The four nitrogenous bases found in DNA are cytosine, thymine, adenine, and deoxyribose sugar.
True false

If the producers are being removed from the food web, then there would be a decrease in consumers and decomposers. The correct option is B.

Producers, also known as autotrophs, are lifeforms that produce their own food.

They derive power from chemical compounds or the sun and use water to convert it into usable energy in the form of sugar or food. Plants are the most visible type of producer.

Producers convert water, carbon dioxide, nutrients, and sunlight into organic molecules, which are the foundation of all life on Earth.

Plants and algae plant-like lifeforms that live in water can use solar energy to produce their own food.

If producers are removed from the food web, the number of consumers and decomposers will decrease.

Thus, the correct option is B.

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Microfilaments refer to the polymers of the actin protein while microtubules comprise tubulin. Intermediate filaments consist of many proteins, on the basis of the cell type in which they are present.

Further Explanation:

The cytoskeleton is found in the cytoplasm of the cells including the archaea and bacteria. This is known to be complex and dynamic network of the interlinking protein filaments which extend from the nucleus of the cell to the membrane of the cell. Eukaryotic cells comprise of 2 main types of cytoskeleton filaments, namely, microfilaments, microtubules, and intermediate filaments.

1. Microfilaments: These comprise of long polymers of G-actin proteins which produces force. The growing terminal of the filament forces the barrier like cell membranes to produce. They provide path for myosin movement which help in affixation of microfilament and move along them. The major component of microfilaments is actin. They combine to form a polymer that continues to form actin filament. The functions include muscle contraction, cell movement, and maintenance of the cell shape.

2. Intermediate filament: These filaments are known to be stable as compared to the microfilaments and heterogeneous elements of the cytoskeleton. The main function of this is in maintenance of the cell shape by bearing the tension. These filaments is responsible to  organize the structure of  cell, serves a structural element.

3. Microtubules: These are hollow cylinders and are known to be the polymers of beta as well as alpha-tubulin. They mainly have a dynamic behavior and binds GTP for the polymerization process.  centrosome organised the microtubules. This plays a main role in axoneme of flagella and cilia, mitotic spindle, and synthesis of cell wall.

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Answer Details:

Grade: High School

Subject: Biology

Chapter: Cytoskeleton

Keywords:

Cytoskeleton , microtubules, microfilaments, intermediate filaments, actin filaments, myosin, cell function, mitotic spindle.

Answer:

50 million joules.

Explanation:

In a food chain, as the trophic level rises, the energy consumed decreases. As a result, each trophic level can only consume 10% of the energy of the previous trophic level.

With that, we can arrive at the following reasoning: The locusts are in a trophic level below the toads, which means that the toads feed on the locusts and will only consume 10% of the energy that the locusts consumed from a vegetable. If a grasshopper consumed 500 million joules, frogs will only receive 10% of that. We can find out the value of energy consumed by frogs in the following calculation:

500 million joules = 100%

X million joules = 10%

X = (500 million * 10) / 100

X = 50 million joules.

Competition could be considered a limiting factor within an ecosystem because as the populations grow, they will compete for shelter and available resources. Also, as populations become denser, the risk of disease increases.   The competition can be considered as a limiting factor within an ecosystem because there is a limited supply of resources that can be used and consumed.

Convection currents in Earth's mantle result from heat transfer from the core, causing mantle material to circulate in a pattern that drives tectonic plate movement. Hot mantle material rises, cools, and then sinks back, creating a continuous convective cycle.

The convection currents in Earth's mantle are movements of the mantle material caused by the internal heat from Earth's core. Think of it like a pot of water on the stove, where the heated water expands, becomes less dense, and rises, while cooler water sinks to replace it, setting up a continuous circulating pattern.

Inside Earth, heat is continuously transferred from the core to the mantle, causing mantle convection. Although the mantle is solid rock, it can flow very slowly over time. These mantle convection currents are the primary driving force behind the movement of tectonic plates. Underlying convection cells can push the plates apart at mid-ocean ridges, where new lithosphere forms, or cause them to converge, with one being subducted, at deep-sea trenches.

As the hot mantle material rises and reaches the surface, it moves horizontally, cools down, and eventually sinks back into the mantle, completing the cycle and forming a convection cell. This cycle is fundamental for many geological processes, including the formation and movement of tectonic plates.

Answer:

A because hydrogen has 1 proton and no neutrons yet with everything else it has over 1 and over 1 neutrons

i do flvs and A is right :)

Explanation:

Animal cells obtain nutrients and energy by consuming other organisms. The complex macromolecules from these organisms are then converted into simpler molecules through digestion and absorption. These simple molecules, along with ATP derived from the harvested energy, are then used to carry out cellular functions.

All living organisms need nutrients to survive. Animals, unlike plants, obtain their nutrients and energy by consuming other organisms. The food eaten by animals typically consists of proteins, fats, and complex carbohydrates. However, in order for animal cells to function, these macromolecules must be converted into simple molecules, such as amino acids, lipid molecules, nucleotides, and simple sugars.

This conversion process is a multi-step one that involves both digestion and absorption. In the digestion process, the food particles are broken down into smaller components by both physical, such as chewing, and chemical means. Following digestion, these broken down components are then absorbed by the body during the absorption process.

Additionally, all organisms must harvest energy from their environment and convert int into ATP (adenosine triphosphate), the main energy currency in cells, in order to carry out various cellular functions.

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If a population's per capita growth rate is 0.02 and its population is 100000000, the size of the population after 5 years is equal to 110,408,080.

The population growth rate may be defined as the process that significantly involves the annual average rate of change of population size, for a given state, country, territory, or any geographic region, during a definite time period.

According to the question,

Per capita growth rate (λ)= 0.02 = 1+0.02 = 1.02.

The initial population size is (No) = 100000000.

Time duration (Nt+5) = ?

Now, Nt+5 = (λ)^5 × No = [tex]1.02^5[/tex] × 100000000 = 110,408,080.

Therefore, if a population's per capita growth rate is 0.02 and its population is 100000000, the size of the population after 5 years is equal to 110,408,080.

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Answer:

B. The world`s food supply is slowly decreasing.

Explanation:

Since human population is getting growing little by little, and the need of meat that is necessary  to feed the population, is reducing the green areas in the world to be planted by vegetable food. Also the are needed to live, work and move is reducing this areas around the world, as humankind, we have less green areas to plant our food.

Answer:

Explanation:

A reactant is a substance that take part or begin a chemical reaction and it is consumed during the reaction to form products. Reactant is on the left of the reaction.

For examples during photosynthesis, the reactants are carbondioxide, water and sunlight that give the product glucose and oxygen.

Carbondioxide, water and sunlight start the reaction and are consumed to produce glucose and oxygen.

b and d are completely wrong, leaving a or c  

a: ADP requires energy to make ATP, even though the net gain by the release of energy from ATP is > energy required to make ATP from ADP. ATP may be considered potential energy until it is actually used as an energy source  

c: ADP has 2 phosphates and to get energy from this, more energy must be put into the system to remove a phosphate than the energy released upon the removal of the phosphate.  

ATP has 3 phosphates and to get energy from this, the 3rd phosphate can be easily removed to give this energy. ADP could be considered potential energy in that it only requires the attachment of a phosphate group to make ATP.  

to me, there isn't really a clear answer for a or c  

if i had to choose, i would go with C

Answer: Option C. Photosynthesis

Explanation:

Photosynthesis is defined as the process by which plants can make their own food in the presence of sunlight by utilizing carbon dioxide and water.

The process can be understand by the following given equation:

water + carbon dioxide -------> glucose + oxygen

Photosynthesis is the process in which radiant energy converted into chemical energy through a green pigment called chlorophyll.

The process of Photosynthesis takes place in two sequential stages light-dependent and light-independent reaction.

In light-dependent reaction chlorophyll trap light and form ATP (photophosphorylation) and NADPH.

In light-independent reaction, the product of light reaction that is ATP, used to make carbohydrates from carbon dioxide (reduction).

An animal with body parts arranged around a central point is said to have radial symmetry. Examples include sea anemones and jellyfish. This is commonly found in aquatic animals, especially those fixed to a substrate.

An animal with body parts arranged around a central point, like the spokes of a bicycle wheel, is said to have radial symmetry. Examples of organisms with this characteristic include the sea anemone or jellyfish. They are also seen in many aquatic animals, especially those that attach themselves to a base, like a rock or a boat, and feed by filtering nutrients from the water flowing around them. In contrast, bilateral symmetry is when there's only one plane through which an animal can be divided into mirror-image halves, namely a front (anterior) and back (posterior) or head and tail end. Animals with asymmetrical shapes don't possess any symmetry or pattern in their body arrangement, such as sponges.

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Answer:

The correct answer is C)

Explanation:

Answer: Vaccine

Explanation:

The weakened or dead form of pathogens that evoke immune response in the body of an organism is known as vaccine. They are used to generate the immune response against pathogens.

It contains an agent that typically resembles the disease causing microorganism, it is often made weekend or used in killed form of the pathogen that generates the same immune response as like of real disease causing microorganism.

The defense mechanism of body is prepared prior to the original exposure to disease causing microorganism.

The weakened or dead form of pathogens that evoke immune response in the body of an organism is known as vaccine. They are used to generate the immune response against pathogens.

There are many types of vaccines, such as:

Thus, option "B" is correct,  vaccine they are used to generate the immune response against pathogens.

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An example of a pandemic is the black death. Thus, the correct option is B.

A Pandemic may be defined as an upsurge of a disease that takes place over a wide geographic area in a very short period of time.

Whooping cough and smallpox are epidemic diseases that mostly occur in the region of the United States.

The situation of diabetes is the highest epidemic but it does not follow the pattern of infectious diseases. This can not spread quickly and affects many individuals at the same time.

Therefore, an example of a pandemic is the black death. Thus, the correct option is B.

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Scientific models are beneficial as they allow us to quickly make predictions and help us comprehend complex phenomena. However, they are limited due to the complexity of what they represent and might not fully portray the whole phenomenon or may only work under certain situations.

Scientific models, used in various fields of study, including physics, biology, and chemistry, are representations of complex phenomena and facilitate our understanding of them. They can be both physical or computer-based and should generally be built around a hypothesis.

One benefit of using scientific models is that they provide predictions quickly and can often yield accurate results. For instance, the electron cloud model of an atom visualizes the structure of an atom, helping us understand where electrons are likely to be located.

However, these models also come with certain limitations. The limitations of scientific models often stem from the complexity of the phenomena they represent. This complexity can make it difficult to describe the model accurately, especially when we attempt to translate these complex phenomena into everyday language. Sometimes these models only depict part of the phenomenon or work effectively in certain situations, not all.

Consequently, while models are useful tools in scientific research, their limitations should always be considered when interpreting their results.

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