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Answer:

Explanation:

Cells need checkpoints to ensure that no error is present in the DNA or even in the cellular surroundings. It is critical that all "boxes" are checked before continuing because this ensures that no major errors are faced down the line. Cells are basic unit of life so if cells are not accurate or full of errors then tissues are affected, which affects organs, and eventually organ system and in final the whole organism. Thus, checkpoints ensure that errors are caught early and dealt with properly.

If cell did not get checked at certain phases, mistakes would go by unnoticed which could affect the whole organism (see my explaination above). Also, checkpoints ensure that cell growth is controlled (that is unwanted replication do not occur). If there are no checkpoints then cell can continue to grow and eventually uncontrolled growth of cells is referred to as cancer.

Answer:

The correct answer is - 3. three saguaro cacti, five roadrunners, and two rattlesnakes.

Explanation:

A community is a group of interacting populations, in a particular ecosystem, of different species. The group of the same species is known as the population of the ecosystem. In the desert ecosystem, there should be a different group of populations should be found that interact with one other.

Among the given options, the third list has a different kind of species present three saguaro cacti, five roadrunners, and two rattlesnakes interact with one other and depend on one other for food and energy.

Answer:

This is because Protons are moving down a concentration gradient.

Answer:

There is a basic observation that similar sequences from the same evolutionary family often adopt similar protein structures, which forms the foundation of homology modeling. So far it is the most accurate way to predict protein structure by taking its homologous structure in PDB as template.

Answer:

Hamilton County Department of Education High School Course markers 9-12, 2002-2003;  4.H.1-  Apply the concepts of forces, motion, energy, electricity, and magnetism to the study of the earth and the universe

Explanation:

hope it helps

Answer:

An environment is the correct answer

Explanation:

a biological community of interacting organisms and their physical environment

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Mark brainliest

Explanation:

Nitrogen is essential to life because it is a key component of proteins and nucleic acids. Nitrogen occurs in many forms and is continuously cycled among these forms by a variety of bacteria. Although nitrogen is abundant in the atmosphere as diatomic nitrogen gas (N2), it is extremely stable, and conversion to other forms requires a great deal of energy. Historically, the biologically available forms NO3- and NH3 have often been limited; however, current anthropogenic processes, such as fertilizer production, have greatly increased the availability of nitrogen to living organisms. The cycling of nitrogen among its many forms is a complex process that involves numerous types of bacteria and environmental conditions.

In general, the nitrogen cycle has five steps:

Nitrogen fixation (N2 to NH3/ NH4+ or NO3-)

Nitrification (NH3 to NO3-)

Assimilation (Incorporation of NH3 and NO3- into biological tissues)

Ammonification (organic nitrogen compounds to NH3)

Denitrification(NO3- to N2)

Nitrogen Fixation

Nitrogen fixation is the process by which gaseous nitrogen (N2) is converted to ammonia (NH3 or NH4+) via biological fixation or nitrate (NO3-) through high-energy physical processes. N2 is extremely stable and a great deal of energy is required to break the bonds that join the two N atoms. N2 can be converted directly into NO3- through processes that exert a tremendous amount of heat, pressure, and energy. Such processes include combustion, volcanic action, lightning discharges, and industrial means. However, a greater amount of biologically available nitrogen is naturally generated via the biological conversion of N2 to NH3/ NH4+. A small group of bacteria and cyanobacteria are capable using the enzyme nitrogenase to break the bonds among the molecular nitrogen and combine it with hydrogen.

Nitrogenase only functions in the absence of oxygen. The exclusion of oxygen is accomplished by many means. Some bacteria live beneath layers of oxygen-excluding slime on the roots of certain plants. The most important soil dwelling bacteria, Rhizobium, live in oxygen-free zones in nodules on the roots of legumes and some other woody plants. Aquatic filamentous cyanobacteria utilize oxygen-excluding cells called heterocysts.

Nitrification

Nitrification is a two-step process in which NH3/ NH4+ is converted to NO3-. First, the soil bacteria Nitrosomonas and Nitrococcus convert NH3 to NO2-, and then another soil bacterium, Nitrobacter, oxidizes NO2- to NO3-. These bacteria gain energy through these conversions, both of which require oxygen to occur.

Assimilation

Assimilation is the process by which plants and animals incorporate the NO3- and ammonia formed through nitrogen fixation and nitrification. Plants take up these forms of nitrogen through their roots, and incorporate them into plant proteins and nucleic acids. Animals are then able to utilize nitrogen from the plant tissues.

Ammonification

Assimilation produces large quantities of organic nitrogen, including proteins, amino acids, and nucleic acids. Ammonification is the conversion of organic nitrogen into ammonia. The ammonia produced by this process is excreted into the environment and is then available for either nitrification or assimilation.

Denitrification

Denitrification is the reduction of NO3- to gaseous N2 by anaerobic bacteria. This process only occurs where there is little to no oxygen, such as deep in the soil near the water table. Hence, areas such as wetlands provide a valuable place for reducing excess nitrogen levels via denitrification processes.

Common Forms of Nitrogen

The most common forms of inorganic nitrogen in the environment are diatomic nitrogen gas (N2), nitrate (NO3-), nitrite (NO2-), ammonia (NH3), and ammonium (NH4+). The species that predominate depend on the chemical, physical, and biological environment.

In aquatic environments, the presence of nitrogen as unionized ammonia (NH3) or ammonium (NH4+) is dependent on the pH and temperature.

When the pH is below 8.75, NH4+ predominates. Increases in pH signify increases in the hydroxyl ion (OH-) concentration of the water, meaning the above reaction will shift to the left in order to reach equilibrium. Above a pH of 9.75, NH3 predominates (Hem, 1985). NH3 is a more toxic to aquatic life. If biological assimilation of NH3 is not occurring at a sufficient rate, NH3 may accumulate and cause detrimental effects to aquatic life.

In soils, NH4+ ions are strongly sorbed by clay particles and organic matter, which have a net negative surface charge. In alkaline soils, NH4+ will be converted to NH3 gas, and lost to the atmosphere. Under warm growing conditions, NH4+ in the soil will be transformed to NO3- via nitrification. NO3- is very soluble, and can easily be leached from soils under wet conditions.

Answer:

C6H6 - organic compound

K - element

Cl2 - inorganic elemental molecule

SO2 -  inorganic compound

Explanation:

An organic compound contains carbon and hydrogen bonded covalently . Sometimes other atoms aside from carbon and hydrogen called heteroatoms are also found in organic compounds. C6H6 is an organic compound.

Elements are found in periodic table. They always occur in uncombined state. K is an element.

Cl2 is an inorganic elemental molecule containing two chlorine atoms bonded covalently.

SO2 is an inorganic compound composed of sulphur and oxygen bound covalently. Mnay inorganic compounds do not contain carbon

Answer:

C6H6 - organic compound

K - element

Cl2 - inorganic elemental molecule

SO2 -  inorganic compound

Explanation:

:)

Meiosis only occurs in reproductive cells, as the goal is to create haploid gametes that will be used in fertilization. Meiosis is important to, but not the same as, sexual reproduction. Meiosis is necessary for sexual reproduction to occur, as it results in the formation of gametes sperm and eggs.

Answer:

At the end of mitosis, the two daughter cells will be exact copies of the original cell. Each daughter cell will have 30 chromosomes. At the end of meiosis II, each cell (i.e., gamete) would have half the original number of chromosomes, that is, 15 chromosomes.

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Explanation:

Answer:

B. False

Explanation:

Answer:

The answer gonna be B that would be your final answer

Answer:

B. All cells are eukaryotic

Explanation:

All of the cells are eukaryotic is not a part of the cell theory.

Answer:

Hey mate......

Explanation:

This is ur answer.....

Eukaryotes usually have other membrane-bound organelles in addition to the nucleus, while prokaryotes don't.

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Answer:

Explanation:

answer is eukaryotic because proparyotic cell does not have nucleus.

Answer:

The discovery that; The age of pots ( ancient ) that was used to hold milk in ancient times is as old as the Lactase-persistence mutations

Explanation:

The discovery that best supports the hypothesis is given in the question ( The hypothesis about he evolution of the lactase-persistence trait was driven by dairying )  is that The age of pots ( ancient ) that was used to hold milk in ancient times is as old as the Lactase-persistence mutations

Answer:

the answer is a white blood cells

Answer:

The correct answer is - The hydrocarbons would become less saturated to increase the fluidity of the membrane

Explanation:

The ratio of saturated and unsaturated fatty acids or hydrocarbon chains is responsible for the membrane fluidity at cold temperatures. Cholesterol is an important part of membrane fluidity as it functions as a buffer, it inserts in phospholipids to preventing lower temperatures from inhibiting fluidity and at higher temperatures stabilizes the cell membrane and increase melting point and prevent increasing fluidity.

Moving from high temperature to low temperature hydrocarbon chains become less saturated in order to increase fluidity as it inserts cholesterols into phospholipids and decrease saturation.

Answer:

birth rate,death rate, immigration and emigration

Answer:

It is the adaptation to the limiting factor temperature.

Explanation:

The presence of long ears is the most astonishing characteristic of jackrabbits. These long ears are the jackrabbits' adaptation to their native desert habitat, which helps them to cool down the temperature of their body. The ears allowed them to do so as they are thin and possess an extensive mass of blood vessels. When the temperature of the desert becomes hard to hands, the long ears of jackrabbits allow them to enhance the flow of blood via the ears by dilating its blood vessels. This dilation helps to deflect heat from the body and thus cools the creature.

Answer:

pretty sure it's magna

Explanation:

tell me if I'm wrong I hope you get a good grade (

✿^‿^)

Answer:

a)magmabecause the magma cools and rocks form

One biotic factor that affects consumers in an ocean ecosystem is Salt content.

The mother and fetus undergo a change throughout the second trimester. Typically, you'll start feeling better and displaying the pregnancy more.

The fetus has completed the development of all of its organs and systems and is about to start expanding in size.

The umbilical cord continues to thicken as it supplies the fetus with nutrients during the second trimester. However, dangerous substances can also transfer from the mother to the fetus through the umbilical cord, so caution should be taken to stay away from known dangers like alcohol and tobacco.

Therefore, One biotic factor that affects consumers in an ocean ecosystem is Salt content.

To learn more about salt content, refer to the link:

https://brainly.com/question/503189

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Answer:

I think B

Explanation:

I think B

Sorry if I am wrong.

Answer:

a. air temperature

Explanation:

took test and got right :)

Answer:

The harshest impact would be a minor decrease in salmon population.

Explanation: Since shrimp would not die out completely neither woild the salmon.

Answer:

Shifting to a healthy diet is not only good for us, but it also saves a lot of fresh water, according to a new study. Compared to existing diets, the water required to produce our food could be reduced by up to 55 percent for healthy pescetarian and vegetarian diets.

Explanation:

Answer:

The answer is : A

I believe it's biology and biochemistry.