what statement did louis pasteur confirm with his broth e
Answers
Answer:
Pasteur observed that the broth in the straight-neck flask was discolored and cloudy, while the broth in the curved-neck flask had not changed.
Explanation:
He concluded that germs in the air were able to fall unobstructed down the straight-necked flask and contaminate the broth. The other flask, however, trapped germs in its curved neck, preventing them from reaching the broth, which never changed color or became cloudy.
Hope this helps.
Answer:
Pasteur observed that the broth in the straight-neck flask was discolored and cloudy, while the broth in the curved-neck flask had not changed.
Related Questions
what is the point called where the retina is connected to the eye?
Answers
Answer:
Nervo óptico
Explanation:
responsável por dar ao ser humano a capacidade de ver e processar informações visuais rapidamente quando totalmente desenvolvido
Answer:
Optical nerve.
Explanation:
The point called where the retina is connected to the eye is called the Optical Nerve.
Which type of nonvascular plant grows in new or disturbed environments?
A. mosses
B. ferns
C. hornworts
Answers
Answer:
A.mosses
Option A is the right answer
Is the greenhouse effect good or bad
Answers
step 1: bacteria through nitrogen fixation and nitrification convert nitrogen into a usable form
Answers
Answer:
Bacteria through nitrogen fixation and nitrification convert nitrogen into a usable form to be taken up by plants.how do electrons gain energy in photosystem 1?
Answers
Answer: they absorb photons from sunlight.
Explanation:
Answer:
They absorb photons
_______ is a primary developmental goal underlying the 10 principles on which the textbook is based.
A. Security and trust
B. Quantity of development
C. Directive opportunity
D. Teaching behavior
Answers
______________ surround each stoma and control its size.
A. Spongy Layer
B. Guard Cells
C. Palisade Layer
Answers
Answer:
The answer is B.
Explanation:
Guard cells is nearest to stomata which surround each stomata and control the size of stomata.
what does the m stand for in interphase
Answers
Answer:
I believe the answer is mitosis
Explanation:
Hope this helps.
1 pc
If
you are given a quadrat of 1.5 square meters and you count the
dandelions in 10 quadrats and find an average of 2 dandelions per quadrat
area. Use this information to estimate the population density of dandelions
per square meter in a 4500 square meter open field. (make your answer
just the number, round to the nearest 2 decimal places) *
Your answer
In a stable population of rabbits and wolves a government agency enacts a 1 point
Answers
Answer:
1.33 dandelions per square meters
Explanation:
The correct answer would be 1.33 dandelions per square meter of land.
Size of quadrat = 1.5 square meters
Average number of dandelions per quadrat = 2
Total study area = 4500 square meter
Population density = number of organisms per unit area
There were 2 dandelions per 1.5 square meters
How many would be per square meter?
= 2 x 1/1.5 = 1.3333 dandelion per square meters
To 2 decimal places = 1.33 per square meters
Use the drop-down menus below to identify the organ(s) that is/are responsible for each function of the
excretory system.
releases excess heat from body
reabsorb water to maintain normal composition and volume of blood
and fluids and prevent dehydration
excrete wastes that balance salt
Answers
Explanation:
releases excess heat from the body, which would be sweat glands, excretory system/
reabsorb h2o 2 maintain norm. composition, volume of blood=kidneys.
Answer:
1.skin
2.kidneys and large intestine
3.skin, large intestine, and kidneys
Explanation: got it right
What are the inputs and outputs of cellular respiration and photosynthesis?
energy
water
oxygen
sugar
carbon
dioxide
Photosynthesis
Cellular Respiration
Inputs
Outputs
Answers
Photosynthesis
inputs : water , carbondioxide,
outputs: oxygen, sugar
Cellular respiration
inputs : sugar, oxygen
outputs: water, carbon dioxide
What part of your brain controls all mental activities?
brain stem
medulla
cerebellum
cerebrum
Answers
Answer:
cerebrum
Explanation:
cerebrum controls reading, thinking, learning, speech and emotions
(1) What will be the frequency of the recessive allele in a population of 100 kangaroos if there are 50 dominant alleles?
a. 150
b. 0.75
c. 0.50
d. 0.25
(2) If the frequency of the recessive allele for a gene is 0.3, calculate the expected frequency of heterozygotes in the next generation if the population is in Hardy-Weinberg equilibrium.
a. 0.42
b. 0.21
c. 0.70
d. 0.30
Answers
Answer:
1. Option c
2. Option a
Explanation:
1. If there are 50 dominant alleles, this represent the frequency of dominant alleles p = 50/100 = 0.5
Using the formula p+q = 1 we can solve for the frequency of the recessive alleles q = 1 -0.5 = 0.5 = 50%.
2. the frequency of the recessive allele for a gene is 0.3 which is q = 0.3
From the Formula p + q = 1 we can solve for p the frequency of the dominant alleles = 1 - 0.3 = 0.7
To calculate for the number of heterozygotes, we use 2pq = 2 x 0.7 x 0.3 = 0.42
Look at the chemical reaction below
Magnesium + hydrochloride acid —> magnesium chloride + hydrogen
Mg + 2HCI —> MgCI2 + H2
In this reaction
Magnesium (Mg) is a reactant or product
Hydrogen (H2) is a reactant or product
Magnesium chloride (MhCI2) is a reactant or product
Hydrochloride acid (HCI) is a reactant or product
Answers
Answer:
Mg is a reactant ,H2 is a product, MgCl2 is a product and HCl is a reactant.
experiment to show transpiration takes place in plants
Answers
Explanation:
experiment to demonstrate transpiration phenomenon with the Bell jar method
A plant cell is placed in a freshwater solution. When it swells with water, filling it's vacuole,
we say that it has
A)crenated
B)plasmolyzed
C)lysed
D)become turgid
Answers
Answer:
D. The plant becomes turgid
Explanation:
Definition: In ecosystems, this is the breakdown of organic matter to its basic chemical components.
Answers
Answer:
Decomposition :)
Explanation:
Answer:
It is decomposition
Explanation:
How does an artificial pacemaker work?
Answers
A pacemaker helps monitor and control your heartbeat. The electrodes detect your heart's electrical activity and send data through the wires to the computer in the generator. If your heart rhythm is abnormal, the computer will direct the generator to send electrical pulses to your heart.
A goal of using animal models is to explain the molecular detail of specific behaviors encoded in the human brain. How would you compare the developmental biology experiments on memory and learning using the fruit fly, drosophila melanogaster, as evidence about the evolution of a human behavior?
Answers
Answer:
It is possible to compare the expression of homologous genes in the brain of D. melanoganster and humans, because the expression levels of conserved genes may be associated with the evolution of cognitive features such as complex learning and memory.
Explanation:
Model organisms can be used to understand the patterns and processes that affect human evolution. Drosophila melanogaster is a model organism that has been used to study expression patterns of conserved genes in the course of evolution. This model organism has also been used to develop genetic mutant lines in order to examine the role of genes evolutionarily conserved in animals, including those involved in neurocognitive development.
In genetic research, an experiment as the above described is framed in a research field named 'Behavioral Genetics', which is a discipline that studies how evolutionarily conserved gene networks may be associated with neurocognitive tasks during brain evolution.
Which two types of clouds extend vertically through the troposphere?
Answers
, and
cumulonimbus clouds
That would be my best guess, hope you get everything you needed :)
Question 3 of 10
2 Points
When can exponential growth happen?
O A. When there is unlimited food and space
B. When the death rate is high
C. When carrying capacity is reached
D. When there is competition for resources
Answers
Answer: when there is Unlimited food and space
Explanation:
When there is unlimited food and space. Exponential growth occurs when a population has unlimited resources, such as food and space, and there are no limiting factors such as predation, disease, or competition for resources. In such a scenario, the population will continue to grow at an accelerating rate without reaching a carrying capacity. Hence option A is correct.
What is exponential growth?
Exponential growth can occur when there are no limiting factors that affect the population size. This means that the population has access to unlimited resources such as food, water, and space. In this scenario, the birth rate exceeds the death rate, and the population grows at an increasing rate over time.
As the population grows larger, the rate of growth also increases, resulting in a J-shaped curve on a graph.
However, in the real world, exponential growth is limited by factors such as predation, disease, competition for resources, and environmental factors like weather and natural disasters.
When these limiting factors are present, the growth rate of the population slows down, and the population may eventually reach a maximum size that the environment can support, known as the carrying capacity.
At this point, the population growth rate slows down to zero, and the population size stabilizes at or around the carrying capacity.
Hence option A is correct.
To know more about exponential growth:
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Pre-Test
Active
TIME REMAININ
1
2
46:50
Chan Hee is inflating a basketball using an air pump. He notices that the pump gets warm as he uses it. What is a good
hypothesis that could lead to new experimentation?
If there is no air in a basketball, then it is hard to play the game.
A basketball that is inflated bounces better than one that is not inflated.
If air in a pump is squeezed more, then the air gets hotter because energy is added to it.
Basketball is more fun to play than baseball because you have to move a lot more.
Answers
Answer:
If air in a pump is squeezed more, then the air gets hotter because energy is added to it.
Explanation:
A good hypothesis in the given case is that inflating basketball is getting warmer, the more it is pumped, and as a result, it would possess more heat or more friction due to all the air being pumped into the basketball at a single time.
hope this helped!
Which statement best describes the kinds of questions science can answer ?
Answers
Answer:
option A
Science can answer only questions about the natural world
Explanation:
Science is a discipline which on the basis of implementation of experimentation procedure that can mimic the experimental setup resembling that of natural world. Therefore, is capable of answer questions about the natural phenomenas occurring in the natural world.
Answer:
option A.
Explanation:
That's because Science mainly deals with the study of the structure and behaviour of the physical and natural world through observation and experiments.
FALLING OF STONE
○ FAST CHANGE
○NATURAL DESIRABLE CHANGE
○NATURAL UNDESIRABLE CHANGE
○SLOW CHANGE
Answers
Answer:
answer is fast change due to free fall of object in air.
About 500,000 tons of sediment are eroded from the Grand Canyon every day.
Wind, water, and gravity are constantly widening the canyon. What is making
the canyon deeper?
A. Mass movements
B. Coastal erosion
C. Wind erosion
D. River action
Answers
extinction occurs when the environment changes and
Answers
Answer:
a population dies out
Explanation:
when the environment changes causes the animals or living specimens to die out
hi how old am i What is the dominant religion in North and South America? A. Islam B. Judaism C. Hinduism D. Christianity Please select the best answer from the choices provided
Answers
Answer:
D. Christianity
Explanation:
In the text area below describe the function of the
cell wall.
DONE
Answers
Plant cell walls perform many functions. Their main task is to support proper plant growth. This is accomplished by the cell wall creating a skeleton-like frame that enables plants to grow vertically and develop a rigid stem. Cell walls vary considerably in thickness and organization, which accounts for the wide range of plant shapes and sizes on the planet. They consist of two layers ‰ÛÓ a primary cell wall, which supports the cell as it matures, and a rigid secondary cell wall that appears after the primary wall stops growing. The primary cell wall is thinner and more flexible than the secondary wall. Internally, the primary and secondary walls have a similar physical composition. Over the course of a plant's life, they perform complementary functions to keep the plant healthy and vibrant.
Answer:
The cell wall supports and protects the cell, determines the shape of the cell, assists cells in communication, stores carbohydrates, and allows water and smaller particles to enter the selectively permeable structure of the cell.
in order to survive in its environment a single celled organism uses a contractile vacuole to remove excess water that diffuses into its cell. Another species a hydra also excretes excess water. Both processes involve the use of energy. Based on this information, state whether these two organisms live in fresh water or salt water support your answer
Answers
Answer:
They would live in salt water.
Explanation:
Salt water is a hypertonic solution where water needs to move outside of the cell because there is too much solute outside. Because the 2 organisms are removing excess water, it shows that they are living in salt water where water flows outside instead of inside the cell.
Based on the available information, these two organisms would:
Live in salt waterAccording to the given question, we can see that there is a need for survival which makes a single celled organism to make use of the vacuole to remove the excess water which it diffuses into its cell.
As a result of this, we can see that another specie, a hydra also excretes excess water which involves the use of energy.
Therefore, the conclusion we can reach about them is that they are living in salt water because it is a hyper tonic solution which allows water to move freely outside the cell because of the excess solute outside the cell wall.
Read more here:
https://brainly.com/question/15887615
Convert 16.45 m into Kilometers
Answers
Answer:
0.01645 KM
Explanation:
1000 M = 1 KM
16.45 / 1000 = 0.01645
Hope this helps!
