Pasteur disproved spontaneous generation by demonstrating that microorganisms did not grow in broth that was heated in swan-neck flasks and then allowed to sit undisturbed for several days. It was important that he placed the broth in control and experimental flasks before heating rather than transferring the broth to new flasks after heating. Why?

Answers

Answer 1

Answer:

See the answer below

Explanation:

It was important for Pasteur to place the broth in the flasks before heating rather than transferring it to new flasks after heating because the new flasks might be a source of contaminants in the form of microorganisms, hence, leading to a biased outcome.

In order to prevent cross-contamination and preserve the integrity of the outcome of the experiment, the broth needed to be placed in the flasks before heating instead of transferring it after heating.


Related Questions

what killed the dinosuars?​

Answers

Answer:

An asteroid

Explanation:

Answer:

There are many theories but one I rely on is that the meteor crashed into the ocean and created a gigantic tsunami along with smoke that both killed the dinosaurs.

Which of the following is not a benefit of scientific literacy?
A. being able to make personal decisions about science-related issues
B. being able to evaluate scientific information
O
c. being able to rely on opinions about science-related issues
D. being able to take part in science-related initiatives

Answers

It might be A. ( I hope this helped! )
It might be c because it’s says rely on opinions and you wouldn’t have to do that if you have your own scientific literacy

Why must an experiment have a control group?

Answers

Explanation:

The control group provides a baseline in the experiment. The variable that is being studied in the experiment is not changed or is limited to zero in the control group.

A round red ball is an example of
Physical change
Chemical change
Physical property
Chemical property
Explain why?

Answers

Answer:

1

Explanation:

I think that because look at the earth when it spins

A round ball is an example of physical change. Thus option a is correct.

What is physical change?

Physical changes are changes which affecting the form of chemical substances but not it's chemical composition. Physical change are the processes in which we can separate mixture from compound, but can't usually be used to separate compound into chemical elements or simplest compound.

Physical change takes place when mixture are can't separate by chemical changes then we separate by the help of physical change. In general a physical change is reversible using Physical means.

A physical change involves a change in physical properties. Example- physical properties including melting, freezing, sublimation etc.

Therefore, a round ball is an example of physical change. Thus, option a is correct.

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20) Do all three states of water have the same density?

Answers

Answer:

The same number of particles in a gas spread further apart than in the liquid or solid states. The same mass takes up a bigger volume . This means the gas is less dense. Density also depends on the material.

Which dialogue style would you see in a drama? “Where do you want to go shopping?” asked Kate. Aiden said, “Let’s go to a movie.” Javier: I can’t do my homework. I have a terrible headache.

Answers

Answer:

javier: i cant do my homework, i have a terrible headache

Explanation:

ive already done it.........

Help pls help pls help pls I love biology totalLy

Answers

Answer: I think 2 no.   it causes porousrock to suddenly harden

Explanation:

Explain why parents and children don't look exactly alike by posting on the discussion board. Use the vocabulary words: chromosomes, DNA, inherited traits, and mutations in your explanation.

Answers

Answer:

Explanation:

Deoxyibonucliec acid(DNA) contains the genetic constituent of an individual for a child or an individual he inherits equal proportion of genetic make up or traits from both mother and father hence, the genetic constituent of a child is never 100% mother or 100% father but a blend of the two to give a new genetic makeup that have never existed before and cannot be entirely identical with either parents but 50% identical with each parent.

Mutation is a sudden change in genome of an organism that is heritable, mutation alters the genetic constituent making it different from the original plan hence, if mutation should occur an individual could have a look that is not identical with the parent because the physical expression is the function of the genetic make up.

Chromosome crossing over effect could also alter the make up of an individual making it different from parental gene.

Biology
which is the best hypothesis that the experiment could test ?

Answers

Answer:

It will be the third one.

Explanation:

If all your organs are components in the human body system, what body part act as the boundary?

Answers

the endocrine system or the skin (:

Question 1 (1 point)
What is the benefit of using the metric system and Si Units?
A. to measure accurately on equipment
B. there is no need to use the same system of measurements around the world
C.to convey information accurately so scientists can refer to the same quantity no
matter the location or language
D. so that all measurement systems can be used together

Answers

Answer:

The correct answer is - option c. .to convey information accurately so scientists can refer to the same quantity no  matter the location or language.

Explanation:

S. I. system is stands for the international system of unit of measurement, it is standardized internationally which is used in most of the nations around the globe so use of SI system be same between different scientists and stream of science.

It is helpful in communicating scientific data accurately so scientists and researchers can refer same quantity no matter region or location and language.

Thus, the correct answer is - option C.

Explain using C.E.R (Claim, Evidence, Reasoning) Why there are no planets other than Earth that humans can live on

Answers

Explanation:

because there has not been any signs of live and they are not suidable for humans.

A major disturbance that almost caused a total collapse, but that the ecosystem was able to recover from eventually.

Answers

The provided question is incomplete, the correct question is attached with the answer:

Answer:

The correct answer is - the grasses which is diseased.

Explanation:

In the event that the grasses were diseased, the environment will recoup itself from this sort of disturbance. On the off chance that the number of inhabitants in snakes and hawks of prey increments so the biological system will recoup itself from this disturbance since snakes are the food of hawks.

So, if the number of inhabitants in snakes increments so more food is accessible for birds of prey as snakes and that is the reason populace of birds of prey likewise increments and the number of inhabitants in snakes is controlled.

An ecosystem is a system where an organism lives collectively and socialise with their surroundings. A robust ecosystem is necessary to keep the control nutrient cycle and food cycle.

A major disturbance from which the ecosystem overcame was when both the grasses and snakes got infected. The explanation for this is:

Increasing the number of snakes affected the size of the grass and decreased the number of rabbits as they were getting eaten by the snakes and hawks.

Increasing the number of snakes also increased the number of their prey hawks.

Increased hawks population controls the population of snakes and in this way, the biological food cycle will be maintained.

Therefore, disease in grasses and snakes caused a major disturbance that almost caused a total collapse, but the ecosystem was able to recover.

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WILL MARK BRAINLIEST!!!20 POINTS!!!

Answers

Answer:

It is the third bubble, sorry I answered this super late :(

Answer:

the answer is the third bubble:)

Explanation:

some types of aquatic frogs
bury themselves in the mud and spend the winter hibernating at the bottom of the lakes and ponds which characteristic of life does this represents

Answers

Answer:

this represents response to the environment

If a bullet were to penetrate a lung, which three anterior thoracic body cavities would it enter, and which layer of the serous membrane would it encounter first?

Answers

Answer:

First of all is ventral: cavity that makes up the thoracic and abdominopelvic cavity ventral: cavity that makes up the thoracic and abdominopelvic cavity

Secondly it is thoracic: chest cavity

And thirdly it is pleural cavities: which consist of ths lung cavity

That is it will encounter tbe parietal layer of the serous membrane first :lines cavity

Explanation:

The organs in the body are safely guarded by the membrane, cavities and sheaths(which has different compartment). They act to protect the organs in the body like lungs.

A person who was shot with a gun, the bullet must pass the body cavities when moving to the lungs. It must first pass through the 3 cavities before it arrives at the lungs that is the ventral cavity, thoracic cavity and the pleural cavity. The serous membrane is usually found within the walls of the thoracic cavity.

Analyzing Relationships Describe how environmental science helped the Trust decide that some dams should be removed.

Answers

Answer:Environmental servers build dams to keep water out of areas were animals safe.

Explanation:i just did this one and got it right!

Environmental science helped the trust decide that some dams should be removed dams reduces the complete ecological benefits that can be derived from the free-flowing rivers.

What are Dams?

Dams may be defined as a type of barrier that is significantly constructed in order to hold back water and enhance its level that forms a reservoir that is utilized to generate electricity or as a water supply.

Environmental science believed that dams tend to synthesize numerous environmental impacts like alteration in wildlife patterns, destruction of wildlife habituation, interference with the natural flow of water, etc. Dams are also associated with the mechanism of ecological restoration and remarkably interfere with the natural characteristics of water and deteriorate it.

Therefore, environmental science fundamentally supports the trust decide that some dams should be removed.

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Which continent is 60 n , 100 w

Answers

Answer:

Pretty sure Canada or North America

Explanation:

Assume that you found an object that looks like a dead twig. You wonder if it might be a stick insect. How could you determine if it is a living thing?

Answers

Answer:

I determine if the object is a living thing by checking to see if it responds to the environment

Could determine if it is a living being by checking if it responds to stimuli

Living beings or organisms are all complex structures that are characterized by carrying out activities such as:

feeding.development.reproduction.interaction with other organisms.respond to the environment.

Some of the most common classifications of living organisms are:

animals.plants.fungi.

According to the above, to know if that object is a living organism the best option would be to activate stimuli in it such as vision, touch, smell, hearing, or taste to see if it has any reaction to these stimuli.

For example, you can touch the object and if it moves it shows a response and therefore it is alive.

According to the above, the correct answer is checking if it responds to stimuli

What are some political thing in Europe

Answers

Answer:

There are three types of government systems in European politics: in a presidential system, the president is the head of state and the head of government; in a semi-presidential system, the president and the prime minister share a number of competences

Explanation:

can u mark me brainiest?

Without suffering of.....

Which of the following is an example of pseudoscience?
A. Electromagnetism
B. Horoscopes
C. Radiometric dating
D. Biology

Answers

the answer is b. horoscopes

People are drilling for petroleum because we all use products that are made of it, like gasoline, heating oil, asphalt (for roads), and plastics. How could you personally reduce your petroleum consumption?

Answers

Answer:

Use alternatives to driving/riding in a car or motorcycle (since they consume fuels. Also, avoid purchasing products that contain plastic if you can, and use reusable bags for shopping.

Explanation:

Why do ecosystems that are part of the same biome tend to be similar?

Answers

Because the life is adapted to that biome.

are viruses made of cells

Answers

Answer:

no

Explanation:

they are basically just packages of nucleic acid and protein

If an atom like aluminum becomes an ion by losing 3 electrons, what is the
charge on the ion?
1+
2+
3+
3-

Answers

The basis to this Qs. is that electrons are negatively charged, and protons are positively charged. Essentially, the reason for an atom’s neutrality is a balance between the proton(s)/ positive charge(s) and the electron(s)/negative charge(s). So when 3 electrons are lost, we have an extra 3 protons left. As the charge of the proton is positive, your answer is “3+”.

A microbiologist i under optimal is working with two genera of bacteria, A and B, to determine if cells are competent Strain minuteinti condit and DNA fragments that carry the gene for green fluorescent protein is added to each cut,e o each oulturew samples from each treatment are plated to nutrient agar and incubated, after which the plaes a ony the plates from sationary phase demonstrate fluorescent colonies. What can be concluded from the result? A. Both bacteria A and bacteria B cells are competent. B. Competence in bacteria A is constitutively expressed C. Competence in bacteria B is dependent on the phase of growth D. Neither bacteria A nor bacteria B cells are competence

Answers

Answer:

The correct option is C: "Competence in bacteria B is dependent on the phase of growth"

Explanation:

Since this set of cells produced fluorescent bacterial colonies, it means it took up the foreign strain of DNA and integrated in into its own plasmid. Since the other strain of cells was not able to present fluorescent bacterial colonies, something might have gone wrong or mishandled while preparing the competent cells.

Which best describes the scientific process?
A. A guess about a scientific idea
B. A type of mathematics
C. A group of scientists
D. A way to answer scientific questions

Answers

Answer:

D.

Explanation:

The scientific method is a way of doing science that helps answer questions. It also helps to obtain new knowledge.

A way to answer scientific questions is the best description of the scientific process. Hence, option D is correct.

What is the scientific method?

Through testing and experimentation, the scientific method establishes facts in an unbiased manner. Making an observation, formulating a hypothesis, making a prediction, carrying out an experiment, and then evaluating the findings are the fundamental steps.

The dissemination of the findings is the last phase in the scientific approach. After collecting and examining your data, you come to a conclusion regarding your hypothesis. A conclusion summarises the key takeaways from an experiment.

The best description of the scientific process is a way to answer scientific questions. Therefore, the correct option is D.

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Order the measurements from smallest to
largest.

Parsec

Light-year

Meters

Astronomical Unit

Gigaparsec

Megaparsec

kilometers​

Answers

megaparsec is the correct answer.

What nutrients, or matter, must pass through the cytoplasm to reach the cell structures that make up a cell?

Answers

Answer:

The correct answer is - amino acid, sugars and fats molecules are major nutrients.

Explanation:

Cell nutrients come in numerous structures, including amino acids, sugars and fats. So as to provide energy to the cell and provide structures, these particles need to go over the cell membrane, which capacities as a barrier that can be pass through different means like endocytosis, diffusion, facilitated diffusion and many more.

plasma membrane is semi-permeable layer which allows specific molecules and substances to pass through the cell and make celular structure and provide energy.

Which of the following resources would be considered green energy but not a renewable resource?
1.Wind
2.Solar
3.Hydropower
4.Nuclear

Answers

Answer: I think it's Nuclear, sorry if I'm wrong!

Explanation:

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dilations PLEASE HELP ME PLEASE What does the push up test measure A.Strength of arms and chestB .Your flexibility C .Your Cardio fitnessD .The strength of your abdominal muscles 3 Hundreds = ____ Tens 1. Mateo se peina condespus de secarse con la toalla.2. Mateo usapara afeitarse la cara todos los das.3. l se seca el cuerpo condespus de ducharse.4. Mateo usapara lavarse el pelo cada=each da.5. Mateo se lava el cuerpo condespus de entrenarse.6. Andrea se seca el pelo conporque es msrpido=fASTER.I Consider the function represented by the graph. What is the domain of this function? A single atom of an element has 11 protons, 11 electrons, and 12 neutrons. Which element is it? a V b Na c Mg d Se Give an expression that generates all angles coterminal with each angle. Let n represent any interger?1. 602. 120 Point O is on line segment NP. Given N P = 4x + 10, NO = 4x, andOP = x + 5, determine the numerical length of NP. Which statements are true based on the diagram?Select three options.1. Points N and K are on plane A and plane S.2. Points P and M are on plane B and plane S.3. Point P is the intersection of line n and line g.4. Points M, P, and Q are noncollinear.5. Line d intersects plane A at point N. Which expression is equivalent to 3x + 14 + 3x + 10? The Pacific Ocean is located at numberon the map above, while the Atlantic Ocean is located at numberA 1...2. 1...3C. 2...1D. 3...1Please select the best answer from the choices provided Find the distance between A(2,5) and B(-2,9) A liquid that can absorb and release huge amounts of heat energy without much change in the overall temperature of the water has what A Has a high density capacity B Has a high surface tension capacity C Has a high specific leat capacity D Has a high non-polar capacity why we should study the Ancient Greek culture. What is the polynomial function of least degree whose only zeros are -4,2, and 3? tell me the integers between this: Improving the odds of getting an idea across may be accomplished with any of the following strategies EXCEPT:__________.a) feedback.b) repetition.c) debate.d) message redundancy. hey please help, thank you! how does the social contract theory relate to the constitutional government? Fill in the next number in the list.5. 6. 11. 17. 28. 45