An area of land with a defined border and a sovereign government is a ​

Answer:

B. Their cells have a nucleus.

Explanation:

The primary difference between them is their cellular organization. Bacteria are single-celled microbes and are prokaryotes, which means they're single-celled organisms lacking specialized organelles. ... In contrast, protists are mostly single-celled eukaryotic organisms that are not plants, fungi, or animals.

Answer:

B. Their cells have a nucleus.

Explanation:

Protists are different from the Bacteria kingdom because, their cells have a nucleus.

Answer:

Anaerobic respiration in plants produces ethanol (C2H5OH) whose accumulation may kill the plant, whereas in animals anaerobic respiration produces lactic acid (CH3CH(OH)COOH) that however cannot cause death of animal but lead to minor muscle cramps, but they can be cured with hot water bath or a massage.

Answer:

Patagonian hares

Explanation:

Answer:

huh? wait..what?

Explanation:

Answer:

enzymes

Explanation:

The electrons removed by oxidation from glucose ultimately end up  at Electron Transport Chain, during the process of cellular respiration.

Electron Transport Chain is a series of electron transporters present on the inner membrane of the mitochondria. All the electrons from the cellular respiration end up here, where they are involved in the process of synthesizing ATP. The movement of electrons through transporters is coupled by the movement of protons across the membrane to generate a gradient.

Cellular respiration is the process of synthesizing energy by the breakdown of glucose using oxygen. It is a three pathway process. The pathways in their sequential order are: Glycolysis, Krebs Cycle and Electron Transport Chain.

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Answer:

Animal cells have centrosomes (or a pair of centrioles), and lysosomes, whereas plant cells do not. Plant cells have a cell wall, chloroplasts, plasmodesmata, and plastids used for storage, and a large central vacuole, whereas animal cells do not.

Plant cells have a cell wall, but animals cells do not. ...

Plant cells have chloroplasts, but animal cells do not. ...

Plant cells usually have one or more large vacuole(s), while animal cells have smaller vacuoles if any are present.

Animal cells each have a centrosome and lysosomes, whereas plant cells do not. Plant cells have a cell wall, chloroplasts and other specialized plastids, and a large central vacuole, whereas animal cells do not

Explanation:

hope this helps!

Answer:

D

Explanation:

Anaerobic respiration evolved first; aerobic respiration evolved after photosynthetic organisms began producing oxygen

Answer:

D

Explanation:

Anaerobic respiration evolved first; aerobic respiration evolved after photosynthetic organisms began producing oxygen

Answer:

option (C)

Explanation:

In both plants and animals, RNA contains:

Ribose sugar, phosphates, adenine, uracil, guanine, and cytosine.

The cryptogams are flowerless and seedless plants. They show hidden reproductive organs and produce spores for reproduction. Crytogams include division Thallophyta, Bryophyta and Pteridophyta.

Answer:

polycythemia

Explanation:

Answer:

Everywhere you look, the world is truly wild, in a way that's just breathtaking. What does it smell like? You wouldn't think it would be noteworthy, but the whole Serengeti smelled clean. Fresh, kind of, with just a trace of dust on the wind.Explanation:

The sentences that describe a tropical dry forest are:

A. It experiences rapid nutrient cycling.

D. It is mostly composed of deciduous trees.

A tropical deciduous forest is one that contains trees with broad leaves, dry or semi-dry trees are present. This forest has always nutrient cycling and also contains deciduous forest.

The options are attached below:

A. It experiences rapid nutrient cycling

B. It is always wet

C. it has very poor soils

D. It is mostly composed of deciduous trees

Thus, options A and D are correct regarding tropical dry forest

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Nitrogen is present in all of the options listed except for monosaccharides. Thus, correct option is (E).

A crucial component of biological compounds is nitrogen. Nitrogen is a component of proteins, nucleic acids (DNA and RNA), amino acids (which serve as the building blocks for proteins), and DNA. Amino acids, which make up proteins, contain nitrogen as a necessary part of their structure.

Adenine, cytosine, guanine, and thymine/uracil are nitrogenous bases that are essential for the operation of nucleic acids, including DNA. Monosaccharides, simple sugars and the fundamental unit of carbohydrates, do not, however, include nitrogen. Instead, the majority of their atoms are made up of carbon, hydrogen, and oxygen.

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When blood calcium levels are low, osteoclast activity increases. This means that the cells responsible for breaking down bone tissue become more active.

Osteoblast activity, on the other hand, decreases, as there is less calcium available for bone formation. Calcium absorption is also reduced, making it harder for the body to take in calcium from the diet. In response to low blood calcium levels, the hormone calcitonin is secreted, which helps to regulate calcium levels by inhibiting the breakdown of bone tissue. These processes contribute to the production of more bone tissue in order to maintain calcium homeostasis. These responses work together to maintain calcium homeostasis by increasing the availability of calcium in the bloodstream when levels are low and promoting bone remodeling to regulate calcium levels effectively .So the cells responsible for breaking down bone tissue become more active.

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Action potentials trigger voltage-gated channels in the nodes of Ranvier, which regenerate an action potential as it extends down a neuron. Voltage-gated and ligand-gated ion channels share gating mechanisms and open/closed states.

Neuron membranes carry short electrical signals called action potentials. Voltage-gated channels in the nodes of Ranvier help regenerate the signal as the action potential travels along the neuron. These myelin sheath holes are axon nodes. These nodes' voltage-gated channels rapidly depolarize the membrane, allowing the action potential to bounce between nodes in saltatory conduction. Each node regenerates the action potential to keep the signal strong.

Voltage-gated and ligand-gated ion channels share gating mechanisms and open/closed states. Both types of channels govern cell membrane ion flow by opening and closing. Voltage-gated channels are triggered by membrane potential, while ligand-gated channels by ligand binding. Ions cross the membrane and generate an electrical signal when the channel opens. Closed channels stop ion flow. Thus, these channels control nerve signal transmission.

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The answer is true. Ribosomal RNA does act as a ribozyme, catalyzing peptide bond formation in protein synthesis.

What is Ribosomal RNA?

Ribosomal nucleic acid is a non coding RNA (ribonucleic acid). They are the primary part of ribosomes that is essential to all cells. rRNA is a ribozyme. It carries out protein synthesis in ribosomes.

rRNA molecules are synthesized in a special region of cell nucleus that is called nucleolus. It is a dense area inside the nucleus containing genes coding for rRNA.

The rRNAs that are coded are different in size. They are either large or small. There is at least one large rRNA and one small rRNA in each ribosome.

The large and small rRNAs combine with ribosomal proteins to form large and small subunits of the ribosome in the nucleolus (example: in bacteria, 50S and 30S.)

Therefore, ribosomal RNA does act as a ribozyme, catalyzing peptide bond formation in protein synthesis.

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The family of cytokines that is highly associated with innate antiviral responses is the Interferon family. Therefore, the correct option is B.

An important role in innate antiviral responses is played by the interferon family of cytokines. As a protective measure, cells in the body make interferons when a viral infection is detected. Interferons act as signaling molecules that interact with nearby cells to inform them of the presence of the virus. They induce these cells to enter an antiviral state, which activates several immune defense mechanisms to thwart the reproduction of the virus. Interferons can reduce the production of viral proteins, block the virus from entering cells, and improve the way immune cells are exposed to viral antigens.

Therefore, the correct option is B.

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The properties that allow this are the carbon's four valence electrons, and the fact that they can bond with other carbon atoms.

Answer:

Your body uses water in all its cells, organs, and tissues to help regulate temperature and maintain other bodily functions. Because your body loses water through breathing, sweating, and digestion, it's important to rehydrate by drinking fluids and eating foods that contain water.

Answer:

Water is needed for your digestive track as it digests foods. As water is also needed for each cell to properly function in your body.

The following identifies a scientific question that the scientist could ask to best evaluate the effect of DDT on the bird species is: "How do increasing levels of DDT in the environment affect the survival and reproduction rates of the bird population over a ten-year period?"

This question would allow the scientist to measure the long-term impact of DDT on the bird population, including any potential changes in behavior, migration patterns, and overall health. By measuring a variety of variables over the ten-year period, such as nesting success, eggshell thickness, and chick survival, the scientist can determine if there is a correlation between DDT levels and decreased survival and reproduction rates in the bird population.

The study could also assess if the bird species is able to adapt to the presence of DDT over time, or if the negative effects become more pronounced as exposure increases. Overall, this question would provide valuable information about the impact of DDT on the environment and the species that depend on it.The following identifies a scientific question that the scientist could ask to best evaluate the effect of DDT on the bird species is: "How do increasing levels of DDT in the environment affect the survival and reproduction rates of the bird population over a ten-year period?"

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If the apple snail population were to decrease, the limpkin, a secondary consumer that eats mainly apple snails, would have to find an alternative food source in order to adapt to its environment. This could involve finding other types of snails or mollusks to eat, or potentially switching to a diet that includes other types of prey. The limpkin may also need to range over a larger area in order to locate sufficient food, or it may need to change its foraging behavior in order to more effectively locate and capture its preferred prey. Ultimately, the limpkin's ability to adapt to a decline in the apple snail population will depend on the availability of other suitable food sources and the flexibility of its foraging behavior.

Anxiety is biologically adaptive because it helps humans and other animals prepare for good and bad events.

What is Anxiety?

Anxiety is a natural human response to stress or danger, characterized by feelings of fear, apprehension, or nervousness. Anxiety is a normal part of life, and it can be helpful in preparing the body for perceived threats or challenges. However, when anxiety becomes excessive or chronic, it can interfere with daily activities and lead to negative outcomes such as impairment in social and occupational functioning, decreased quality of life, and other mental health issues.

Anxiety is a natural response to stress or perceived threat, and it can motivate individuals to take action to avoid or cope with the potential danger. It can also help individuals to focus their attention, make better decisions, and perform better in challenging situations.

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Answer:

D. Nucleotide bases

Explanation:

Hope it helps.

Nucleotide bases of the DNA contain the instructions on how to control cells.

The sequences must first be "decoded," and the protein must then be translated. It is known as protein synthesis.

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Answer: They don’t have microvili because they don’t need it.

Explanation:

Animal cells have this because it increase surface area and helps absorb food and water molecules.

Plant cells do not have microvilli because they do not require the same type of surface area enlargement as animal cells.

Microvilli are small, finger-like projections that extend from the surface of animal cells. They help to increase the surface area of the cell, which is important for functions such as absorption and secretion.

Whereas plant cells have a rigid cell wall that provides structural support and protection. They have evolved unique structures to meet their specific needs, such as chloroplasts for photosynthesis and a cell wall for support and protection.

So, the absence of microvilli in plant cells is not a disadvantage since they do not require the same surface area enlargement as animal cells.

Therefore, the absence of microvilli in plant cells is due to their unique structural and functional needs.

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Carbohydrates contain carbon, hydrogen, and oxygen in the ratio of 1:2:1. They play important roles in many biological processes, including energy storage, structural support, and cell signaling.

Carbohydrates are one of the four major classes of biomolecules, along with proteins, lipids, and nucleic acids. They are organic compounds made up of carbon, hydrogen, and oxygen atoms in the ratio of 1:2:1. This means that for every carbon atom in a carbohydrate, there are two hydrogen atoms and one oxygen atom. Carbohydrates play important roles in many biological processes, including energy storage, structural support, and cell signaling. Common examples of carbohydrates include sugars, starches, and cellulose.

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The statement "they are not regulated by contact inhibition" best describes cancer cells. Thus, the correct option is D.

A cancerous cell may be defined as a cell that stimulated continuous growth, inhibition of apoptosis, perform metastasis, etc.

Contact inhibition is performed by the noncancerous cells to cease proliferation and growth when they contact with each other. This property is lost when any noncancerous cell is transformed into a cancerous cell.

Thus, the correct option for this question is D.

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