Answer: A. Each step has two choices.
Explanation:
Hope this helped
A dichotomous key uses question pairs to identify organisms by their group is a true statement.
How is a dichotomous keys used to identify organisms? List down the characteristics. Organize the characteristics in order. Split the specimens. Split the specimen even further. Mark a dichotomous key diagram. Test it out.Thus, the true statement is a dichotomous key that uses question pairs to identify organisms by their group.
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Explain in-detail the method of blood grouping and why should we do that?
a _____ force is when two forces cancel each other out and do not affect the motion of an object
Answer:
Friction and gravity are at work in each picture. Explain how each are at work and how they work together. Balanced forces - Two or more opposite forces are balanced forces if their effects cancel each other and do not cause a change in an object's motion.
Explanation:
Balanced forces are equal and opposite forces that act on the same object. That's why they cancel out. Action-reaction forces are equal and opposite forces that act on different objects, so they don't cancel out. In fact, they often result in motion.
alfred hershey and martha chase designed an experiment to determine the chemical makeup of griffith's transforming principle. define the term bacteriophage and explain why this organism was a good choice for this particular experiment. describe the procedure of the experiment using the terms bacteriophage, DNA, and proteins in your answer. Describe the results of the experiment and connect them to hershey and chases conclusion
Answer:
Bacteriophages (phages) are viruses that infect only bacteria and do not infect mammalian or plant cells. Phages are ubiquitous in the environment. Phages or bacteriophages were chosen as a model system for their simplicity, as they only contained protein-coated nucleic acid. Alfred D. Hershey and Martha Chase (who were part of the bacteriophage group) in 1952 studying the infection of the bacterium Escherichia coli by the T2 phage show that the information definitely resides in the DNA. They used phage with either [32P] -labeled DNA or [35S] -labeled proteins to infect the bacteria. Immediately afterwards, they centrifuged the sample so that the infected bacteria remain in the pellet and the virus capsids (proteins) remain in the supernatant. [35S] is found in the supernatant, whereas [32P] is found in bacteria. After one cycle of infection, it was observed that when phage labeled in the [35S] proteins were used, only 1% of the radioactivity was incorporated into the progeny. But when phages were [32P] labeled, more than 30% of the radioactivity was in the progeny. They showed directly that what is transmitted from one progeny to another is the DNA and not the proteins, despite having first "diluted" in a bacterium.
Explanation:
Bacteriophages are viruses that infect bacteria in a specific way. Bacteriophages, like other known viruses, are found in an intermediate zone between living organisms and inert matter. Bacteriophages bind to the host pathogenic bacterium, introduce their genetic material, replicate inside it and destroy it. Hersey, along with his assistant Martha Chase, used phages because they knew that T2 phages were made up of 50% proteins and 50% nucleic acids and that phages entered bacteria and reproduced. As the progeny carried the same infection traits, the genetic material of this had to be transmitted to the offspring, but the mechanism was unknown. These scientists carried out an experimental work with the T2 virus, a bacteriophage that infects the bacterium Escherichia coli, which it reproduces by attaching itself to the outer wall of the bacterium, injecting its DNA into it where it replicates and directs the synthesis of the phage's own proteins. Phage DNA is encapsulated within proteins and produces phages, which lyse or disrupt the cell and release phage from progeny. They infected a culture of bacteria with radioactively labeled phages: the protein coat with sulfur (35S) and its DNA with phosphorus (32P). After infection, they separated the phages from the bacteria by violent shaking using a mixer (hence the name of the experiment). By centrifugation the much smaller phages remained in the supernatant and the much larger bacteria in the pellet. 85% of the radioactivity corresponding to DNA appeared in the pellet and 82% of the protein in the supernatant. This result supported the idea that DNA was the only component of the bacteriophage that penetrated the interior of the bacteria and, having the ability to form new phages, constituted the genetic material.
What is the relationship between the hypothesis and conclusion?
Answer:
They both relate the outcome of an experiment. A hypothesis is an guesstimate of the outcome of an experiment, while the conclusion is the actual outcome.
Explanation:
How many calories do I need to gain muscle i am 75 pounds and 4 foot 5
Answer:
is there a reon why u want to gain mucle
Explanation:
What type of muscle is found in the heart that has gap junctions to allow electrochemical signals to cause rapid contraction?
A. Rough muscle
B. Smooth muscle
C. Cardiac muscle
D. Skeletal muscle
How does biodiversity affect sustainability after a catastrophic event in a particular biome or habitat?
Answer:
i think biodiversity affects after catastrophic event in a particular biome or habitat by affecting wetlands, forests and coastal systems by causing the spread of invasive species, mass species mortality and loss of habitat.
Explanation:
Why do you think mining on land would be less costly than mining in the ocean?
Explanation:
Because dense minerals are heavier and drop to the stream bottom, lighter minerals are carried along in the current of the stream. Why do you think that mining on land is less costly than mining in the deep ocean is? It is easier to get to land than the ocean and you need special equipment to go under water.
Explain what other steps need to be taken to demonstrate that each of these factors is needed for photosynthesis.
light
ASAP! 30 POINTS!!! Write a persuasive paragraph that argues either for or against wind energy. Be sure to include both the pros and cons of wind energy in your paragraph. Use all data, evidence and examples that you are aware of in your paragraph.
Answer:
Disadvantages of wind energy
Unpredictable. Perhaps the biggest disadvantage to wind energy is that it cannot be produced consistently. ...
Threat to wildlife. Wind energy does not cause environmental problems through greenhouse gas emissions, however, turbines can have an impact on wildlife. ...
Noise. ...
Looks. ...
Location limitations.
Explanation:
ᴍᴀʀᴋ ᴀs ʙʀᴀɪɴʟɪᴇsᴛ
Answer:
Wind energy is one of the most commonly used types of renewable energy. and also happens to be one of our fastest-growing sources of electricity. However, while there are a number of environmental benefits to using wind energy, there are some downsides. On the pros side, wind is a clean, renewable energy source, and is one of the most cost-effective sources for electricity. On the cons side, wind turbines can be noisy and unappealing aesthetically, and can sometimes adversely impact the physical environment around them. Similar to solar power, wind power is also intermittent, meaning that turbines are reliant on weather and therefore aren’t capable of generating electricity 24/7. Unlike coal, natural gas, or oil, generating electricity from wind doesn’t result in greenhouse gas emissions. While there are some environmental considerations that come with building large wind farms, once operational, wind turbines themselves don’t require burning any fossil fuels to operate.
Additionally, wind energy is completely renewable and will never run out. In opposition to traditional fossil fuels resources that replenish very slowly, wind naturally occurs in our atmosphere, and we don’t have to worry about supply issues in the future.
As far as upfront costs go, wind farms or individual turbines can be expensive to install. However, once up and running, operating costs are relatively low; their fuel (wind) is free, and the turbines don’t require too much maintenance over the course of their lifetime.
A wind turbine’s effectiveness in generating electricity depends on the weather; thus, it can be difficult to predict exactly how much electricity a wind turbine will generate over time. If wind speeds are too low on any given day, the turbine’s rotor won’t spin.
This means wind energy isn’t always available for dispatch in times of peak electricity demand. In order to use wind energy exclusively, wind turbines need to be paired with some sort of energy storage technology.
One of the biggest downsides of wind energy is the noise and visual pollution. Wind turbines can be noisy when operating, as a result of both the mechanical operation and the wind vortex that’s created when the blades are rotating. Additionally, because wind turbines need to be built up high enough to capture a good amount of wind, the turbines can often interrupt otherwise scenic landscapes, such as mountain ranges, lakes, oceans, and more.
Explanation:
Is Standing on a diving board a Kinetic energy or potential energy
Answer:
Explanation:
Potential Energy. This diver is standing at the end of the diving board, ready to dive. After he/she dives and is falling toward the water, they'll have kinetic energy, or the energy of moving matter. But even as they stand motionless high above the water, he/she has energy
what's one thing u wonder about ocean exploration
why did the scientific use a two-dimensional model instead of of another type of model.
Answer:
Sometimes, a diagram or image isn't enough. We need to test some things out in three dimensions. There are two main types of three-dimensional models, or models that have length, depth, and breadth, structural models and model organisms.
Explanation:
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Human blood is 90% water and 10% solute. What would happen if you gave
a patient an IV of pure water (0% solute)? The patient's cells will
remain unchanged.
swell or lyse.
shrivel.
Answer:
When a person receives fluids intravenously (through an IV bag, for example), a saline solution is sometime used. Giving large amounts of pure water directly into a vein would cause your blood cells to become hypotonic, possibly leading to death.
Explanation:
The answer is B: It swells.
A hypotonic solution has a lower concentration of solutes than another solution. In biology, a solution outside of a cell is called hypotonic if it has a lower concentration of solutes relative to the cytosol. Due to osmotic pressure, water diffuses into the cell, and the cell often appears turgid, or bloated.
what is mentruation? give example
Answer: a cyclical discharging of blood
Explanation:
What does a model of the carbon cycle show?
A. The amount of Earth’s carbon is constant.
B. The amount of Earth’s carbon cannot be determined.
C. The amount of Earth’s carbon decreases.
D. The amount of Earth’s carbon increases.
I think its A
Answer:
Changes that put carbon gases into the atmosphere result in warmer temperatures on Earth. This diagram of the fast carbon cycle shows the movement of carbon between land, atmosphere, and oceans. Yellow numbers are natural fluxes, and red are human contributions in gigatons of carbon per year.
The model of the carbon cycle determines the amount of earth's carbon is constant. Thus, option A is correct.
Carbon is the element that is responsible for the major life forms on earth. The conversion of carbon in varying life forms and the reservoir is given by the carbon cycle.
What is the effect of the carbon cycle on the amount of carbon?The carbon cycle is operated for the analysis of the conversion of the carbon in different states and life forms in the earth.
The conversion results in the change in the state of the carbon and its concentration in different constituents.
The earth is the reserved closed system and is consisted of a fixed amount of elements.
Thus, the amount of carbon in the earth is constant in the model of the carbon cycle. Thus, option A is correct.
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In the periodic table, elements are classified as ____________ according to their properties and their specific location within the periodic table.
Answer:
metals
Explanation:
In the periodic table, elements are classified as metals, nonmetals, and metalloids according to their properties and their specific location within the periodic table.
What is Periodic table?The periodic table is also called the periodic table of the elements which is defined as the arrangement of rows and columns of the chemical elements widely used in chemistry, physics and other sciences and usually represented by chemical symbols.
The elements of the periodic table are classified into groups based on the chemical and reactive properties of the elements where the three major groups are metals, nonmetals and metalloids. The metals in the left and bottom parts of the table give up electrons in chemical bonds.
Thus, in the periodic table, elements are classified as metals, nonmetals, and metalloids according to their properties and their specific location within the periodic table.
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what is the complementary dna strand for AGC CAT GTA TAC
Which statement describes the synapse?
A. It is the gap between neurons that ensures that information travels in multiple directions.
B. It is the gap between neurons that ensures that information travels in one direction only.
C. It is the part of the neuron that carries information through electrical impulses to the cell body.
D. It is the part of the neuron that carries information through chemical impulses to the cell body.
[tex]\pink{\bigstar}[/tex] [tex]\large\underline{\underline{\bf\green{Synapse:-}}}[/tex]
✯ Synapse is the gap between neurons that ensures that information travels in one direction only.
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
Therefore, the 2nd statement [B] is correct.
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
[tex]\pink{\bigstar}[/tex] Additional Information:-A Synapse is a small gap at the end of a neuron that allows a signal to pass from one neuron to the next. Synapses are found where nerve cells connect with other nerve cells. Synapses are the key to the brain's function.
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
The term synapse was first introduced in 1897 by Michael Foster in his "Textbook of Physiology" and derived from the Greek synapsis, meaning "conjunction."
Answer: B) It is the gap between neurons that ensures that information travels in one direction only.
Explanation: this is the right answer ik cuz i just completed the quiz and got 100% thx to the person above!! Im just double confirming that this is the right answer.....hope this helps :D
Another Organ System that depends on mine
Answer: Your respiratory system relies on your circulatory system to deliver the oxygen it gathers, while the muscles of your heart cannot function without the oxygen they receive from your lungs
Explanation:
<3
Forensic scientist Bennet asks his technician for the scalar quantity of fingerprints found at his crime scene. What would be the technician's most likely answer?
There were 13 fingerprints found at the crime scene.
There were fingerprints in the hallway facing the direction of the kitchen and fingerprints in the kitchen pointing toward the door handle.
There were individual prints dusted at the crime scene, but they have not been identified yet.
There were fingerprints found in the bedroom, some that look like they are sliding down the hallway, and prints leading to the refrigerator.
Answer:
first answer is correct
Explanation:
just took the test
Which of the following is not a principle of natural selection?
Answer: The last one on the bottom i'm in biology
The statement which is not a principle of natural selection is, in every population, adaptations allow some organisms to survive and reproduce better than others. So, the correct option is D.
What do you mean by Natural selection?Natural selection is the process through which populations of living organisms adapt and change their needs as per nature.
The given statement gives the idea of adaptation rather than natural selection. Natural selection gives the idea of competing for limited resources. Natural selection always leads to the most favorable types of variation that an individual possess.
Therefore, the statement which is not a principle of natural selection is, in every population, adaptations allow some organisms to survive and reproduce better than others.
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8.
Dave was observing two types of cells mounted on two different microscopic slides 'A' and 'B'
under the microscope. When he had observed the slide 'A' he noticed a large vacant space in the
cells and a dense round body located at one side of the cell. When he had observed the slide 'B',
there was no vacant space in the cell and he noticed a dense round body in the centre of the cell.
a) Identify the type of cell 'A' and 'B'.
b) Name the round dense structure seen in the cell.
c) Write the function of the round dense structure that he observed in the cell.
ans this please
will mark brainliest .
Answer:
The correct answer is -
a) A plant cell B animal cell
b) nucleus
C) Vacuole
Explanation:
In plant cells, there is a large vacant space present in the center which is actually a vacuole that plays role in various types such as nutrients storage, water balance. In plant cells, a dense round structure present at one side of the cell known as the nucleus.
In animal cells, the vacuoles are absent or very small however the round dense structure of the nucleus is present in the center of the cell. Thus, the correct answer is -
a) A plant cell B animal cell
b) nucleus
C) Vacuole
Can depletion of the ozone cause a rise in skin cancer among humans? Explain
Please help
Which of the following correctly describes the relationship between speed and velocity? (4 points)
Speed is the change in velocity over time; velocity is distance plus direction.
Speed is the change in distance over time; velocity is speed plus direction.
Speed is distance plus direction; velocity is speed plus time.
Speed is the change in acceleration; velocity is distance over tim
Answer: Speed is the change in distance over time; velocity is speed plus direction.
Explanation:
While speed does not include direction, velocity does
For example: If I was traveling North at 5 mph,
The speed would be 5 mph
while the velocity would be 5 mph North
A strand of DNA reads: ATGGCGCTTGACA. What is the sequence of the complimentary (opposite) strand?
Answer:
TACCGCGAACTGT
Explanation:
Hope this helps! Just remember the base pairs for DNA C=G and A=T
The diagram shows the life cycle of a fern,
What does stage 2 show?A. A gamete-producing fern plant is flat and shaped like a heart.
B. A zygote forms when a sperm fertilizes an egg cell.
C. A mature spore-producing fern plant has fronds and produces
spores
D. A spore grows into a mature gamete-producing plant,
Answer:
the correct answer is D!
A spore grows into a mature gamete-producing plant.
Explanation:
hope this helps :)
A spore grows into a mature gamete producing plant is best describe the life cycle of fern.
What is the life cycle of fern?The life cycle of the fern has two different stages such as sporophyte and gametophyte. The sporophyte stage which releases spores whereas gametophyte stage which releases gametes. Gametophyte plants are haploid whereas sporophyte plants diploid. This type of life cycle is known as alternation of generations.
So we can conclude that a spore grows into a mature gamete producing plant is best describe the life cycle of fern.
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Energy Changes in Chemical Reactions: Tutorial
Question
Draw the chemical reaction energy diagram for the synthesis of water. Then use the text box tool to write the names or
chemical formulas of the reactants and products on the diagram.
T
Line
Width: 2 pt
LIN
Lines
Shapes
Answer: Lowkey dont know
Explanation: Lowkey
DNA replication occurs during which phase of the eukaryotic cell cycle?
S phase
G1 phase
G2 phase
M phase
Answer: your awnser would be A
Explanation:
Will mark brainliest and give thirteen points
the awnser is D
a neap tide is when the moon is either above or below earth
and a spring tide is when the moon is on the side/both sides middle of earth.
Hope this helps and isn't too confusing.