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schepotkina [342]
3 years ago
6

A structure that is found in a plant cell and not in an animal cell is a ?

Biology
2 answers:
Phoenix [80]3 years ago
8 0

A structure that is found in a plant cell and not in an animal cell is a central vacuole.

Option A

<u>Explanation</u>:

Plant cells are different from animal cells because a large central vacuole is present in the plant cell which is filled with water and salts to create a turgor pressure which gives the cell the physical strength to overcome the water pressure. The central vacuoles are not present in the animal cells but there are small vesicles which transports the molecules from surface to cytoplasm or vice versa.

Karolina [17]3 years ago
5 0
It would be a central vacuole
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3 years ago
Hypertrophy may occur as the result of normal physiologic or abnormal pathologic conditions. The increase in muscle mass associa
sasho [114]

Answer:

Compensatory hypertrophy is an increase in size of an organ or tissue after the organs and tissues are either damaged, removed, or cease to function.

Explanation:

Hypertrophy is the term used to describe an increase in cell size. If the enough number of cells in some organ hypertrophy, the whole organ will also  hypertrophy.

Compensatory hypertrophy is an increase in size of an organ or tissue after the organs and tissues are either damaged, removed, or cease to function. It can take place in a number of human organs and tissues such as the liver, the kidneys, the heart, the spleen, the lungs, the pancreas etc.

7 0
3 years ago
Write a 600 word report discussing nuclear reactors. The report should include a description of the way a reactor works and the
barxatty [35]

Answer:

Explanation:

A nuclear reactor is an installation capable of initiating, maintaining and controlling the chain fission reactions that take place in the reactor core, consisting of the fuel, coolant, control elements, structural materials and moderator in the case of nuclear thermal reactors.

The core is the part of the reactor where the nuclear chain reaction is produced and maintained.

Components of the core:

The fuel of a nuclear reactor is fissionable material.

Control rod beams provide a rapid means of controlling the nuclear reaction, allowing rapid changes in reactor power and eventual shutdown in case of emergency.

The neutrons produced in fission have a high energy in the form of velocity. Their speed should be reduced to increase the probability of other atoms fissioning and not to stop the chain reaction. This is achieved by elastic collisions of the neutrons with the nuclei of the moderator.

Most of the energy released by fission is in the form of heat. To be able to use this, a refrigerant must pass through the interior of the reactor that absorbs and transports this heat.

In a nuclear chain reaction, a certain number of neutrons tend to escape from the region where it is produced. This neutron leakage can be minimized by the existence of a reflecting medium, thus increasing the efficiency of the reactor.

When the reactor is in operation, a large amount of radiation is generated. Protection is needed to isolate the installation workers from radiation caused by fission products. Therefore, a biological shield is placed around the reactor to intercept these emissions.

A breeder reactor is a nuclear reactor that generates more fissile material in the fuel than it consumes. Considered highly attractive because of their superior fuel economy: a normal reactor consumes less than 1% of the natural uranium that starts the fuel cycle, while a 'breeder' can burn it almost completely. It also generates less waste for the same amounts of energy. Breeders can be designed to use thorium, which is more abundant than uranium. Currently, there is renewed interest in both breeder designs due to the increased price of natural uranium.

All commercial reactors breed fuel, but they have low (though still significant) breeding ratios when compared to machines that are traditionally considered breeders. In recent years, the commercial energy industry has been emphasizing high burn fuels, which last longer in the core of the reactor.

Reproduction of fissile fuel is a common feature in reactors, but commercial reactors are not optimized for this feature which is referred to as improved burning. Up to one-third of all electricity produced in the current U.S. reactor inventory comes from reproducible fuel, and the industry is working hard to increase that percentage over time.

The advantages are:

Generates a large amount of electricity

No production of greenhouse gases

Dependence on oil is reduced

Less damage to the environment

A major disadvantage is the difficult management of the nuclear waste generated.

Nuclear power plants have a limited lifetime. The investment for the construction of a nuclear plant is very high.

4 0
3 years ago
How are most galaxies moving relative to one another? What evidence do astronomers use to support this theory?
sergij07 [2.7K]

Answer:

Galaxies rotate in their center with parts of galaxies that are far away from centre.

Explanation:

Galaxies move throughout the space. It rotates around its center with the portions of galaxy that are far from the center and moves relatively slowly from other objects near the center.

Because of the Big bang explosion because of which the Universe have expanded, galaxies are going away from other galaxies. The galaxy cluster also moves around the cluster center.

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3 years ago
Which of the following is TRUE about this reaction?
hoa [83]

The right answer is C

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Anaerobic respiration is a mechanism in which electrons pass through a chain of transporters whose final acceptor is a mineral substance other than oxygen, unlike aerobic respiration where the final acceptor is dioxygen. The final acceptor may be the nitrate ion (as in the case of Pseudomonas), carbon dioxyde or the sulfate ion.

Some bacteria (Pseudomonas) are able, anaerobically, to reduce nitrates to nitrites and then, depending on the case, to dinitrogen (with the enzyme Nitrate reductase A).

NO3- ==> NO2- ==> N2.

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