biologist analyzing mutations occurring in the dna of an endangered species. in three to five sentences, descr
Snowcat [4.5K]

An adaptive mutation is a beneficial mutation that may confer an adaptive advantage to the species.

<h3>What is a mutation?</h3>

A mutation is any modification in the genetic material (DNA sequence) or genome in the cells of an organism.

Mutations can be beneficial, detrimental or neutral according to their position in the genome and the environment in which the organism lives.

In conclusion, an adaptive mutation is a beneficial mutation that may confer an adaptive advantage to the species.

Learn more about mutations here:

brainly.com/question/17031191

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6 0
2 years ago
In working with Drosophila it is common to use a balancer stock to maintain mutations of interest. The balancer chromosomes are
spin [16.1K]

The inversion would suppress recombination.

In Drosophila, the mutations which are recessive are lethal or recessive sterile. Balancer chromosomes are used to hold the deleterious mutations in stable shares as well as to save you recombination with the aid of suppressing.

Chromosomal inversions prevent the recuperation of recombinant chromosomes in ways.

  • the crossovers do now not shape within the location of inversion breakpoints, due to the fact synapsis is inhibited.
  • unmarried crossovers' inner inversions result in aneuploid gametes that cannot give upward push to normal progeny.

Drosophila is a genus of flies, belonging to the own family Drosophilidae, whose participants are often referred to as "small fruit flies" or (much less regularly) pomace flies, vinegar flies, or wine flies, a connection with the feature of many species to linger around overripe or rotting fruit.

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6 0
1 year ago
A person infected with the human immunodeficiency virus may have any symptoms for a period of time. During this period, the viru
podryga [215]

Answer:

It effects the body by causing symptoms like muscle aches, low-grade fever, headaches, sometimes rashes, swelling of the lymph glands may also occur, and flu-like illness. These are symptoms after a few weeks of being infected.

5 0
3 years ago
The breakdown of food via enzymatic reactions is known as __________.
r-ruslan [8.4K]
I believe you're looking for "chemical digestion".

Chemical digestions is where food that we ate is digested into simpler and soluble molecules that can be absorbed by our body. Enzymes are used as a catalyst to speed up the reaction.

One example is the digestion of lipids. Enzyme named lipase is used to speed up the digestion of lipids into 3 fatty acid molecules and 1 glycerol. This way, our body can absorb these simple molecules, and use them in order to make our body function.

On the other hand, physical digestion does not include enzymes, such as chewing in our mouth, therefore, don't mix them up!
4 0
3 years ago
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