Why are the contents of gastric juice so hostile to the exposed duodenal wall?

Answers

Answer 1
Answer: The gastric juice contain harsh chemicals which includes pepsin, hydrochloric acid to break down food. Gastric juice contain mucus to neutralize its acidity that can be damaging to the stomach, especially the duodenal wall. Excessive secretion of gastric juice and failure to neutralize it completely can result to ulcers in the duodenal wall.

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Why isn't mitochondrial DNA a unique identifier? a. Mitochondrial DNA is inherited through the maternal lineage.
b. All female offspring inherit their mother's mitochondria, and therefore the same mitochondrial DNA.
c. As a result, all female family members that share a maternal lineage would have the same mitochondrial DNA.
d. Mitochondrial DNA can therefore be used to confirm or eliminate a person's relationship within a maternal line, but cannot be used to identify a specific individual.
e. All offspring inherit their father's mitochondria, and therefore the same mitochondrial DNA.

Answers

Answer:

a. Mitochondrial DNA is inherited through the maternal lineage.

d. Mitochondrial DNA can therefore be used to confirm or eliminate a person's relationship within a maternal line, but cannot be used to identify a specific individual.

Explanation:

DNA is the genetic material. Nuclear DNA profiling is used to identify a person since each individual has unique DNA. Mitochondrial DNA exhibits maternal inheritance. All the offspring of a female share the same mitochondrial DNA. Therefore, all the individuals that are related by maternal lines, share the same mitochondrial DNA. The profiling of their mitochondrial DNA would not allow the identification of a person when individuals share maternal lines.

Fill in the blank: When you paddle a boat in the water. the force of your paddle will push the water which will apply an equal force back on you. There is very little resistance to this motion because there is a limited _______ force between the canoe and the surface of the water due to the smooth surface

Answers

Answer:

frictional

Explanation:

This scenario follows Newton's third law of motion which alludes to the fact that for every force or action exerted by a person on a body there is an equal and opposite reaction exerted back.

Because there is a limited frictional force (a force exerted by an object when an object moves across it) between

  • the canoe and
  • water surface (the opposite force/reaction)

Here, the paddle helps the boatman apply a force on the water, resulting in the opposite amount of force been sent back; pushing the boat forward.

What waves are part of the electromagnetic spectrum

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visible light radio waves and gamma rays

What might be some of the economic and environmental tradeoffs of producing clothes from human-made polymers, such as nylon, and polyester versus natural polymers, such as cotton?

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The price of cotton is very high, because it is a natural fiber that must be cultivated and then harvested in certain months of the year, which in itself is a disadvantage because it interrupts the continued production of textile merchandise.

The above generates a very strong economic impact, in addition the environmental impacts are what most concern since to keep this crop in good condition, the use of pesticides, fertilizers and other minerals is constantly used that greatly pollute rivers and lakes, affecting Biodiversity. Cotton is the largest consumer of water among agricultural products, which also generates a great depletion of this valuable water resource.

For the above reasons, the use of artificial polymers emerged as a more economical and environmentally friendly alternative, since sports garments are cheaper and more resistant, they can also be kept longer, they are also more resistant to wrinkles, moths and mold.

You can find more information in this link:

brainly.com/question/21491886

Answer:

Synthetic clothes are economically less expensive and lightweight compared to common traditional clothes; however, they pose difficulties for recycling

Explanation:

Polymers are compounds made of long repeating molecules, which can be classified according to their origin into natural and synthetic. Synthetic polymers include, among others, nylon (household products), polyvinyl chloride, also known as PVC (clothing), polypropylene (packaging), etc. As compared to traditional clothes made up of cotton, synthetic clothes offer significant advantages related to production costs, i.e., they can be produced in high-scale processes, and automated production is less expensive than traditional processes. However, synthetic polymers consist of long repeat chains of molecules that have very strong atomic bonds, which make difficult their degradation by decomposers (i.e., non-biodegradable in nature). The process of degradation of synthetic clothes can take up many years to break down these compounds. In addition, synthetic clothes are also pollutants because they are lost in the water when they are laundered, remaining for many years in water ecosystems.

According to the Big Bang theory of the origin of the universe, the universe has expanded from a hot dense state into a vast, cooler state. What would be considered scientific evidence supporting this theory?A) Galaxies are moving toward each other.
B) Galaxies are moving away from each other.
C) Cosmic background X-ray radiation was detected in space.
D) The existence of common elements throughout the universe.

Answers

The correct option is option B, Galaxies are moving away from each other

It was discovered by Edwin Hubble in 1920, that galaxies are moving away from each other in proportion to the distance between them. The greater the distance at which a galaxy  exists, the faster is the distance with which it is moving away. Hubble established the Hubble’s constant which establishes expansion rate which is also helpful in determining the age and size of the universe.

What would happen if cytokinesis took place before mitosis?

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If cytokinesis happened first, the chromosomes would not have replicated and the resulting daughter cells wont be the correct ploidy