Dr. marshall demonstrated that gastric ulcers are caused by a bacterium by using Koch’s postulates.
Koch’s postulates are four standards created to confirm a causative relationship between a microorganism and a disease. Koch’s postulates were formulated in 1884 by Robert Koch and Friedrich Loeffler. Koch’s postulates include;
- the microorganism must be found in every cases of the disease.
- the microorganism must be isolated from the diseased host and grown in pure culture
.
- the cultured microorganism must cause the disease when introduced into a healthy laboratory animal
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- the microorganism must be re-isolated from the new host and identified to be the same as the original causative agent
.
Answer:
Ribosomes are macromolecular machines, found within all living cells, that perform biological protein synthesis (mRNA translation). Ribosomes link amino acids together in the order specified by the codons of messenger RNA molecules to form polypeptide chains. Ribosomes consist of two major components: the small and large ribosomal subunits. Each subunit consists of one or more ribosomal RNA molecules and many ribosomal proteins (RPs or r-proteins). The ribosomes and associated molecules are also known as the translational apparatus.
Explanation:
Declining krill populations will have catastrophic consequences for ecosystem homeostasis and it will increase the levels of phytoplankton.
<h3>What is ecosystem homeostasis?</h3>
The term ecosystem homeostasis makes reference to the state of equilibrium between different species in an ecosystem.
Krill are fundamental primary consumers in aquatic environments and they eat autotrophic phytoplankton.
In conclusion, declining krill populations will have catastrophic consequences for ecosystem homeostasis and it will increase the levels of phytoplankton.
Learn more about ecosystem homeostasis here:
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If the mRNA sequence is AUGGCAAGAAAA it means that the triplet codons are AUG GCA AGA AAA.
AUG codes for the methionine (start codon) - Met
GCA codes for the alanine – Ala
AGA codes for the arginine – Arg
AAA codes for the lysine – Lys.
Density of the animal population Animal population is the only biotic or living factor. Grazing by herbivores, like sea turtles, will affect seagrass populations. Too many herbivores, not enough segrass.