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kupik [55]
3 years ago
7

The diagram shows the stages of the eukaryotic cell cycle.

Biology
2 answers:
Pavel [41]3 years ago
8 0

The right answer is interphase.

In both eukaryotic and prokaryotic cells, the interphase is the period of the cell cycle that is characterized by an increase in cell volume, the cell transcribes its genes and the chromosomes are duplicated. It can be subdivided into several phases:

* phase G1 (growth or gap), during which the cell grows and performs the functions for which it is programmed genetically: biosynthesis of proteins, etc. It is during this phase that the young, freshly divided daughter cells grow to their final size.


* phase S (of the English synthesis, because of the synthesis of new DNA molecules), during which the chromosomal material is doubled by DNA replication. This is called chromosome duplication.


* phase G2, where the cell prepares to divide into two daughter cells. At the end of this phase, each chromosome is perfectly identical to its homolog in terms of morphology and from the point of view of the genes present, but each gene is not necessarily identical to its homologue, since generally several alleles exist.


** There is also the G0 phase, which is one of reproductive senescence. It is a possible exit from the control point at the end of G1, an alternative to the continuation of the G1 phase and the transition to the S phase. The G0 phase can be temporary or permanent and it is often induced by unfavorable conditions.

Alona [7]3 years ago
5 0

Answer:

The correct answer would be interphase.

The cell cycle is mainly divided into two phases: mitosis (M) and interphase.

Interphase is the phase in which a cell spends most of its time. It is the phase of growth and DNA replication.  

It can be sub-divided into three stages:

  • Gap 1 (G₁) phase which is represented by letter A in the given diagram.
  • Synthesis (S) phase in which DNA replication takes place. It is represented by letter B in the given diagram.
  • Gap 2 (G₂) phase which is represented by letter C in the given diagram.

Letter D represents mitosis (M) phase in which the actual division of the cell takes place.

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3 years ago
F1 is the symbol for...?
guajiro [1.7K]

Answer:

F1 and F2 Generations

The offspring of the P generation are called the F1 (for filial, or “offspring”) generation.

3 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
A diseased cell is no longer able to produce proteins. Which cell structure is most likely malfunctioning?
IRINA_888 [86]

Answer:

The ribosomes

Explanation:

Ribosomes are the organelle that produce proteins within eukaryotic and prokaryotic cells- taking information from the DNA in order to produce proteins.

Other organelles may be held responsible for the lack of protein production, but in this case it is most likely the ribosome.

4 0
3 years ago
When does cell differentiation occur? Question 1 options: when cells express the same gene when cells express different genes wh
serg [7]

Answer:

The answer is when the cell express different genes.

Explanation:

Cell differentiation is the process when a cell is changed from one cell type to an other and brings more complexity to the system. A cell before differentiation possess all the genes however their expression in turned off. When some external or internal factors trigger the gene expression it starts the cell differentiation. A multicellular organism undergoes several rounds of cell differentiation during its development. Although cell differentiation changes the size, shape and metabolic activity but the genetic makeup or DNA is never changed during cell differentiation.

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