A vaccine puts into the body weakened/dead pathogenic material, which by itself is incapable of causing disease. How does this help to protect the body in the case of infection by a live pathogen?

Answers

Answer 1
Answer:

During the process of vaccination, an attenuated pathogen is inserted into the body the organisms. The attenuated pathogen is able to provoke the primary immune response in the body of the organism without causing any harm.

Once the primary immune response is generated, the body creates a memory in form of antibody to the pathogen. After vaccination, if the pathogen infects, the body recalls the memory and generates a secondary immune response. The intensity of the secondary immune response is much higher than the primary one, so, as soon as the pathogen enter in the body, the antibodies against it are activated and result in defeating the infection.

For a better understanding purpose, the intensity of the primary and the secondary immune response is given in the figure:

Answer 2
Answer:

Answer:

d.  a vaccine causes the secretion of antibodies which remain in blood and fight the pathogen at the time of an infection.


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The four main parts of a flower are the _____. pistil stamen receptacle inflorescence sepal petal xylem phloem
Which statement below BEST summarizes the role of the DNA molecule in cells?A) guides cell division B) protects cells from infection C) provides the instructions for making proteins D) regulates the chemical processes that provide the cell with energy

Plants exhibit phototropism because _____.long roots help plants absorb more water and nutrients
they need the Sun's energy in order to produce food
water is essential to a plant's growth
strong stems are more wind resistant

Answers

The answer is they need the Sun's energy in order to produce food

Phototropism is plant growth in a response to light. In order to survive, plants need Sun's energy. During photosynthesis, carbon dioxide and water are converted into glucose and oxygen using the energy of sunlight. To get more light, plants usually grow in the direction of light, so more light could be absorbed and used in photosynthesis. Phototropism enables plants to absorb more light and that way use Sun's energy to produce food.

Congenital hypothyroidism is most often the result of _____, or underdevelopment of the hypothyroid gland.

Answers

Answer:

Hypoplasia

Explanation:

Congenital hypothyroidism is most often the result of hypoplasia. Hypoplasia is the process of incomplete development of an organ or tissue in the body. Congenital hypothyroidism is insufficient thyroid hormone production in newborn infants. The underdevelopment of thyroid gland, occurs when the fetus is still in the womb and can be seen in everywhere from tooth enamel to the corpus callosum of the brain, heart, ovaries, various muscle groups, and other regions.

Congenital hypothyroidism is most often the result of thyroid dysgenesis or underdevelopment of the hypothyroid gland.

Congenital hypothyroidism can occasionally also be brought on by a problem with how thyroid hormone is made or by a lack of iodine during fetal development.

Genetic changes or other factors that obstruct normal thyroid gland development can lead to thyroid dysgenesis. TSH receptor gene, PAX8 gene, and NKX2-1 gene mutations are a few genetic changes linked to congenital hypothyroidism.

Mothers who do not get enough iodine, pregnant women who are exposed to radiation, and people who are exposed to certain drugs or chemicals are other causes that may cause thyroid dysgenesis.

Learn more about Congenital hypothyroidism

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What do a mushroom, a plant, and a 7th grader have incommon?

They all belong to the Animal
Kingdom.

They are all composed of one or
more cells.


They are composed solely of gases
and liquids.

They are all classified as
invertebrates.

Answers

Answer:

B.

They are all composed of one or more cells.

Explanation:

The mushroom body also grows by cell division

Plants have cells, They are eukaryotic cells

Humans are complex organisms made up of trillions of cells

How does your DNA determine whether you develop sickle cell anemia

Answers

sickle cell is a recessive trait.
that means that you have to inherit the gene from both your parents.
eg, if each of your parents has one good copy, and one defective copy of the gene, there will be a 25% chance you'll get 2 copies of the defective gene.
when that happens, before modern medicine, you'd probably die.

however, if you had 1 good copy, and 1 defective copy, then you'd not get malaria.
in a part of the world where most folks get malaria repeatedly, the benefits outweigh the problems.

thalassemia is a related genetic condition that also offers some protection against malaria, however, just as with sickle cell, if you get too much of the gene, your chances for survival are not good.

both cases are interesting results of mutation and natural selection.

Researchers are conducting a study to see if exposure to an occupational toxin leads to brain tumors. The researchers recruit 1,000 men who work at a steel factory (all of whom do not have a brain tumor in 2000) and use questionnaires as well as measuring devices to see who is exposed to the occupational toxin Airflyte. After the baseline assessment, 493 of the workers were exposed to Airflyte while the others were not. After 10 years of follow up, 308 of the workers exposed to Airflyte developed brain tumors while 77 of the men not exposed to Airflyte developed brain tumors. Set up a 2x2 table with the data given.

Answers

Answer:

Explanation:

Based on the information provided, we can set up a 2x2 table to summarize the data as follows:

| Brain Tumor | No Brain Tumor | Total

--------------------------------------------------------

Exposed to Airflyte | 308 | 185 | 493

--------------------------------------------------------

Not Exposed | 77 | 430 | 507

--------------------------------------------------------

Total | 385 | 615 | 1000

In this table, the rows represent the exposure status (exposed to Airflyte or not exposed), and the columns represent the occurrence of brain tumors (brain tumor or no brain tumor). The totals are calculated for each category.

Please note that the numbers provided in the table are based on the given data and do not reflect any statistical analysis or conclusions about the relationship between exposure to Airflyte and the development of brain tumors. Further statistical analysis, such as calculating risk ratios or conducting hypothesis tests, would be necessary to determine the strength of the association between the exposure and outcome variables.

Final answer:

A 2x2 table is set up to represent the brain tumor occurrence and non-occurrence in workers who were and were not exposed to the occupational toxin Airflyte. There were 308 cases of tumors in the exposed group and 77 in the non-exposed group. The rest did not develop tumors.

Explanation:

In conducting this study, the researchers divided the 1,000 men into two groups: those exposed to the occupational toxin Airflyte and those not exposed. By using a 2x2 table, we can clearly illustrate the results obtained after the 10-year follow up. Here's how it looks:

   With Brain Tumor Without Brain Tumor    

Exposure to Airflyte

308 493 - 308 = 185  

No Exposure to Airflyte

77 507 - 77 = 430  

This table helps to visualise the observed differences in brain tumor development among the workers who were exposed to the toxin compared to those who weren't exposed.

Learn more about Health Study Data Organization here:

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What happens to time as you travel close to the speed of light?

Answers

Time slows down. Einstein's Twin Theory states that if there were two identical twins, and one traveled in space at the speed of light while the other stayed on Earth for about 50 years, the twin in space would not have aged much, and the Earth twin would be an old man,