For the DNA Base Sequence AAT, what is the matching mRNA Codon? Also, what is the correct tRNA Codon that binds to the mRNA Codon? And what is the correct amino acid that is coded by the base sequence?
Which microscope is often used to view metal surfaces? scanning electron microscope scanning tunneling microscope transmission electron microscope compound light microscope
Answer:
The answer is B
Explanation:
Scanning tunneling microscope is often used to view metal surfaces. The correct option is B.
What is scanning tunneling microscope?Scanning tunneling microscopy, is a visualization method that generates ultra-high quality pictures at the atomic scale without the utilization of light or electron beams. Gerd Binnig and Heinrich Rohrer, two IBM scientists, devised STM in 1981.
STMs are useful since they provide investigators with a three-dimensional profile of a surface.
This is usually allowing them to examine a wide range of characteristics such as roughness, surface defects, and determine things about atoms such as size and conformation.
Scanning tunneling microscopes are microscopes being used examine metal surfaces.
Thus, the correct option is B.
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e spend our lives in visible light without risks to our health. Yet exposure to UV waves in sunlight can cause skin cancer. What is the BEST explanation for this?
Atom A has an atomic number of 19 and mass number of 40. Atom B has an atomic number of 20 and a mass number of 40. Which of these is an accurate statement?
A) Atom A has more protons than Atom B.
B) Atom A has one less proton and one more neutron than Atom B.
C) Atom A has an extra nucleon compared to Atom B.
D) Atom A has one more proton and one more electron than Atom B.
Atom A has one less proton and one more neutron than Atom B, as the mass number is the same but the atomic number differs by one. Hence, option B is correct.
The correct statement about Atom A with an atomic number of 19 and mass number of 40, and Atom B with an atomic number of 20 and a mass number of 40, is that Atom A has one less proton and one more neutron than Atom B. This is because the atomic number indicates the number of protons and the mass number is the sum of protons and neutrons. Since Atom A and Atom B have the same mass number but different atomic numbers, it can be deduced that Atom A must have one less proton and consequently one more neutron than Atom B in order to maintain the same mass number of 40.
Acetylcholinesterase breaks down acetylcholine to prevent additional __________.
The acetylcholinesterase breaks down into acetylcholine in order to prevent additional firing of neurons in which may be found in the neuromuscular junction. The acetylcholinesterase is considered to be an enzyme that is usually found in the autonomic nerve, the endings of voluntary nerves and the parasympathetic involuntary nerves.
The ________ is not the name of a pleistocene glacial episode in north america.
Which of the following organisms causes malaria?
Anopheles mosquitoes
Rats
Flies
Protozoan
The correct answer is option Protozoan.
Malaria is caused by the Protozoan parasite called Plasmodium. It is transmitted by mosquito female Anopheles which bites between the dusk and dawn.
It is an acute febrile illness with an incubation period of 7 days or longer. its symptoms include chills, headache, weakness, abdominal pain, et cetera.
The initial symptoms is mild but later it can be severe.
The organism that causes malaria is a protozoan. The correct option is D.
The protozoan species Plasmodium is responsible for causing malaria in humans.
Malaria is a vector-borne disease transmitted to humans through the bites of infected female Anopheles mosquitoes.
These mosquitoes serve as the vector for the Plasmodium protozoan, which enters the human bloodstream during a mosquito bite and infects red blood cells, leading to the onset of malaria.
When an infected mosquito bites a human, it injects sporozoites, which are the infective form of the Plasmodium parasite, into the bloodstream.
From there, the sporozoites travel to the liver, where they multiply and develop into merozoites.
Therefore, the correct option is D.
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Complete question:
Which of the following organisms causes malaria?
A. Anopheles mosquitoes
B. Rats
C. Flies
D. Protozoan
1. What is matter? (Points : 1)
Matter is anything that is made of organic substances and is found on the earth.
Matter is anything that is made of atoms and that has mass.
Matter is an element.
Matter is a compound
Answer:
Matter is anything that is made of atoms and that has mass.
Explanation:
Matter is anything that occupies space and has mass
1. When potatoes are in the ground, do they swell with water when it rains? If not, how do you explain that. If so, what are the advantages or disadvantages in this adaptation?
To locate a specimen on a prepared slide with a compound microscope, a student should begin with the low-power objective rather than the high-power objective because the
Answer: The field of vision is larger under low power objective than under high power.
Explanation: it will damage the slide if its on high power
When the blood glucose level rises after a meal, the first organ to respond is the:
a. gallbladder.
b. kidney.
c. liver.
d. stomach.
e. pancreas?
Answer: Option E. Pancreas
Explanation:
When the blood glucose level rises after a meal, the first organ to respond is the Pancreas.
When the blood sugar levels rise, insulin is released by pancreas. Insulin released in the bloodstream helps to absorb the sugar and allows the liver to store sugar. Like this the process lowers the blood sugar level.
When blood sugar levels gets lower the pancreas are allowed to release glucagon, which allows the liver to release the stored sugar. If the blood sugar levels rise, the release of glucagon is stopped.
Hence, the correct option is Pancreas.
Smokers are more susceptible to respiratory infections because
. A major concern about increasing global temperatures is that a large portion of polar ice could detach and melt into the ocean. If this happened, which two spheres would interact?
A. geosphere and atmosphere
B. cryosphere and biosphere
C. hydrosphere and atmosphere
D. cryosphere and hydrosphere
The correct answer is D. Cryosphere and hydrosphere.
Explanation
The Cryosphere refers to the parts of solid-state water on the earth's surface, including glaciers, ice sheets, frozen terrain, ice in lakes, rivers, and seas, among others. On the other hand, the hydrosphere refers to the layer of land composed of water mainly in a liquid state, including oceans, seas, rivers, lakes, lagoons, among others. According to the above, if a glacial falls off and falls into seawater to melt there, the layers of the earth that are interacting are the hydrosphere and the cryosphere. So the correct answer is D. Cryosphere and hydrosphere.
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Scientists find evidence that the genes involved in tooth development exist in chickens, even though chickens do not normally develop teeth. The formation of teeth in chickens can be controlled by introducing a virus into chicken embryos that "turned on" their tooth-developing gene. They find that the beaks of the virus-modified chicken embryos contain cone-shaped teeth similar to embryonic crocodile teeth. Which of the following best describes the conclusion that can be drawn from this experiment?
a As bird evolution continues, birds like chickens will develop teeth like dinosaurs and reptiles.
b The growth of teeth in chickens supports the hypothesis of a common ancestor between birds and reptiles.
c The chickens with teeth are more closely related to crocodiles than they are to regular toothless chickens.
d With enough genetic engineering, chicken embryos can develop into reptiles like crocodiles.
You are attempting to isolate cells for your karyotype, and you find one cell in each of the phases (prophase, metaphase, anaphase, and telophase). which one is best suited for a karyotype?
A client is en route to the emergency department after sustaining a gunshot wound to the chest. Which priority nursing action should the nurse take to prepare for the arrival of the client?
More cortical space is dedicated to areas of the body that are more sensitive. this best describes the
What event directly triggers the release of neurotransmitter shown in a?
An action potential at the presynaptic neuron's axon terminal triggers the opening of voltage-gated calcium channels. This leads to the release of neurotransmitters through exocytosis. The neurotransmitters then bind to the postsynaptic receptors, possibly triggering a new action potential.
Explanation:The event that directly triggers the release of neurotransmitters, such as acetylcholine (ACh), is the arrival of an action potential at the axon terminal of the presynaptic neuron. This action potential causes voltage-gated calcium channels to open, leading to an influx of Ca²⁺ ions. These calcium ions facilitate the fusion of synaptic vesicles containing neurotransmitters with the presynaptic membrane, ultimately causing the release of neurotransmitters through exocytosis into the synaptic cleft.
Once in the synaptic cleft, the neurotransmitter, like ACh, binds to receptors on the postsynaptic membrane. This binding opens ion channels, such as ligand-gated Na⁺ channels in the case of ACh at the neuromuscular junction, which leads to depolarization of the postsynaptic neuron and a possible generation of a subsequent action potential.
Neurotransmitter release is triggered by the opening of voltage-gated calcium channels in the presynaptic neuron. When an action potential reaches the axon terminal, these channels open, allowing calcium ions to enter the presynaptic cell. The increase in calcium concentration inside the cell triggers the fusion of neurotransmitter vesicles with the presynaptic membrane, leading to the release of neurotransmitters into the synaptic cleft.
What distribution of phenotypes follows a normal bell shaped curve?
When water and nutrients from the soil travel up from the roots of a plant through the stem to the leaves, they do so in which of the following structures?
Answer:
Xylem
Explanation:
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Which description is not a property of an acid?
A. Sour taste
B. Corrosive
C. Slimy feel
D. Dissolves metals
A description that does not reveals a property of acid is a Slimy feel. Thus, the correct option for this question is C.
What are the properties of an acid?The properties of acid are as follows:
Acids have a sour taste. Acid changes the color of blue litmus red. Acids significantly react with active metals to yield hydrogen gas.They are good conductors of electricity.Thye reacts with carbonates in order to produce carbon dioxide gas.Among the options, give, sour taste, corrosive in nature, and dissolves metals in order to yield hydrogen gas are the properties of acids. But a slimy feel is a characteristic feature of strong bases such as NaOH. They are slippery and slimy in nature. Hence, a slimy feel is not a property of acid.
Therefore, the correct option for this question is C.
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A client, admitted to the hospital with a fractured hip, is scheduled for surgery for a total hip replacement. in which position should the nurse place the client's affected limb after surgery?
Final answer:
Post-surgery for a total hip replacement, the affected limb should be positioned in neutral with a slight hip abduction to prevent dislocation and minimize the risk of complications such as DVT and pressure ulcers.
Explanation:
After a client undergoes surgery for a total hip replacement, it is critical to position the affected limb properly to prevent dislocation and facilitate healing. The limb should be kept in a neutral position, with the toes pointing upwards and the hip in slight abduction (away from the midline of the body) to prevent cross-legging and excessive bending. This careful positioning not only helps the hip prosthesis to stabilize but also minimizes the risk of complications such as deep vein thrombosis (DVT) and pressure ulcers.
There are 20 different amino acids. what makes an amino acid different from another
The 20 different amino acids gets differ from each other by varying side chain, i.e., R group.
What are amino acids?Amino acids are compounds that form proteins when they integrate. The fundamental components of life are amino acids and proteins.
Amino acids are left over after proteins are metabolized or broken down. To help the body, the human body utilizes amino acids to start making proteins: Food is broken down.
Amino acids are organic compounds that possess amino and carboxylic acid functional groups, as well as an amino acid-specific side chain.
Amino acids differ in terms of their side chains, that are made reference to as R groups. Each amino acid's R group will have a distinct structure, electrical charge, and polarity.
Thus, this R group make the amino acids different.
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What are two structures that are found in plant cells that are not found in animal cells
If the fat in a container is solid at room temperature, what type of fat is it?
a. saturated fat
b. monounsaturated fat
c. trans fat
d. short-chain fatty acids
e. polyunsaturated fat
Some rats have become resistant to common pesticides. Which statement best explains how the rats became able to resist those pesticides
Exceptionally large babies increase a mother's mortality risk when giving birth and exceptionally small babies tend to die at birth or shortly afterward. for these reasons, birth weight in human babies is generally:
The weight that is considered normal for a newly born baby that is born between 37 and 40 weeks is 2.7 to 4.1 kg or 6 to 9 lbs whereas exceptionally big babes weigh in average at 5.00 kg or 11 lbs.
In rivers and streams what causes sediment
Where is an anglerfish likely to be found
How are asthma hyperventilation and anaphylactic shock alike?