Answer:
Alfred Hershey and Martha Chase
Explanation:
In 1952 Alfred Hershey and Martha Chase were working with bacteriophages or phages, which are viruses that infect bacteria. They knew that a phage had an outer shell of protein and an inner core of DNA. In addition, from the electron microscope observations, they also knew that during infection the virus attacks the bacterium by its tails and introduces its genetic material into the bacterium to multiply using its metabolic machinery. They radioactively labeled two sets of phages: one with 32P (which marks only DNA) and another with 35S (which marks only proteins). In two parallel experiments, they infected bacteria with viruses marked on their DNA and with viruses marked on their proteins. The cultures were shaken with a mixer to separate the virus particles from the bacterial coatings. They then performed a centrifugation to separate the phages from the bacteria, so that the larger and heavier bacteria remain in the pellet, while the phages remain in the supernatant. They found that the radioactivity of 35S appeared in the supernatant while that of 32P appeared in the sediment, from which new radioactively labeled virus particles appeared, demonstrating that DNA was the genetic material.
All of the organisms in the domain Archaea are
A. prokaryotes
B. eukaryotes
C. autotrophs
D. multicellular
All of the organisms in the domain Archaea are prokaryotes.
Archaea are unicellular organisms with no nuclei, hence are prokaryotes.
Characteristics of Archaea Greek word Archaios means ancient.They are unicellular organisms that resemble bacteria and have some similarity to eukaryotes.Hence a third domain Archaea was introduced by Carl Woese based on ribosomal RNA analysis.They can live in extreme conditions like higher temperature, higher cold regions etc.To learn more about prokaryotes :
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which answer is correct, ( i inserted a picture) please help ill give brainliest if correct
Answer:
D
Explanation:
Bohr determined that there are discrete (unique, different from one another) energy levels in the atom and that electrons will orbit the nucleus within these energy levels, known as orbitals.
Which of the following is a vector quantity?
A. distance of 25 km along Highway 66
B. a difference of 6°C between Point A and point B
C. an increase in a mass of 14 kg
D. a velocity of 2 m/s Northwest
1. An electromagnetic wave forms when a particle that has an electric charge
experiences which movement?
Answer:
where the answer chocies
Why might people use solar energy for their homes?
Answer:
There are many reasons why homeowners go solar, but improving the environment and cutting energy costs are the most common. Many people are aware that solar is a great home efficiency upgrade and are eager to reduce their carbon footprint while also improving property value.
Explanation:
Which of the following would likely move through the phospholipids of the
cell membrane most easily? *
CO2
Glucose
K+
Starch
Answer:
CO2
Explanation:
Oxygen and CO2 can move through the cell membrane through simple diffusion because they are small molecules.
It's possible that CO2 travels through the lipid bilayer far more quickly than any other molecule. Therefore, option (A) is correct.
What is the structure of cell membrane ?According to the fluid mosaic model, the plasma membrane is a mosaic of components—primarily, phospholipids, cholesterol, and proteins—that move freely and fluidly in the plane of the membrane.
All cells have a cell membrane, also known as a plasma membrane, which separates the interior of the cell from the external environment. A semipermeable lipid bilayer makes up the cell membrane. The movement of materials into and out of the cell is controlled by the cell membrane.
Therefore, small and simple molecules like water, H2O , CO2 can pass through the cell membrane easily as it is partially permeable.
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NEED HELP NOW. A chemical reaction occurs that involves combining 1 atom of zinc with 2 atoms hydrogen and 2 atoms of chlorine. After the reaction, how many atoms of each element will there be?
1 zinc, 2 hydrogen, 2 chlorine2 zinc, 2 hydrogen, 2 chlorine2 zinc, 1 hydrogen, 2 chlorine3 zinc, 2 hydrogen, 2 chlorine
Answer:
1 Zinc, 2, Hydrogen, 2 Chlorine
Explanation:
Zinc, 2, Hydrogen, 2 Chlorine is a chemical reaction.
What is chemical reaction?Chemical reaction, the transformation of one or more chemicals (the reactants) into one or more distinct compounds (the products). Chemical elements or chemical compounds make up substances.
Chemical reactions are a fundamental component of life itself, as well as technology and culture. Burning fuels, smelting iron, creating glass and pottery, brewing beer, making wine, and making cheese are just a few examples of ancient processes that involved chemical reactions.
The Earth's geology, the atmosphere, the oceans, and a wide variety of intricate processes that take place in all living systems are rife with chemical reactions.
Therefore, Zinc, 2, Hydrogen, 2 Chlorine is a chemical reaction.
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I NEEEEEEDDDD HEEELPPPPP PLEASEE
Answer:
1/4 = 25%
Explanation:
AO x BO = 1 AB, 1 AO, 1 BO, 1 OO
Which is the link between fossil fuel use and flowers blooming earlier in the spring season?
A. A warmer Earth due to fossil fuel emissions has milder winters and earlier springs.
B. Fossil fuel emissions contain compounds that are fertilizers.
C. Spring seasons are cooler due to increased fossil fuel emissions.
D. Increased greenhouse gases due to fossil fuel emissions allows more sunlight to reach Earth.
How many amino acids could be specified if codons consisted of two nucleotides instead of three? What problem would this present for an organism making proteins using all 20 amino acids? I need help with the last part i dont undertsand
Answer:
This could result in a mutation.
Explanation:
A change in the DNA can affect the work of cells because it can cause a mutation; it can be a good mutation or bad. The three main mutations that occur are Insertion, Deletion and Substitution. Insertion is when DNA base(s) are added in, Deletion is when DNA base(s) are removed. Lastly, Substitution is when DNA base(s) are switched on. All of these mutations can have effects. These effects are Silent effect, Missence, and Nonsense. Silent effect is a mutation that does not change the sequence of amino acids in a protein. Missence is a mutation that causes the sequence of amino acids to change. This can cause incorrect protein folding and protein malfunction. Nonsense is a mutation that causes an early stop codon. This effect leads to a protein that is too small. Also a Frameshift can occur. Framshift is when the reading of a frameshift is moved over by one or more bases such that every subsequent amino acid changes. An example of a frameshift is THE CAT ATE THE RAT. If you insert an A at the Beginning this happens ATH ECA TAT ETH ERA T. IN Conclusion there are two Mutations that also play a role in this Point Mutation and Chromosomal Mutaion. Point Mutation is when a single DNA base is either substituted, inserted or deleted from the sequence. Chromocomal Mutation is when large pieces of a chromosome or an entire chromosome is either substituted, inserted or deleted.
16 amino acids could be specified if codons consisted of two nucleotides instead of three.
What do you mean by Codons?Codons may be defined as an arrangement of three consecutive nucleotides in a DNA or RNA molecule that codes for a specific amino acid.
A mutation may be responsible for such problems that would present for an organism making proteins using all 20 amino acids.
A synonymous mutation means that one base within the codon gets substituted for another. Even though the same amino acid is still produced.
It changes the sequences of nucleotide bases within the codon, but ultimately the coded amino acids remain the same.
Therefore, it is well described above.
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Please Answer These Questions!
1. What is a stimulus?
2. Why does the body respond to stimuli?
3. What are some different types of stimuli?
4. What are sensory organs and what type of stimuli do these receptors respond to?
5. What is an explanation of how the information from stimuli is communicated to the brain?
6. What is a description of the two things that can happen when the brain processes the information from stimuli?
Hello, 3Coli Here!
Here are your answers:
1. What is a stimulus?
Stimulus is a natural body reaction caused by changes in the environment around or inside the organism. This is a response from the brain.
2. Why does the body respond to stimuli?
The body responds to stimuli, because it needs to protect itself.
3. What are some different types of stimuli?
The two main types of stimuli are external stimuli and internal stimuli. External stimuli are reactions triggered by changes that occur outside of the body, while internal stimuli are reactions triggered by changes inside of the body.
4. What are sensory organs and what type of stimuli do these receptors respond to?
The most commonly used sensory organs include Eyes, Ears, Tongue, Nose, and Skin. Eyes respond to light and motion, because they are used to see. Ears respond to sound, because they hear. The tongue is used to taste, so it senses flavors. The nose is used to smell, so it responds to scents. Finally, the skin is used to feel, so it responds to whatever it feels.
5. What is an explanation of how the information from stimuli is communicated to the brain?
Neuron receptors convert internal and external environments into electrical signals, and then is sent to the brain through nerves.
6. What is a description of the two things that can happen when the brain processes the information from stimuli?
After the brain receives the signal, it will provide a response. One type of response is that the body will physically react to the change. The second type of response is to avoid the change.
Hopefully, this helps! :D
Ask your question below!
Describe THREE examples of the effect of altitude on animals.(life science)
Altitude is an elevation from the sea level. It plays an important role in animals as it affects the respiratory rate, pressure on the cells, and homeostasis.
What is the respiratory rate?Respiratory rate is the breathing that involves the inhalation and exhalation of gases through the respiratory system. The breathing rate is reduced due to decreases in oxygen transport at a higher altitude which causes fatigue.
At higher altitudes, the pressure is more and in turn, affects the cells as the body also maintains an osmotic pressure to balance the fluid and internal organs. As the altitude increases the temperature drops which affects the homeostasis of the body resulting in more use of energy to keep warm.
Therefore, altitude affects respiration, cell pressure, and homeostasis.
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please help please i really need it
Answer:
b
Explanation:
Answer:
with what??? :(
Explanation:
1. What bone is shown with letter Q?
Radius
Femur
Ulna
20
Which type of molecule is pictured? *
(1 Point)
carbohydrate
lipid
nucleic acid
O protein
The type of molecule pictured here is a lipid.
(GIVING BRAINLIEST!!!!!!!!!!!)
One city is at a higher latitude than another city. How does this make the two climates different?
A) The higher the latitude, the lower the temperature.
B) The higher the latitude, the higher the temperature.
C) Latitude does not affect precipitation, but changes the temperature.
D) Latitude does not affect temperature, but changes the precipitation.
Answer: D) Latitude does not affect temperature, but changes the precipitation.
Explanation: Hope it helps :)
Answer:
answer is b
Explanation:
What term is used to describe the crust and uppermost part of the mantle?
Answer:
Answer down below!
Explanation:
The term is called the Asthenospehere. The Lithosphere is the layer of air surrounding it.
Hope this helps!
Which statement accurately describes recent population density and shifts in Southeast Asia?
Rural towns have many of the same opportunities as urban centers
Indonesia’s capital of Jakarta has become a megalopolis.
The population is rapidly declining
Overcrowding has pushed many people to migrate from urban to rural areas.
Answer:
Indonesia's capital of Jakarta has become a megalopolis.
Explanation:
I took the test
Answer:
Many city people are very poor and live in urban slums.
The greatest population densities are on the coasts, along the rivers, and in deltas.
Indonesia’s capital of Jakarta has become a megalopolis.
Explanation:
just did the quiz
which best describes how scientists found the human gene that makes insulin?
A. They worked backwards from mRNA to DNA.
B. They found insulin-producing genes in bacteria.
C. They used the base sequence to find the amino acid sequence.
D. They cloned insulin proteins using PCR
Answer:
i got answer A
Explanation:
helppp pleasee!!!!!!
Answer:
last option is a correct answer.
Explanation:
the moon and the earth spin around each other.
Hope this helps!
How many types of rocks can form from the rock cycle? A. 1 B. 2 C. 3 D. 4
PLEASE HELP!!!!!!!!! IM BEING TIMED!!
Answer:
B)
Explanation:
I think it is B, I learned this a long time ago correct me if I'm wrong. :(
Describe the impact of technology on the environment today.
Answer:
These mainly occur as a result of agriculture, mining, water usage and consumption of fossil fuels, all of which have been enabled by advancements in technology. Due to the increasing global population, levels of natural resource degradation are also increasing.
Answer:
technological advancements had lead to the industrial society, which has greatly increased pollution and habitat destruction. however, today technology is being utilized to reduce human impact on the environment.
Explanation: its the possible answer on edge 2021
Each different section of the chromosome represents a _____
*wasnt given any answers
When you are showing symptoms of a virus, what life cycle are you in? lysogenic or lytic?
Answer:
lytic
Explanation:
The lytic cycle involves the reproduction of viruses using a host cell to manufacture more viruses; the viruses then burst out of the cell
what is the central feature of the cell cycle
Answer:
The central components of the cell-cycle control system are cyclin-dependent protein kinases (Cdks), whose activity depends on association with regulatory subunits called cyclins. Oscillations in the activities of various cyclin-Cdk complexes leads to the initiation of various cell-cycle events.
Explanation:
I NEED HELPPP PLZZZZZZZZZZZZZZZZZ
Will Betelgeuse become a Neutron star or Black hole?
☁️ Answer ☁️
Scientists believe that Betelgeuse will most likely become a neutron star after it goes through a supernova event.
Hope it helps.
Have a nice day noona!~ ￣▽￣❤️
4. Name the three places (2 boundaries and 1 nonboundary) where volcanoes are created:
Biodiversity is the existence of many different kinds of plants and animals in an environment. Describe why the tropical rainforest is said to have the most biodiversity of all the land biomes
Answer:
Biodiversity: Tropical rainforests are areas of extremely high biodiversity compared to other ecosystems. Biologists estimate that tropical rainforests contain about 50% of the world's terrestrial plant and animal species, yet they encompass only about 6% of the world's land area.
Explanation:
I’ll really appreciate it if you help me out with these 2 questions .
Answer:
DEEEZNUTSINYOMOUTH
Explanation: