A(n) __________ stroke is caused by a blood clot in one of the arteries leading to the brain. The clot may be due to plaque building up in the arteries going to the brain, reducing the blood flow to the brain.

Try this class experiment to detect the presence of enzymes as they catalyse the decomposition of hydrogen peroxide

Enzymes are biological catalysts which increase the speed of a chemical reaction. They are large protein molecules and are very specific to certain reactions. Hydrogen peroxide decomposes slowly in light to produce oxygen and water. The enzyme catalase can speed up (catalyse) this reaction.

In this practical, students investigate the presence of enzymes in liver, potato and celery by detecting the oxygen gas produced when hydrogen peroxide decomposes. The experiment should take no more than 20–30 minutes.

Equipment

Apparatus

Eye protection

Conical flasks, 100 cm3, x3

Measuring cylinder, 25 cm3

Bunsen burner

Wooden splint

A bucket or bin for disposal of waste materials

Chemicals

Hydrogen peroxide solution, ‘5 volume’

Small pieces of the following (see note 4):

Liver

Potato

Celery

Health, safety and technical notes

Read our standard health and safety guidance.

Wear eye protection throughout. Students must be instructed NOT to taste or eat any of the foods used in the experiment.

Hydrogen peroxide solution, H2O2(aq) – see CLEAPSS Hazcard HC050 and CLEAPSS Recipe Book RB045. Hydrogen peroxide solution of ‘5 volume’ concentration is low hazard, but it will probably need to be prepared by dilution of a more concentrated solution which may be hazardous.

Only small samples of liver, potato and celery are required. These should be prepared for the lesson ready to be used by students. A disposal bin or bucket for used samples should be provided to avoid these being put down the sink.

Procedure

Measure 25 cm3 of hydrogen peroxide solution into each of three conical flasks.

At the same time, add a small piece of liver to the first flask, a small piece of potato to the second flask, and a small piece of celery to the third flask.

Hold a glowing splint in the neck of each flask.

Note the time taken before each glowing splint is relit by the evolved oxygen.

Dispose of all mixtures into the bucket or bin provided.

Teaching notes

Some vegetarian students may wish to opt out of handling liver samples, and this should be respected.

Before or after the experiment, the term enzyme will need to be introduced. The term may have been met previously in biological topics, but the notion that they act as catalysts and increase the rate of reactions may be new. Similarly their nature as large protein molecules whose catalytic activity can be very specific to certain chemical reactions may be unfamiliar. The name catalase for the enzyme present in all these foodstuffs can be introduced.

To show the similarity between enzymes and chemical catalysts, the teacher may wish to demonstrate (or ask the class to perform as part of the class experiment) the catalytic decomposition of hydrogen peroxide solution by manganese(IV) oxide (HARMFUL – see CLEAPSS Hazcard HC060).

If students have not performed the glowing splint test for oxygen for some time, they may need reminding of how to do so by a quick demonstration by the teacher.

Additional information

This is a resource from the Practical Chemistry project, developed by the Nuffield Foundation and the Royal Society of Chemistry. This collection of over 200 practical activities demonstrates a wide range of chemical concepts and processes. Each activity contains comprehensive information for teachers and technicians, including full technical notes and step-by-step procedures. Practical Chemistry activities accompany Practical Physics and Practical Biology.

Answer:

The term that describes the relationship in which one organism lives inside the other one is endosymbiosis.

Explanation:

The given statement " To be considered a source of water pollution, the source must include a chemical" is False because a source of water pollution can include not only chemicals, but also physical contaminants like sediment or biological agents like bacteria and viruses.

Numerous factors, such as physical, biological, and chemical contaminants, can lead to water contamination. Although chemicals are frequently the cause of water pollution, a source need not contain a chemical in order to be regarded as a source of water pollution.

For instance, without the use of chemicals, soil erosion, sewage, farm refuse, and stormwater runoff can all cause water pollution. Therefore the given statement in false.

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City planners faced with the question of balancing concerns regarding mosquitoes in wetland restoration projects need to consider both the potential benefits and risks involved. On one hand, mosquitoes can serve as a food source for birds and contribute to the biodiversity and ecological balance of the wetland ecosystem.

They play a role in supporting the bird population and enhancing the natural beauty of the park. These aspects can be important factors in promoting environmental sustainability and attracting visitors to the area. On the other hand, there are legitimate concerns about the potential risks associated with mosquitoes, particularly in terms of disease transmission. While malaria is not typically a concern in the United States, other mosquito-borne diseases such as West Nile virus and Zika virus may pose risks to public health. As migration patterns change and more people move from regions where these diseases are prevalent, the potential for transmission could increase.

To strike a balance, city planners should consider implementing measures to mitigate the risks associated with mosquitoes while maximizing the benefits of wetland restoration. This can include implementing mosquito control strategies such as monitoring and targeted insecticide use, creating habitats for natural predators of mosquitoes, and providing education and awareness programs for the public. By adopting a comprehensive approach that addresses both ecological and public health considerations, city planners can create a wetland restoration project that balances the promotion of biodiversity and natural beauty with the protection of public health.

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Answer:

fungi

Explanation:

becouse he is a fun guy

i dont understand too:(

Answer:

The first three boxes are Carbon dioxide (the 6th pic), water and sunlight, I cant figure out the middle box it could be nutrients, and one of the last box's is oxygen (the o)

Sorry im  not much help im doing this too and like im literally stuck!

Answer:

The correct answer is ''Translocation​.''  

Explanation:

Translocation is a chromosomal abnormality that is due to a change in position of a chromosomal segment to another non-homologous chromosome of the same nucleus or to another part of it. It is produced by the exchange of segments between two chromosomes without loss of genetic material is called reciprocal or balanced translocation, when it gives rise to monocentric chromosomes.Translocations can be detected cytologically because the structural heterozygote forms a quadrivalent (4-chromosome association) in meiotic prophase. Sometimes they can also be detected by changes in the size of the chromosomes if the exchanged segments are of different lengths.

Answer:

B. What the climate was like in the area long ago.

Explanation:

All flowering plants produce pollen grains with distinctive shapes that change as climatic factors change as plants are generally distributed based on patterns of temperature and precipitation. So, fossil pollen records can tell us about the past climate.

Answer:

The answer is that It's true.

Smoking in the environment increases the risk of sudden infant death syndrome in infants.

Smoking causes cancer, heart disease, stroke, lung illnesses, diabetes, and chronic obstructive pulmonary disease (COPD), which includes emphysema and chronic bronchitis. Additionally, smoking raises a person's risk of developing tuberculosis, a few eye conditions, and immune system issues, such as rheumatoid arthritis.

We discovered that smokers had a smaller cerebral cortex than non-smokers, indicating that smoking was robbing smokers of their grey matter. This is significant because the cerebral cortex, a region of the brain that is essential for thinking abilities such as memory and learning, is thicker.

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Answer:

mars atmosphere is thin

Explanation:

took the test

Answer:

12-B

13-A

14-B

16-C

17-C

18-B

Answer:

Yes that is correct i think

Explanation:

Propelling neural signals is actually the function of excitatory neurotransmitters. The correct option is B.

Neurotransmitters are chemical messengers that the body craves to function. They are accountable for transmitting chemical signals or messages from one neuron to the subsequent target cell. A whole other nerve cell, a muscle cell, or a gland could be the next target cell.

Excitatory neurotransmitters, in particular, have excitatory effects on neurons. This means that they boost the probability that the neuron will send an action potential signal to the receiving neuron.

Thus, the correct option is B.

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Full Question ;

Propelling neural signals is a function of __________ neurotransmitters. A. neutral B. excitatory C. inhibitory D. impulsory

Answer:

Over the last century, the average temperature on the surface of the Earth has increased by about 1.0 degrees F.   The greatest impact is the droughts that my state is constantly in. I believe that we had a great part in global climate change. How I think that we have is all the air pollution and not taking care of out earth the way we should.  How I think that we can fix this is if we start powering our home with more solar. We can also reduce the amount of water that we use.  

Explanation:

Answer:

C) They may provide selective advantages.

D) Slight differences in the genetic code may have significant results.

Explanation:

The genetic code is universal, and present in most living beings . Generally, in most living organisms, the same codons are assigned to the same amino acids.  

DNA sequences make up genes that may have multiple variants, called alleles. DNA deoxyribonucleic acid, is transcribed into mRNA and then translated into amino acids that form proteins.

Natural selection mainly acts on phenotypes, which are dependent on proteins and the organisms's environment.  Phenotypes conferring advantageous traits are favored by the selection process- these help groups of organisms evolve over time.

There are 471 lichen species reported in Nepal, 48 of which are indigenous. 99 species of lichens from Sikles and Shivapuri were listed by Baniya (1996).

Nepal, with its diverse climatic conditions and varied landscapes starting from the lowlands to the excessive Himalayas, is understood to have a wealthy lichen vegetation.

The us of a's precise geography and diverse ecosystems possibly guide a sizable quantity of lichen species.

There are 471 lichen species mentioned in Nepal, 48 of that are indigenous. Ninety nine species of lichens from Sikles and Shivapuri had been listed by way of Baniya (1996).

In North America, there are over 3,six hundred forms of lichens, and those are best those we are aware about! Every 12 months, new discoveries are made. Lichens can be located all over the world and in North America.

Thus, there are 471 lichen species reported in Nepal

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To observe a flagellated bacteria we will first clean off the oil with the help of a lens paper as well as microscope cleaner and then we will first focus using the 10x objective and then move to the 100x objective.

The correct options are the options b and c.

Bacteria are basically unicellular prokaryotes who have a single circular chromosome. They have flagella for movement and are microorganisms and therefore need to be observed under microscope. To observe a flagellated bacteria, we need to first clean the oil on the coverslip using a lens paper as well as microscope cleaner.

To focus, we will first have to focus using the 10x objective and then fine focus using the 100x objective.

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Assuming that the PCR process is successful and efficient, the amount of DNA would increase exponentially, approximately doubling with each cycle.

Therefore, after 25 cycles of PCR, the amount of DNA would be approximately 2^25 times greater than the original amount.

To calculate the final number of base pairs, we can use the fact that each original molecule of DNA is doubled during each cycle. Thus, after 25 cycles, the original 800 base pairs of DNA would have been doubled 25 times:

2^25 x 800 base pairs = 33,554,43200 base pairs

Therefore, at the end of 25 cycles of PCR, there would be approximately 33.5 billion base pairs of DNA.

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Answer:

It favors extremes in traits.

Explanation:

3 types of selection:

Systems can be found in various domains, such as biology, ecology, society, information, and the physical world. Examples include the nervous system, ecosystems, economic systems, computer networks, and the solar system. Systems consist of interconnected elements working together to fulfill a common purpose.

Systems are structures or sets of interconnected elements that work together to achieve a common purpose. There are various types of systems found in different domains. Here are a few examples:

1. Biological Systems:

  - The nervous system: It includes the brain, spinal cord, and nerves, which work together to transmit signals and coordinate bodily functions.

  - The cardiovascular system: It consists of the heart, blood vessels, and blood, responsible for circulating oxygen, nutrients, and hormones throughout the body.

2. Ecological Systems:

  - Ecosystems: A complex system comprising living organisms (plants, animals, microorganisms) interacting with their physical environment (soil, water, climate) in a specific geographical area.

  - Food webs: Systems that depict the interconnectedness of various organisms in an ecosystem through their feeding relationships.

3. Social Systems:

  - Economic system: A network of individuals, organizations, and institutions involved in the production, distribution, and consumption of goods and services within a society.

  - Political system: Structures and processes through which a society governs itself, including institutions, laws, and decision-making mechanisms.

4. Information Systems:

  - Computer networks: Interconnected devices and communication protocols that enable the exchange of data and information between computers.

  - Database systems: Organized collections of data and software designed to efficiently store, retrieve, and manage large amounts of information.

5. Physical Systems:

  - Solar system: A system consisting of the sun, planets, and other celestial bodies held together by gravitational forces.

  - Climate system: The interactions between the atmosphere, hydrosphere, biosphere, and geosphere that influence long-term weather patterns and climate conditions.

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Traits that are inherited are referred to as heritable/genetic traits. Those that are as a result of external factors are referred to as non-heritable traits.

Traits refer to the physical attributes of living organisms.

Many attributes of organisms are inherited from their parents. Such traits have genes behind them and are known as genetic or heritable traits.

Some traits of organisms are acquired as a result of the influence of the environment in which they live. Such traits cannot be passed to the next generation and are therefore known as non-genetic or non-heritable traits.

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Answer:

Recombinant DNA is technology scientists developed that made it possible to insert a human gene into the genetic material of a common bacterium. This “recombinant” micro-organism could now produce the protein encoded by the human gene. Scientists build the human insulin gene in the laboratory. Then they remove a loop of bacterial DNA known as a plasmid and insert the human insulin gene into the plasmid. Researchers return the plasmid to the bacteria and put the “recombinant” bacteria in large fermentation tanks. There, the recombinant bacteria use the gene to begin producing human insulin. Scientists harvest the insulin from the bacteria and purify the substance for use as a medicine for people.

Explanation:

Based on the nutrition labels and the nutrient requirement of a marathon runner, the marathon runner will choose sample A because it is rich in carbohydrates.

A marathon runner would typically choose a diet plan that supports their energy needs, enhances performance, and aids in recovery.

This would involve diets rich in carbohydrates, proteins, and sufficient water.

Carbohydrates are the primary fuel source for endurance activities. A marathon runner's diet should include sufficient carbohydrates such as whole grains, fruits, vegetables, and legumes.

Marathon runners need slightly more protein than sedentary individuals to support training adaptations and minimize muscle breakdown

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The spreading out of molecules in the air from a center of concentration is caused by diffusion. Diffusion is the movement of molecules from a region of high concentration to a region of low concentration.

This process occurs due to the random motion of particles, and it is driven by the natural tendency of particles to move from an area of high concentration to an area of low concentration.

Diffusion plays a vital role in many natural processes, including gas exchange in the lungs, transport of nutrients and waste products across cell membranes, and the release of odor molecules into the air.

In each of these processes, the molecules move from a region of high concentration to a region of low concentration due to the natural tendency of particles to spread out and become evenly distributed over time.

The rate of diffusion is influenced by several factors, including the concentration gradient, the temperature of the environment, and the size and shape of the molecules involved.

Diffusion can be a slow process, particularly over long distances or in areas where the concentration gradient is small, but it is a fundamental mechanism that underlies many of the processes that allow living organisms to function and survive.

Overall, the spreading out of molecules in the air from a center of concentration is an essential process that is driven by the natural tendency of particles to diffuse and become evenly distributed over time.

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Answer:

Fermentation

Explanation:

Yeast is fungi and do alchohalic fermentation

The first law of energy can be applied in food processing whereby foods are converted from one form to another.

Food processing is the process by which food is converted from its natural state obtained from plants to a more edible and palatable state for consumption by humans.

The first law of energy states that energy cannot be created nor destroyed but can be converted to other forms.

Therefore, the first law of energy can be applied in food processing whereby foods are converted from one form to another.

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Answer:

The answer is (A) Pseudopodia

Explanation:

The function of Pseudopodia is extensions of cytoplasm in the cell membrane allowing the cell to crawl.

Cilia are short, hair-like structures that surround the cell and help it move.

Flagella are whip/tail-like structure that helps propel the cell forward.

It's apparent that the Answer is A because that is what matches the definition of helping the cell crawl.