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Mashcka [7]
4 years ago
10

Who was the first researcher to provide direct experimental data that supported the germ theory to explain infectious disease?

Biology
1 answer:
trapecia [35]4 years ago
8 0
While Louis Pasteur was the one that procured the germ theory of disease that explains that diseases are caused by microorganisms, the first researcher that provided direct experimental data to support the said theory is Robert Koch. 

Robert Koch developed a criteria for the causality of disease from microorganisms called the Koch's postulates. The Koch's postulates indicate that:

(1) The bacteria must be present in every case of the disease
(2) <span>The bacteria must be extracted and isolated from the host with the disease and should be directly visualized and/or grown in culture
(3) There must be a healthy experimental host that will reproduce the disease once the isolated bacteria is injected
(4) The bacteria should be recoverable from the previously healthy host

</span>
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If a jack hammer exerts a force of 125N on the concrete. What is the magnitude of the force exerted back on the Jack Hammer?
Alinara [238K]

I’m not sure of this but I think this is like a science question so check in your book it should talk about the jack hammer if not , dm !

5 0
3 years ago
Read 2 more answers
If a true-breeding blue-flowered plant was crossed with a true-breeding white-flowered plant, what phenotypic ratio would we obs
Westkost [7]

Answer:

B. 100 percent white

Explanation:

According to Mendel's law of dominance, the dominant allele of a gene masks the expression of the recessive allele in a heterozygous state. Therefore, when two pure breeding plants that differ with respect to one genetic trait are crossed, the progeny expresses only the dominant phenotype. Here, one allele should be completely dominant over the other. The allele for the white flowers is completely dominant over the allele for the blue flowers.

Let' assume that the allele "W" imparts white color to the flowers while the allele "w" gives blue color. When a true-breeding blue-flowered plant (ww) is crossed with a true-breeding white-flowered plant (WW), the progeny would be heterozygous for the dominant allele "W" and would exhibit "white color of flowers" (the dominant trait).

WW (white-flowered plant) x ww (blue-flowered plant) = Ww (white-flowered plant)

6 0
3 years ago
Which of the following soil pollutants is human-made, as opposed to naturally occurring?
stiv31 [10]

Answer:

petroleum hydrocarbons

Explanation:

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6 0
3 years ago
Who won the nobel prize for discovering the structure of dna
aniked [119]

Answer:

James Watson, Francis Crick , Maurice Wilkins and Rosalind Franklin

4 0
2 years ago
In snapdragon the gene that affects flower color has two alleles: red (R) and white (W). In heterozygous individuals, the phenot
Leya [2.2K]

Answer:

The correct answer is - 50%

Explanation:

In the heterozygous condition, there is always one allele of dominant and one allele of recessive present together and during gamete formation, they assort independently. The probability of the pink flower that is RW can be found by punnet square:

      R     W

R    RR   RW

W   RW    WW

here, out of four two cases is of heterozygous or pink flower so the ration would be 2/4 or 1/2 or 50%

6 0
3 years ago
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