What is the name for the waves of contractions that propel substances along a tract?

1 answer:

5 0

Peristalsis is the name for the waves of contractions that propel substance s along a tract. It is a series of wave-like contractions that moves food to different processing stations in the gastrointestinal tract and starts in the esophagus when the boluses of food are swallowed. The wave motion is produced by the longitudinal smooth muscles that line up the esophagus, stomach, small intestines and the colon and is triggered by presence of food.

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If you wrote a brief essay discussing the impact of recombinant DNA technology on genetics as we perceive the discipline today,

Margaret [11]

Answer:

The correct applications are A, B, C, F, G and H.

Explanation:

The technology named Recombinant DNA Technology in the example is a technology which involves the combining process of the DNA segments. This segment then can be inserted into another living cell to replicate in there by itself or it can be added or integrated to a chromosome and then put into the cell for replication. Given this ability to manipulate and replicate these modified DNA molecules, this technology can lead to;

A: can be used to give the plants an advantage over certain diseases or bugs that prevent their growth.
B: can be used to modify/isolate and understand the functions of genes.
C: can be used to swap and modify genes in the human body, giving them different abilities.
F: can be used to match the DNA samples taken from the crime scenes by trying different combinations and possibilities.
G: can be used in pharmaceutical industry, for example, making the bacterias produce insulin hormones by modifying their DNA and using this for the people with diabetes.
H: can be used in gene therapy which is a process where a person's DNA is altered and put back in their body to help them produce certain enzymes/hormones/proteins thus curing specific diseases.

I hope this answer helps.

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Which of the following is a true statement about codons?

kati45 [8]

Your answer would be A

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3 years ago

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A geochronological scale measured in Millions of Years Ago or M Y A. Mesozoic era: Triassic period, 250 to 201 MYA, first dinosa

motikmotik

Answer:

D. The first flowering plants were introduced toward the end of the Mesozoic era.

Explanation:

Following the Paleozoic Era, the Mesozoic Era or Age of Conifers began approximately 250 million years ago. This major geological era brought about the ancestors of many of the plant and animal groups still in existence today.

The Mesozoic era is marked by 3 divisions:

the Triassic Period,
the Jurassic Period,
and the Cretaceous Period.

Animals and plants slowly recovered after the mass extinction in the Permian-Triassic extinction that led to the eradication of most aquatic marine species. They evolved to exploit varying niches in their environment, leading to a boom in terrestrial animals. Over time the planet's increasingly warm climate, abundant in atmospheric oxygen and carbon dioxide, contributed to the growth of diverse megaflora, that rapidly dominated the planet's terrestrial biosphere.

By the end of the Mesozoic Era, in the Cretaceous period, flowering plants (angiosperms) largely replaced the dominant seed ferns of the Triassic, and the conifers, cycads and gymnosperms of the Jurassic.

Varied dispersal mechanisms in angiosperms co-evolved with the evolution of certain types of fauna. Plants used animal life, including herbivorous reptiles and early mammal-like species to disperse large seeds.