All atoms of the same element must have the same number of
protons.
neutrons.
compounds.
electrons.

An ames test, bacteria that start producing histidines are called revertants is True.

In an Ames test, bacteria that start producing histidines are indeed called revertants. Revertants are mutant bacteria that regain the ability to synthesize histidine due to a reversion of the original mutation. This is a key principle of the Ames test, a widely used bacterial mutagenicity assay that detects potential mutagens by measuring their ability to induce mutations in the histidine biosynthesis pathway of bacteria.

By observing the appearance of revertants, which are able to grow in histidine-deficient media, researchers can assess the mutagenic potential of a test substance. The number of revertant colonies formed is compared to a negative control to determine the mutagenicity of the substance being tested.

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Answer:

Rabbits have extremely long and strong hind limbs (that is to say, rear legs). This adaptation allows them to hop very quickly and very far.

Rabbits can run quickly, as well. In fact, the average rabbit can run between 25 and 45 miles per hour. Not only are rabbits fast, but they can quickly change the direction in which they're running in order to confuse the predator chasing them. If they are caught, they kick the attacker (Fox in this case) to save themselves. Their legs are strong enough to push off and harm the predator.

Rabbit's fur helps it to camouflage, or blend in, with its surroundings. For example, arctic rabbits are white to blend in with the snow, but they change to a reddish-brown color to blend in during the autumn season. In addition to acting as camouflage, rabbit fur serves as protection.

Rabbits eyes are placed on the sides of the head, this allows rabbits to see in all directions, so chances are, when the predator is approaching, it will quickly see it and run.

The baroreceptors of the medulla oblongata send(s) sympathetic signals to arteriolar smooth muscle, helping to maintain peripheral resistance

The medulla oblongata is that part of the brain which controls involuntary actions.

Involuntary actions are actions we can't control.

Some common examples of involuntary actions are:

So therefore, the baroreceptors of the medulla oblongata send(s) sympathetic signals to arteriolar smooth muscle, helping to maintain peripheral resistance

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Doxycycline is primarily used to treat bacterial infections.  Among the options provided, it is commonly used to treat bacterial pneumonia and Lyme disease (caused by the bacterium Borrelia burgdorferi transmitted through tick bites).

Bacterial infections are caused by harmful bacteria that invade the body and multiply, leading to various illnesses. These microorganisms can infect different parts of the body, including the respiratory tract, urinary tract, skin, and wounds. Bacterial infections are typically characterized by symptoms such as fever, inflammation, pain, and localized or systemic signs of infection.

It is important to note that Doxycycline is not typically used to treat viral pneumonia, as viral infections do not respond to antibiotics. Dermatophytosis, which refers to fungal infections of the skin, hair, or nails, is also not a condition that is typically treated with Doxycycline, as it primarily targets bacterial infections.

Therefore, doxycycline is used to treat bacterial pneumonia and Lyme disease.

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Explanation:

1.-¿Es la primera vez que ocurre una pandemia en la humanidad?

La pandemia de coronavirus no es la primera pandemia que enfrenta la humanidad, a lo largo de la historia se han registrado varias pandemias, como la Peste Negra, una pandemia que ocurrió en Europa en el siglo XIV y mató a aproximadamente 200 millones de personas.

2.-¿Cómo se habrá enfrentado la gente a situaciones similares en los últimos años?

Cada pandemia que enfrenta el mundo ha traído nuevas lecciones y descubrimientos científicos sobre cómo reducir los impactos provocados por la enfermedad y nuevas formas de tratamiento como los medicamentos y las vacunas, que hasta el día de hoy tienen un impacto positivo y benefician a las generaciones actuales.

3.-¿Por qué debemos seguir las recomendaciones de los científicos?

Es fundamental seguir las recomendaciones de los científicos para contener un virus contagioso, pues a través de la ciencia se descubre cómo actúa el virus en el cuerpo humano, cómo se produce el contagio, cuáles son las mejores formas de prevención, etc.

La ciencia es fundamental para la humanidad, a través de estudios y evidencias científicas, el ser humano logra soluciones a problemas que impactan en la vida de las personas.

Answer:

D answer is correct

Explanation:

semi circular helps our sense of balance

Answer:

eardrum

Explanation:

The ear is a sensory organ that picks up sound waves, allowing us to hear. It is also essential to our sense of balance: the organ of balance (the vestibular system) is found inside the inner ear. It is made up of three semicircular canals and two otolith organs, known as the utricle and the saccule

The large influx of phagocytic cells into the lungs plays a role in the formation of infection sites called tubercles.

These tubercles are formed when the immune system tries to contain the infection by surrounding the bacteria with immune cells. As more and more immune cells accumulate, they form a hardened structure called a tubercle. Within the tubercle, the bacteria are kept contained and unable to spread throughout the body.

Human and other animal phagocytes can be classified as "professional" or "non-professional" depending on how well they are able to phagocytose. Many types of white blood cells make up the professional phagocytes (such as neutrophils, monocytes, macrophages, mast cells, and dendritic cells). Professional phagocytes have molecules called receptors on their surfaces that can identify dangerous substances, like bacteria, that are not often found in the body, which is the primary distinction between them and non-professional phagocytes. Phagocytes are essential for preventing infections as well as for maintaining healthy tissues by removing old, dying, and infected cells.

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Antibodies cover extracellular pathogens and kill them by preventing critical points on the pathogen that increase its infectiousness, such as receptors that "dock" viruses on host cells.

In order to bind MRA's to and neutralize foreign substances like infections and poisons, antibodies are released into the blood and mucosa (neutralization). Antibodies trigger the complement system, which lyses bacteria to kill them (punching holes in the cell wall).

During embryonic development, a unit from each gene is randomly chosen as each B lymphocyte cell is formed, and these units are then mixed up to make the finished antibody product. This method enables a relatively small number of genes to produce a tremendous number of potential combinations.

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Correct Question:

Explain how using antibody only when essential can limit the development of resistance bacteria such as MRA's.

Answer:

I think so, I dont exactly know how to explain it, sorry

Explanation:

Explanation:

Dinosaur tracks are a type of trace fossil. These are evidence of an animal's activity when it was alive, but are not part of the animal itself.

Explanation:

This is because most of the living things even marine animals need heat which is suitable for them, sunlight gets more to the surface which provides heat. It's easy to live if there is low pressure in the ocean so your energy doesn't get wasted.

Answer:

balance, D, reduction, mass and distance

Explanation: it will balance in that dierection, the stronger team would pull more overthowing the other team, resiestance = friction, everything needs mass for gravity

The father’s genotype would be Aa. As the mother is recessive, her genotype would be aa.

Below I have attached a Punnett square I made for the genotypes of the offspring. The possible phenotypes could be sneezing uncontrollably as a result to light exposure and also wincing / squinting at the sight of bright light. The percentage that the offspring would have ACHOO Syndrome is 50%, which means there is also a 50% chance they wouldn’t have ACHOO Syndrome. The phenotypes the children could also experience as a result of not having ACHOO Syndrome could involve not sneezing uncontrollably when around bright light, but I can imagine them squinting their eyes at light instead as that’s a natural thing people do, but they wouldn’t sneeze unlike those with ACHOO Syndrome.

Enzyme speed up chemical reactions in biology systems. Enzymes have active site that attract and bind specific substrates to produce products while all enzymes are proteins not all proteins are enzymes.

Enzymes are biochemical and organic substances which helps to speed up the rate of chemical reactions in a given system. However, these enzymes are highly specific when it comes to the substrates the bind with. In addition to that, the region through which enzymes binds substrates is known as active sites.

In conclusion, it can therefore be deduced from the explanation given above that biological enzymes are proteins in nature.

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If an ecosystem lost a keystone species, option C: a new keystone species would replace the old keystone species.

An ecosystem would suffer greatly if one of its keystone species disappeared. Other species' population sizes would fluctuate drastically. Ecosystems would look extremely different without their keystone species. However, their oxygen level would not be affected because of the replacements.

If a keystone species vanished, some ecosystems might not be able to adjust to environmental changes. That can lead to the ecosystem's demise or might open the door for an invading species to take control and drastically change the environment.

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Complete question:

If an ecosystem lost a keystone species, which outcome would be expected? responses

the oxygen supply in the ecosystem would be depleted.

the population numbers of other species would change dramatically.

a new keystone species would replace the old keystone species.

the temperature of the ecosystem would increase.

Answer:

True.

Explanation:

Hope this helps!

Global climate models cannot predict the exact global average temperature in 2100 with total certainty due to **inherent uncertainties** in the models and **unpredictable future human behavior**. These factors contribute to a range of possible outcomes rather than a single precise temperature prediction.

The first reason is the **inherent uncertainties** in climate models, which arise from factors such as the complex interactions between atmospheric, oceanic, and land processes, as well as limited understanding of some physical processes and natural climate variability. Additionally, models use different resolutions, leading to varying levels of accuracy. The second reason is the **unpredictable future human behavior**, as climate projections depend on future greenhouse gas emissions, which are influenced by factors such as population growth, technological advancements, and political decisions. Due to these uncertainties and unpredictable factors, global climate models can only provide a range of possible temperature outcomes for the year 2100.

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Chemical energy is stored in a fossil fuel and released in the form of kinetic energy when burned.

Fossil fuels, such as coal, oil, and natural gas, are derived from the remains of ancient plants and organisms that were subjected to high pressure and heat over millions of years.

These fuels contain energy-rich hydrocarbon compounds, primarily made up of carbon and hydrogen atoms. When fossil fuels are burned, the combustion process breaks down these hydrocarbons, releasing stored chemical energy.

This energy is then converted into heat and kinetic energy, resulting in the production of heat, light, and mechanical energy, which can be harnessed for various purposes, such as generating electricity or powering vehicles.

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Explanation:

If a cell became too large, an "information crisis" would occur. The cell has more trouble moving enough nutrients and wastes across the cell membrane. The rate at which food, oxygen, and water enter the cell, as well as wast products leave the cell, depends on the surface area of the cell and the cell's volume.

The statement that is NOT true regarding the electron transport chain is B. The electron transport chain is a pathway of electron flow that forms a part of cellular respiration.

It's a collection of membrane-bound protein complexes and mobile electron carriers situated within the inner mitochondrial membrane in eukaryotic cells. The phospholipid bilayer, which is a double-layered membrane, is an essential aspect of the electron transport chain. The inner mitochondrial membrane, which includes the phospholipid bilayer, is where the electron transport chain takes place. This allows the various complexes in the electron transport chain to communicate with one another and with the mobile electron carriers. ATP synthesis is the formation of ATP, which occurs in the final stage of cellular respiration. The electron transport chain generates a proton gradient across the inner mitochondrial membrane, which creates energy that is used to synthesize ATP molecules. This procedure is referred to as oxidative phosphorylation. Oxygen is required for the electron transport chain to operate, which is an accurate statement. Without oxygen, the electron transport chain would be unable to produce the proton gradient required for ATP synthesis, causing the entire cellular respiration process to halt.

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The RNA sequence that the DNA strand 3'-TACGACC-5' would encode is 5'-AUGCGUC-3'.Explanation:The given DNA template strand is 3'-TACGACC-5'.The RNA transcription process occurs on this DNA template strand and forms the RNA transcript that carries the genetic information from DNA to ribosomes.

During transcription, DNA strands are unwound and separated. RNA polymerase binds to a promoter region on DNA and starts making the RNA strand that is complementary to the DNA strand. RNA synthesis occurs in the 5' to 3' direction.In DNA, thymine is present but in RNA uracil is present instead of thymine. Hence the corresponding RNA sequence is 5'-UACGACC-3'.RNA polymerase builds RNA strands by aligning complementary RNA nucleotides to the template DNA strand.

The RNA sequence that the DNA strand 3'-TACGACC-5' would encode is 5'-AUGCGUC-3'. This sequence is formed by using the RNA complementary base pairing rules to the DNA sequence as mentioned below.DNA strand: 3'-TACGACC-5'RNA strand: 5'-AUGCGUC-3'The sequence of RNA that the DNA strand 3'-TACGACC-5' would encode is 5'-AUGCGUC-3'. Hence, option (c) is the correct answer.

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The earliest known angiosperm (flowering plant) comes from the early cretaceous and may have been the sammiguelia, a palm-like plant from the Late Triassic.

Angiosperms are also known as flowering plants and are characterized by having seeds inside of their fruit. In contrast, gymnosperms have raw seeds on the surface of their leaves but no flowers or fruits. Gymnosperm seeds are arranged in the form of cones.

Any of the roughly 300,000 species of flowering plants, known as angiosperms or flowering plants, which make up the largest and most diverse subgroup of the Plantae kingdom. About 80% of all currently living green plants are known to be angiosperms.

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Sleep apnea: excess weight => lungs and pharynx

Heart disease: excess weight, adipose cells, LDL

Liver: high fat diet => excessive fat in liver

ED: excess weight causes inflammation of blood vessels

Gallstone: HIGH FAT and high cholesterol.

What is apnea?

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Answer:

oxygen is released as a byproduct of photosynthesis.

Explanation:

Answer:

carbon dioxide

Explanation:

Answer:

alter the function of the resulting protein.

Secondary active transport occurs when one substance is coupled with the passive transport of a second substance.

The best description of secondary active transport is the statement: "Secondary active transport occurs when one substance is coupled with the passive transport of a second substance." In secondary active transport, the movement of one substance across the cell membrane is coupled with the movement of another substance, taking advantage of the existing concentration gradient created by another transport process.

This process typically involves a carrier protein or co-transporter that facilitates the movement of one substance against its concentration gradient while utilizing the energy stored in the electrochemical gradient of another substance. The energy derived from the favorable movement of the second substance down its concentration gradient is used to drive the transport of the first substance against its concentration gradient.

This mechanism allows cells to transport substances, such as ions or nutrients, into or out of the cell using the energy derived from the pre-established gradient of another substance. It is an essential process for the active uptake or extrusion of various molecules in cellular functions like nutrient absorption in the intestines or reabsorption in the kidneys.

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Answer:

Pituitary gland

Some form of early Homo is estimated to have evolved into Homo erectus around 1.7-2 million years ago, option B is correct.

Homo erectus is believed to have evolved around 1.7-2 million years ago based on fossil evidence and dating methods. Fossil discoveries, such as the famous Nariokotome Boy skeleton found in Kenya, provide crucial insights into the anatomy and characteristics of Homo erectus. These fossils, along with other archaeological and genetic evidence, suggest that Homo erectus was the first hominin species to exhibit significant anatomical and behavioral differences from earlier hominins.

The emergence of Homo erectus marked a significant milestone in human evolution, as this species had a larger brain size, more advanced tool-making abilities, and potentially even the ability to control fire. These developments laid the foundation for the subsequent evolution of Homo sapiens, option B is correct.

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The complete question is:

Some form of early Homo is estimated to have evolved into Homo erectus around:

A) 5-7.5 million years ago

B) 1.7-2 million years ago

C) 10,000-40,000 years ago

D) 50,000-70,000 years ago

The term "homologous chromosomes" refers to pairs of chromosomes that are identical in size and contain identical gene codes.

Chromosomes that are homologous have similar structural characteristics. the same genes located at the same loci.

One of a pair of chromosomes with the same gene sequence, locations, chromosomal length, and centromere placement is referred to as a homologous chromosome. One paternal and one maternal chromosome make up a homologous pair. A somatic cell of a human has a total of 46 chromosomes in its nucleus.

Homologous chromosomes are pairs of chromosomes that have genes for the same traits located at corresponding loci and are roughly the same length, centromere position, and staining pattern.

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