Final answer:
Hershey and Chase chose to use viruses because they are made up of DNA and proteins, and bacteriophages, in particular, inject only their DNA into the host cells. This was essential for proving that DNA is the genetic material responsible for heredity.
Explanation:
The reason that best illustrates why Hershey and Chase chose to use viruses in their experiments is A.) Viruses are made up of the two things that scientists were studying at the time, proteins and DNA. Hershey and Chase were focused on determining whether DNA or proteins were the genetic material responsible for heredity. They used the T2 bacteriophage, a virus that infects bacteria, particularly E. coli, because a bacteriophage's life cycle involves attaching to a bacterial cell and injecting its genetic material into the host. Unlike animal viruses, which enter the host cell completely, bacteriophages like T2 only insert their nucleic acids (DNA), leaving their protein coats outside.
By using radioactive isotopes to label DNA and proteins separately, they could trace the fate of each component after the T2 bacteriophage infected the bacteria. They found that only DNA entered the bacterial cells, leading to the production of new viruses. This provided strong evidence that DNA is the genetic material, as proteins did not enter the cells. Therefore, the use of bacteriophages, which separated the involvement of DNA and proteins during infection, was crucial for their experiments and the discovery that DNA contained the instructions for heredity.
What is the discriminat of the quadratic equation 3-4x=-6x^2
Answer:
-56
Explanation:
ax^2 + bx + c = 0 is the discriminant of the quadratic equation
3 - 4x= -6x^2
to
-6x^2 + 4x -3 = 0
We know that:
a = -6
b = 4
c = -3
Substitute in the formula of discriminant (b^2 - 4ac):
= 4^2 - 4 * (-6) * (-3)
= 16 - 4 * 18
= -56
Why are frogs said to have “two lives” ?
Answer:
One because they are amphibianstwo because amphibian means two lives third because they live on land and seaFourth because they live longer (I think)Explanation:
Frogs begin their lives in the water as eggs and then tadpoles and when they are fully developed they live on land.
Hope this helpsHope this is correctBrainliest plzAsk questions
Frogs are said to have “two lives” because they undergo a complete metamorphosis, meaning that they change form completely from one stage of life to another.
What occurs in frog metamorphosis?In their early life, frogs are called tadpoles. Tadpoles live in water and have gills for breathing. They eat algae and other small organisms. As they grow, tadpoles develop legs and lungs. They also lose their gills and become able to breathe air.
When tadpoles are fully grown, they metamorphose into frogs. Frogs live on land and have lungs for breathing. They eat insects and other small animals. The change from tadpole to frog is a dramatic one, and it is why frogs are said to have “two lives.”
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help PLZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ
Answer:
A, They break down dead organisms and add nutrients back to the soil that plants use.
Explanation:
Decomposers do do this, and they don't do the other two options so this would be the best option. Hope this helped :)
While watching a recent science fiction movie, one Klingon spaceship blows up a Droid spaceship with a laser gun. The Klingon crew watches out the port window and covers their ears to muffle the noise from the explosion. Scientifically, this scene is inaccurate because
Answer:
Space is a vacuum thus you wouldn't be able to hear any noise.
How might the human body be compared to a car bicycle? Need help like now! 15 points <33
Answer:
There are some similarities present between human body and car.
Explanation:
In human body, mechanical work is done with the help of energy while the car moves when energy is present in it. Human body gets energy by eating food while the car gets energy from the burning of fossil fuels such as petrol, diesel and CNG etc. Both human and car used organic compounds for the generation of energy. In human body, movement occurs through legs while in cars wheels used for movement from place to place. In human body, stomach produces energy while in cars, engine generates energy.
Which of theses statements correctly describes estuaries?
Answer:
An esuarie is the tidal mouth of a large river, where the tide meets the stream.
An estuary may be defined as a type of ecotone that illustrates a transitional zone of the freshwater river ecosystem and marine water ocean ecosystem.
What do you mean by Ecotone?An ecotone may be defined as a type of transitional zone where two ecosystems meet with each other. In a more simple sense, it is defined as the zone between to ecosystems.
In an ecotone, characteristics of both ecosystems are present, hence ecotone has high biodiversity as compared to both ecosystems. It is known as the edge effect.
When we talk about an estuary, it is an ecotone that comprises two ecosystems like a river and an ocean ecosystem. The water of the river is fresh while the ocean is salty.
Therefore, an estuary may be defined as a type of ecotone that illustrates a transitional zone of the freshwater river ecosystem and marine water ocean ecosystem.
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Which value is being measured in the columns labeled
"Fraction remaining" and "Percentage remaining"?
years of decay
O quantity of energy
O number of stable atoms
O amount of material that has not decayed
Hurry
Yuhan is creating a model of a virus, and she studies the table that outlines the differences between viruses and cells.
Viruses and Cells
Characteristic Virus Cell
Structure DNA or RNA in capsid, some with envelope Cell membrane, cytoplasm; eukaryotes also contain nucleus and many organelles
Reproduction Only within a host cell Independent cell division, either asexually or sexually
Genetic Carrier DNA or RNA DNA
Growth and Development No Yes; in multicellular organisms, cells increase in number and differentiate
Obtain and Use Energy No Yes
Response to Environment No Yes
Change Over Time Yes Yes
Study the table. For which reason do the datasupport the classification of viruses as nonliving?
A. Viruses contain genetic information.
B. Viruses evolve over time.
C. Viruses reproduce inside host cells.
D. Viruses do not take in nutrients.
Answer:
D
Explanation:
The answer is D, even though they also need a host cell to reproduce that is not mentioned in the table so the answer is D.
The data support classifying viruses as nonliving because they do not take in nutrients, lack independent metabolic processes, and cannot grow or develop independently. Option D is correct,
The data in the table support the classification of viruses as nonliving for several reasons. A key point is that viruses do not take in nutrients (Option D), reflecting their lack of metabolic processes and inability to obtain and use energy independently. Viruses also do not grow and develop like living cells, which further indicates they do not possess the full traits of life. Additionally, while viruses can reproduce, they can only do so within a host cell, indicating their dependence on other organisms for replication. In contrast, living cells have the ability to independently divide, grow, develop, obtain energy, and respond to their environment. These distinctions underscore why viruses are classified as nonliving entities.PLEASE HELP :(
how do physical and chemical properties help in the identification of matter
Answer:
Both physical and chemical properties play a crucial role in identifying unknown matter. Here's how they work together:
Physical Properties:
Easy to Observe: These properties can be observed without changing the matter's composition. Examples include color, texture, density, melting point, boiling point, and electrical conductivity.
Initial Screening: By observing physical properties, you can narrow down the possibilities. For instance, a shiny, yellow metal with a high melting point suggests gold, while a white, powdery substance with a low melting point could be sugar.
Chemical Properties:
Deeper Identification: Chemical properties describe how a substance reacts with other materials. Observing these requires a controlled experiment that changes the substance's composition. Examples include flammability, reactivity with acids, and the production of specific gases during a reaction.
Confirmation: By testing a substance's reactivity, you can confirm your initial suspicions based on physical properties. If the unknown metal reacts with sulfur to form a black sulfide, it strengthens the possibility of it being silver.
Together is Better:
Combined Approach: Using both physical and chemical properties provides a more robust identification process. For instance, if an unknown liquid is colorless, boils around 100°C, and extinguishes a flame, these combined properties strongly suggest it's water.
In conclusion, physical properties offer a starting point for identification, while chemical properties provide a more definitive confirmation. By considering both, scientists can effectively identify unknown substances.
Explanation:
Physical properties describe appearance and behavior, while chemical properties detail how substances react, aiding in matter identification.
Identifying matter involves observing and understanding its physical and chemical properties. Here's how these properties aid in identification:
Step 1: Observation:
Begin by observing the characteristics of the substance. Physical properties are those that can be observed or measured without changing the substance's chemical composition. Examples include color, density, melting point, boiling point, odor, and conductivity.
Step 2: Physical Properties:
Physical properties provide clues about the substance's composition and behavior under various conditions. For instance, the color and appearance of a substance can help differentiate it from others. The density helps determine its mass per unit volume, while the melting and boiling points indicate its thermal stability.
Step 3: Chemical Properties:
Chemical properties describe how a substance interacts with other substances and undergoes chemical changes. These properties include reactivity, combustibility, acidity, and the ability to undergo specific reactions. For example, if a substance reacts with acid to produce gas, it indicates a specific chemical property.
Step 4: Comparison and Analysis:
By comparing the observed physical and chemical properties of an unknown substance with known properties of various materials, scientists can narrow down the possibilities and identify the substance. This process involves using databases, reference materials, and experimental data to match the observed properties.
Step 5: Verification:
Once a potential identification is made based on observed properties, further testing and analysis may be conducted to confirm the identification. This may involve performing additional chemical reactions, spectroscopic analysis, or other specialized tests to validate the initial assessment.
Step 6: Conclusion:
Based on the comprehensive analysis of physical and chemical properties, a conclusive identification of the matter can be made. This identification aids in understanding its properties, behavior, and potential uses in various applications.
Which climate favors mechanical weathering?
dry dinale
cold climate
warm climate
desert cmate
Which statement best describes the climate of a city?
The average annual temperature of Austin, TX is 68.5°F.
The temperature in El Paso, Texas today at dawn was 57°F.
San Antonio, Texas had a high temperature of 102°F today.
Dallas, Texas had 8.6 centimeters of rain today.
Answer:
Austin tx
Explanation:
Climate is an overrall average of the temperature and such recorded over a period of time. The others only talk about the temperature in one day while the austin one talks about the annual temperature. Weather is recorded in one day and climate is over a long period.
The average annual temperature of a city best describes its climate, as climate refers to the long-term averages of the weather conditions. Statements with specific one-time temperature readings describe weather, not climate. Climate understanding also involves considering temperature ranges across seasons. The correct option is: The average annual temperature of Austin, TX is 68.5°F.
Understanding Climate Through Temperature Averages
The statement that best describes the climate of a city is 'The average annual temperature of Austin, TX is 68.5°F.' This is because climate is defined as the average weather conditions of a place over a long period, typically over 30 years, including factors such as temperature, precipitation, and wind. The other statements mention specific temperature measurements at a given time or on a single day, which are more indicative of weather rather than climate.
For a more comprehensive understanding of a location's climate, it's essential to consider both average temperatures and the variations or temperature ranges they experience across different seasons. An area could have the same annual average temperature as another but drastically different climates due to differing ranges between their hottest and coldest temperatures.
Where is aggregate generally found? Check all that apply.
floodplains
alluvial fans
mines
beneath the top soil
above the top soil
Answer:
floodplains
alluvial fans
mines
Explanation:
A soil aggregate are groups of primary soil particles which bond to one another more tightly than to surrounding soil particles. Soil aggregates has advantages such as beginners stable against rainfall and water movement thereby reducing erosion and releasing individual soil particles when struck with water that can seal the soil surface and clog pores which helps in soil proper soil aeration.
Soil aggregates are common in floodplains,alluvial fans,mines.
Name three natural sources of calcium carbonate?
Answer: Calcite, aragonite, vaterite
Explanation:
1. What are 3 personality traits that storm chasers should have?
Answer:
first is narsacisstic
second lovely
3 is boastful
explain the factors that would influence how fast echinoderms grow and how big they become
Answer:
Environmental factors and climate conditions affect the growth and how fast they grow.
Explanation:
An echinoderm is an organism (all marine) that has a spiny skin. The word "echinoderm" means "spiny skin." Starfish, sea cucumbers, brittle stars, and sea urchins are examples.
Most echinoderms develop from larvae to adolescent echinoderms by direct, or indirect development. In direct development, the fertilized egg is able to enter juvenile stage without becoming a larva. The juveniles stay close to the parent, and are cared for and looked after.
Echinoderms evolved from animals with bilateral symmetry. Although adult echinoderms possess pentaradial, or five-sided, symmetry, echinoderm larvae are ciliated, free-swimming organisms that organize in bilateral symmetry which makes them look like embryonic chordates.
Echinoderms have adapted to match the colour of their surroundings. Also, to protect and structure their bodies, Echinoderms such as sea urchins have interlocking plates of Calcium Carbonate which form a very hard internal skeleton.
An emission of energy as waves or subatomic particles:____ A. longitudinal B. radiation C. sound D. Surface E. transverse F. waves
Answer:
Radiation
Explanation:
emission of energy as electromagnetic waves or as moving subatomic particles.
have a good day
-Hops
Which is not a type of mechanical wave?
O A. surface wave
O B. earthquake wahy
O c. electromagnetic wave
O D. sound wave
Answer:
c. electromagnetic wave
**Explanation**
electromagnetic waves are waves that have an electric and magnetic nature and are capable of traveling through a vacuum. Electromagnetic waves do not require a medium in order to transport their energy. Mechanical waves are waves that require a medium in order to transport their energy from one location to another.
✌️;)
Plants require moisture, oxygen, carbon dioxide,light, and minerals for growth. These requirements are best described as *
I'd say these requirements are best described as reactants.
Plants require moisture, oxygen, carbon dioxide, light, and minerals for growth. These requirements are best described as Abiotic components.
What is Abiotic components?An abiotic factor is defined as the non-living part of an ecosystem that shapes its environment whereas in a terrestrial ecosystem, examples may include temperature, light and water and in a marine ecosystem, abiotic factors would include salinity and ocean currents.
A certain plant needs moisture, oxygen, carbon dioxide, light and minerals to survive which are abiotic components. Abiotic and biotic factors work together to create a unique ecosystem.
Thus, Plants require moisture, oxygen, carbon dioxide, light, and minerals for growth. These requirements are best described as Abiotic components.
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The 33 separate bones of the backbone are called
Answer:
Vertebrae
Explanation:
Your back can't be a solid bone because you wouldn't be able to pick things up off the ground, or twist around to see things.
Answer:
Vertebrae
Explanation:
Vertebrae are the 33 individual bones that interlock with each other to form the spinal column. The vertebrae are numbered and divided into regions: cervical, thoracic, lumbar, sacrum, and coccyx.
What happens to this carbon once it ends up in this reservoir? Does it cause any adverse changes to ecosystems there?
Answer:The carbon cycle plays a key role in regulating Earth's global temperature and climate by controlling the amount of carbon dioxide in the atmosphere. The greenhouse effect itself is a naturally occurring phenomenon that makes Earth warm enough for life to exist.
Explanation:
Carbon can be stored in various reservoirs for long periods as part of the carbon cycle, including the atmosphere, oceans, sediment, soil, rocks, and Earth's interior. It can potentially have adverse effects on ecosystems when it enters the atmosphere as CO2.
Explanation:The carbon once it ends up in a reservoir can be stored for long periods as part of the carbon cycle. Carbon reservoirs include the atmosphere, bodies of liquid water (mostly oceans), ocean sediment, soil, rocks (including fossil fuels), and Earth's interior. Carbon can enter the atmosphere again as CO2, which can potentially have adverse effects on ecosystems.
Which of the following is NOT likely to become a fossil?
A. a footprint in a rock
B. A price of bone buried in sand
C. A piece of cement
D. A preserved tooth
Answer:
The first one is right, its B
Explanation:
Yes the footprint may be in the rock for that moment but many things can happen to the rock. It can freeze and go through changes, or the footprint could cause it to break apart.
Therefore the answer is A
Answer:
B
Explanation:
for something to become a fossil, it needs to be safe from water or air otherwise it will decompose, weather, or erode away.
for A the footprint is a solidified impression, and it is safe from the elements
C will not go away since it will not blow and is not very susceptible to the elements
D has preserved in the name, that means it safe.
for B water and air can get to it. making it susceptible
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how could knowing that giraffes are four distinct species change the approach of conservationists or zookeepers who work with giraffes?
Answer:
It would help the zookeeper in their breeding program so as not to interbreed the four different species, but rather to breed each species seperately, so as to keep the giraffe as a whole from population pollution by producing hybrids that do not have much conservation values.
Knowing that giraffes are four distinct species could change the approach of conservationists and zookeepers who work with giraffes by requiring different conservation strategies and breeding programs for each species.
Explanation:Giraffes are now recognized as four distinct species: the southern giraffe, the Masai giraffe, the reticulated giraffe, and the northern giraffe.
This new understanding of giraffes as separate species could change the approach of conservationists and zookeepers who work with giraffes by requiring different conservation strategies and breeding programs for each species.
Conservationists and zookeepers would need to consider the specific habitat requirements, feeding preferences, and social behaviors of each species in order to effectively protect and care for them.
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Jill is studying the temperature output of an ammonium chloride hand warmer. What apparatus will best help her monitor the temperature change of the reaction?
Answer:
a thermometer
Explanation:
The apparatus that will help Jill to monitor the temperature change of the reaction would be a thermometer.
A thermometer is an instrument used in the measurement of temperature or temperature gradients across two regions.
A typical thermometer consists of 2 elements, namely;
A sensor that responds to temperature changes, andA scale or graduation that is used to measure the temperature changes.As the sensor responds to changes in temperature, the magnitude of change is indicated on the scale and this magnitude is what is recorded as the temperature of a body of a system.
Which of the following best describes the position of the Solar System within the Milky Way Galaxy?
A
halfway between the center of the Milky Way Galaxy and its outer edge
B.
along the outermost edge of the Milky Way Galaxy
C.
exactly at the center of the Milky Way Galaxy
D.
close to the center of the Milky Way Galaxy on its innermost arm
Answer: A we are half way to the center of the milky way
Explanation:
we are in the oron arm in the milky way and that is half way through the galaxy
ASAP!! 100 points! Only answer correctly please :)
1Folding is common in areas of thick _____.
igneous rock
metamorphic rock
sedimentary rock
2Eroded materials are called _____.
faults
folds
lava
sediment
3The mechanism which would permit large-scale movement of entire continents _____.
has been conclusively demonstrated
is suggested as theory
4Scientific data have been published to propose that the continents of Europe and North America are a0 at a rate of a1 cm per year.
5 Most of the oxygen available on Earth is produced by _____.
oceanic plankton
the atmosphere
terrestrial plants
the water cycle
Answer:
1) sedimentary
2) sediment
3) Continental Drift
5) Phytoplankton
Explanation:
Answer:
That should be
1) sedimentary
2) sediment
3) Continental Drift
5) Phytoplankton
Good luck
Cells in the thyroid have much higher concentrations of iodide ions than the extracellular fluid that surrounds them, which is delivered by the
blood. Are iodide ions transported into the thyroid cells by active transport or passive transport?
A active transport, because the cell must pump ions from regions of low concentration to high concentration
B. active transport, because charged ions cannot diffuse through the lipid bilayer of the cell membrane
C passive transport, because iodide ions diffuse into the cell from the surrounding fluids
D. passive transport, because charged ions are able to diffuse through the lipid bilayer of the cell membrane
Answer:
A.
Explanation:
Passive transport is defined as the movement of ion and other molecules through cell membrane without any energy input while active transport is the movement of ions and other molecular substances across cell membranes with an energy input which allows, molecules to move from a region of lower concentration to a region of higher concentration.
Uptake of iodide ions by thyroid cell is an active transport which is mediated by sodium/iodide symporter (NIS) protein, found in basolateral membrane of thyroid follicular cells. As the concentration of iodide ions is higher in thyroid cells, active transport make movement of iodide ions form extracellular fluid (lower concentration) to thyroids cells (higher concentration).
Hence, the correct option is A.
Answer:
A.active transport, because the cell must pump ions from regions of low concentration to high concentration
Explanation:
ONE QUESTION 60 POINTS PLEASE BE QUICK (and correct!)
Erosion is responsible for the formation of _____.
volcanoes
deltas
glaciers
all of the above
Answer:
Hi there
Erosion is responsible for the formation of glaciers
Hope it will help you
Explanation:
erosion is responsible for formation of glaciers
hey guys! please help me with my research project thats about how the corona virus is affecting the climate in a positive way
does anyone have facts about how the corona virus is affecting the world. i know this one and i saw it on a post but i forgot what it said but i think it said this, you can now see italys river from far away as its crystel clear. does anyone have facts thats similar to this. thanks! i will award 10 points if you answer
Which major contribution did Carolus Linnaeus to scientific study?
A classifying plants and proposing the theory of evolution
B classifying organisms and devising a system of scientific names
C studying animal remains and developing methods for experimental design
D using Greek names to identify every living thing
I am pretty sure that the answer is B.
2. Which take deoxygenated blood back
to the heart?
O veins
O arteries
O capillaries