Answers
Answer:
This question lacks options, options are: A) Less action potentials are generated because sodium is needed to partially depolarize the neuron causing it to reach the threshold.B) More action potentials would be generated because sodium enters the neuron more quickly C)Fewer action potentials are generated because the neuron cannot be rose to the resting membrane potential D)Decreasing the permeability of sodium prevents the generation of action potentials because sodium cannot enter the cell to depolarize it. The correct answer is D.
Explanation:
Local anesthetics block the genesis and propagation of electrical impulses in electrically excitable tissues such as nervous tissue. When a nervous stimulus arrives, the depolarization of the membrane begins. The electric field generated activates the sodium channels (active state), which allows the passage of Na + ions, which en masse passes into the intracellular medium. Local anesthetics prevent the propagation of the nerve impulse by decreasing the permeability of the sodium channel, blocking the initial phase of the action potential, thus reducing the entry of Na + ion into the intracellular space. For this, local anesthetics must cross the nerve membrane, since their fundamental pharmacological action is carried out by binding to the receptor from the cytoplasmic side of it.
Related Questions
A park is rectangular with a length of 1/2 miles. If the area of the park is 6/8 square miles, what is its width? Input your answer as a fraction.
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Answers
Answer:
use ch.at gpt for homework answers
Explanation:
Let's denote the width of the park as "w" miles. According to the given information, the length of the park is 1/2 miles and the area of the park is 6/8 square miles.
The area of a rectangle is given by the formula: Area = Length × Width
Given that the length of the park is 1/2 miles and the area of the park is 6/8 square miles, we can set up the following equation:
1/2 * w = 6/8
To solve for "w", we can multiply both sides of the equation by 2 (to eliminate the fraction):
2 * (1/2 * w) = 2 * (6/8)
w = 12/8
Now, we can simplify the fraction w = 12/8:
w = (12 ÷ 4) / (8 ÷ 4)
w = 3/2
So, the width of the park is 3/2 miles.
Which of the following words describes the reality that the universe looks the same
from various perspectives
distribution pattern
cosmological
symmetrical
isotropic
Answers
Answer:
Isotropic
Explanation:
When astronomers look inside of a powerful telescope they were able to see that the universe looks the same in all directions. Isotropic is just another word for 'same in every direction' even if you stand in the center and look in every direction.
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What are the only pathogens that can be effectively treated with antibiotics?animal pathogensbacteriafungiprotozoaviruses
Answers
As we know in medicines, there is a wide range of types developed according to the ailment that were designed, so we have that for protozoans and animal pathogens antiparasitics are used, for viruses antivirals, meanwhile for bacteria are antibiotics, therefore the correct answer is second option.
Which of the following removes waste from the body through perspiration? blood kidneys skin large intestine
Answers
Answer:
Kidneys, skin and large intestine. Organs of excretion include the skin, liver, large intestine, lungs, and kidneys. All of them excrete wastes, and together they make up the excretory system. The skin plays a role in excretion through the production of sweat by sweat glands.
Explanation:
Answer: SKIN
Explanation: Perspiration is the process of sweating so your skin does that
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As one moves from left to right across the periodic table, what trend are evident?
A.) Atomic radius increases moving left to right
B.) Nonmetallic character increases moving left to right
C.) Electron affinity increases across the periodic table
D.) Elements change from solids to liquids and then gases.
E.) Most reactive elements on left and least reactive in n the right.
Answers
Answer:
C
Explanation:
Moving from left to right across a period, atoms become smaller as the forces of attraction become stronger. This causes the electron to move closer to the nucleus, thus increasing the electron affinity from left to right across a period. Electron affinity increases from left to right within a period.
What common features do eukaryotic mRNA share? Please use one of these features to describe how you can isolate eukaryotic mRNA from the cell extract. (limit your answers in 4 lines)
Answers
Answer:
A common feature in mRNAs that allow extraction from the cell is the 5' cap region which has a Guanine nucleotide attached to the mRNA in an atypical five prime to five prime triphosphate linkage.
Explanation:
The 5' cap structure serves to protect the mRNA against damage from RNA phages and an extraction protocol an be used to isolate the mRNAs from the cells. Reagents such as Dichloromethane, sodium hydroxide and diethyl ether in aqueous solution helps separate the organic layer, a silica-gel column can be used to further isolate the mRNAs
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Answers
5. Which of the following is accurate when discussing specific heat?
A. Specific heat values for solids will never vary for different ranges of temperature.
B. The specific heat of a gas can be measured at constant pressure.
C. Specific heat values for liquids will never vary for different ranges of temperature.
D. The specific heat of a gas can be measured at constant volume only.
Answers
When talking about specific heat, it is correct to say that a gas's specific heat may be determined at constant pressure. The correct option is B.
The amount of heat needed to increase a substance's temperature by 1 degree Celsius or Kelvin is known as its specific heat. The specific heat of a gas can be measured at constant pressure.
The specific heat for gases can be calculated at either constant volume or constant pressure. The heat capacity at constant pressure (Cp) and heat capacity at constant volume (Cv) are the terms used to describe the specific heat when measured at constant pressure and constant volume, respectively. For the majority of gases, Cp has a larger value than Cv.
Thus, the ideal selection is option B.
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Iron from the Blast Furnace is impure. It contains about 5% of impurities, mainly carbon, sulfur, silicon and phosphorus, which have to be removed when this iron is converted into steel. (a) Explain how the addition of oxygen and calcium oxide removes these impurities. Include an equation for a reaction of oxygen and a word equation for a reaction of calcium oxide in this process.
Answers
The addition of oxygen and calcium oxide removes these impurities by forming an oxide in elements Gaseous oxides in carbon dioxide and Acidic oxides in silicon Equation mark: S + O2 € SO2.
Word equation mark: calcium oxide + phosphorus(III/V) oxide = calcium phosphate.
Oxygen reacts with (all) elements or (all) contaminants. An M1 for any element that turns into an oxide. Multiples of A I state symbols I made other combustion equations imbalanced and used the wrong species. A proper symbol equation for M5, but R other equations that utilize erroneous species as M5 or that make all of the impurities into oxides.
Carbon dioxide or sulfur (di)oxide gases that are oxides of oxygen escape or are eliminated as gases. M3 Calcium oxide or lime reacts with or neutralizes acidic oxides like silicon(IV) oxide or phosphorus(III/V) oxide.
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Please Help
1. What gas do animals breathe in and what gas do they breathe out?
2. In sunlight, plants take in what gas and release what gas?
3. Without sunlight, plants take in what gas and release what gas?
Answers
Answer:
1. it takes in oxygen gas and releases carbon dioxide gas into the atmosphere
2. Plants take in carbon dioxide and release oxygen
3. Oxygen
Explanation:
6. Is the following statement, correct? If it is wrong, correct the statement
Statement: “Unicellular organisms do not respire, only multicellular organism respires
Answers
Answer:
The statement is false. Unicellular Organisms also respire.
Explanation: Respiration is the process by which an organism intales Oxygen and releases Carbon Dioxide along with energy in the form of ATP(Adenosine TriPhosphate). It is necessary for every organism. Hence Unicellular Organisms ALSO RESPIRE
Oh Scientists are using a control sample that is known to be from bighearted carp in an EDNA surveillance study. What purpose does this control serve?
Answers
Answer:
d
Explanation:
DNA has become a boon in surveillance programs that is used to monitor the presence of invasive species in the aquatic system and can monitor the presence of nucleic acid water even if the animals are not there
The cell membrane is mainly made up of lipids and proteins. It acts as a barrier to the surrounding environment. Which of the following statements about lipids BEST supports the argument that lipids help protect the contents of the cell?
Responses
Lipids that are placed in water do not dissolve.
Lipids that are placed in water do not dissolve.
The tail of a lipid is made of carbon and hydrogen.
The tail of a lipid is made of carbon and hydrogen.
Individual lipids in a membrane can rotate freely.
Individual lipids in a membrane can rotate freely.
Lipids are composed of a head and a thin tail
Answers
Lipids helps in protecting the contents of cell because it is hydrophobic , when placed in water they do not get dissolve.
There is a characteristic that unites the various chemicals that make up lipids. Insoluble in water, lipids are hydrophobic ("fear of water"). In a cell, lipids have a wide range of activities. Fat-like lipids, often known as lipid stores, are how cells keep energy for long-term use. For both plants and animals, lipids act as a barrier between them and their surroundings. As an illustration, their water-repellent properties aid in keeping aquatic birds and mammals dry. A significant component of the plasma membrane, lipids serve as the building blocks for numerous hormones. The several types of lipids are fats, oils, waxes, phospholipids, and steroids.
Thus, lipids cell membrane are the structural barrier of cell and helps in protecting its contents .
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does coal releases carbon dioxide into the atmosphere?
Answers
Answer:
yes
Explanation:
Coal is an important source of energy in the United States, and the Nation's reliance on this fossil fuel for electricity generation is growing. The combustion of coal, however, adds a significant amount of carbon dioxide to the atmosphere per unit of heat energy, more than does the combustion of other fossil fuels
Fossil fuels release greenhouse gases into the atmosphere, which increases levels of carbon dioxide and other gases, trapping heat, and contributing to global climate change. This means that coal does release greenhouse gases, like carbon dioxide and nitrous oxide, into the atmosphere.
What type of gas is a source of air pollution?
O oxygen
O helium
O carbon dioxide
O carbon monoxide
Answers
what is the analogy between the vacuole and a school?
Answers
Answer:
The vacuoles is like the cabinets in the school used to store items. where we release all of our energy. Cytoplasm is like the hallways of the school.
At any given time, a 4-acre field contains an average of 200 kg dry weight of mallow plants. For these calculations, assume that the food chain shown below is isolated and that there are no other predators or sources of food involved. mallow plant- painted lady butterfly - phoebe- fox Assume that the dry weight of each animal is on average as indicated below Painted lady butterfly 0.1g Phoebe 48 Fox 1 kg (1000 g) a. Assuming that 10% of the biomass, as measured in dry weight, is transferred from one trophic level to the next higher level, calculate how many foxes the field could support at any given time. Show your work and include in your calculations how many phoebes and painted lady butterflies the field could support b. Construct a biomass pyramid diagram depicting the food chain described above. Include only the organisms of the food chain that the 4-acre field will support, and label the trophic level occupied by each organism. The units in your pyramid should be grams per square meter (g/m?) (Note: 1 acre = 4046.86 m).
Answers
a. The 4-acre field will support a total of 200 g foxes at any given time.
b. The pyramid is attached.
How to calculate support for food chain?a. To calculate the number of foxes that the field could support at any given time, we need to work our way up the food chain, starting with the mallow plants:
200 kg of mallow plants x 10% = 20 kg available to painted lady butterflies
20 kg of painted lady butterflies x 10% = 2 kg available to phoebes
2 kg of phoebes x 10% = 0.2 kg available to foxes
Now to convert kg to g to make the calculations easier:
200 kg = 200,000 g of mallow plants
0.1 g per painted lady butterfly x 20 kg of painted lady butterflies = 2000 g = 2 kg
48 g per phoebe x 2 kg of phoebes = 96,000 g = 96 kg
1000 g per fox x 0.2 kg of foxes = 200 g
Therefore, the 4-acre field could support approximately 200 g of foxes at any given time.
b. The biomass pyramid diagram is attached below.
To convert from kg per acre to g per square meter, multiply by a factor of 24.711 (since there are approximately 4046.86 square meters in an acre).
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what product is left over after photosynthesis
Answers
Answer:
glucose/sugar
Explanation:
Hope this helps!
Answer:
Im pretty sure the oxygen is released from leaves while the energy contained within glucose molecules
Explanation:
why might a rock layer not contain any fossils?
Answers
The rock layer may have formed before life existed or may have eroded away any existing fossils.
There are a few reasons why a rock layer may not contain any fossils. One reason is that the rock layer may have formed before life existed on Earth, such as in the case of igneous rocks that form from volcanic activity.
Another reason is that the rock layer may have formed in an environment that was not conducive to preserving fossils, such as a high-energy riverbed or a desert.
Additionally, the rock layer may have been eroded away over time, destroying any existing fossils. Finally, it is possible that fossils were present in the rock layer but were not discovered or identified during the excavation process.
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Bacteria, like most forms of life use ___ to reduce the activation energy of metabolic reactions.
select all correct answers
Bacteria, like most forms of life use ___ to reduce the activation energy of metabolic reactions.
select all correct answers
catalysts
resonance structures
entropy
photons
enzymes
Answers
Answer:
Catalysts, enzymes
Explanation:
Catalysts are known for reducing the activation energy of a reaction thus increasing the reaction rate.
Enzymes are a type of catalyst.
How are all animals like as heterotrophs?
All animals have multiple cells.
All animals are made up of cells organized into tissues.
All animals have two copies of each chromosome.
All animals need food to survive.
Answers
Answer:
All animals need food to survive.
Explanation:
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Answers
The location of transcription is nucleus, it is the conversion of DNA to m-RNA and it occurs first in the sequence. The location of translation is ribosome, it is the conversion of m-RNA to protein and it occurs later in the sequence.
Ribosome is a nucleoprotein. It is a machinery designated for the synthesis of protein. The ribosome can be found freely lying on the cytoplasm or it can be attached to the wall of ER forming the rough ER. There are two subunits of ribosome: a smaller subunit and a larger subunit.
m-RNA stands for messenger RNA. It is the coding RNA that carries the information of DNA and encodes it for the synthesis of protein. m-RNA is a single-stranded molecule.
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8. Albinism ( lack of pigment) in humans is caused by a recessive gene. If normal parents have an albino child,
what is the probability that their next child will be normal for pigment color?
Show the Punnett Square
Answers
Two charged particles are shown below. Particle A has a charge of –3.0 × 10–5 C. Particle B is located 3 cm directly to the left of Particle A and has a charge of +4.0 × 10–5 C. Compare the magnitude and direction of the electrostatic force acting on Particle B to the force acting on Particle A.
Answers
The direction of the force acting on Particle A is towards Particle B.
The electrostatic force between two charged particles is given by Coulomb's law:
Which states that the force between two charges is proportional to the product of their charges and inversely proportional to the square of the distance between them.
The magnitude of the force acting on Particle B is given by:
F = k * |q1 * q2| / r^2
where k is the Coulomb constant (8.99 × 10^9 Nm^2/C^2), q1 and q2 are the charges of Particles A and B, r is the distance between them.The magnitude of the force acting on Particle B is:
F = 8.99 × 10^9 * |-3.0 × 10^-5 * 4.0 × 10^-5| / (0.03)^2 = 3.24 × 10^-5 N
The direction of the force acting on Particle B is towards Particle A, since the charges have opposite signs.
Similarly, the magnitude of the force acting on Particle A is
F = 8.99 × 10^9 * |-3.0 × 10^-5 * 4.0 × 10^-5| / (0.03)^2 = 3.24 × 10^-5 N
The direction of the force acting on Particle A is towards Particle B.
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a. What is the normal value of hemoglobin in adult males and adult females ?
Answers
Answer: Female is 12.1-15.1 g/dL or 121-151 g/L
Male is 13.8-17.2 g/dL or 138-172 g/L
Explanation:
1.La energía es la capacidad de un cuerpo para producir trabajo.
2.La energía se clasifica solamente en renovables.
3.Las ondas se pueden propagar en un medio o un espacio vacío.
4. Las ondas se pueden clasificar en longitudinales y transversales.
5. La energía cinética es aquella que se encuentra en movimiento.
6. El núcleo de la Tierra está formado
por metales, principalmente hierro y níquel, y en menor
cantidad por azufre y oxígeno.
7. La corteza terrestre está compuesta por rocas
8. La contaminación se puede
definir como la presencia o acumulación de sustancias en el medio ambiente
que afectan negativamente el entorno.
9. Los elementos de la tabla periódica se clasifican de acuerdo con sus propiedades y características
similares.
II. Escoge
1. Son fuentes de energías renovables:
2. Son fuentes de energías no renovables:
3. Partes de las ondas:
15. La ciencia que estudia los seres vivos es:
16. En la biotecnología se incluyen las áreas de:
17. Consiste en la liberación de sustancias químicas a la atmósfera que alteran su composición.
18. Se debe a la presencia de desechos en el agua. La contaminación de mares, ríos y lagos se produce por
las actividades del ser humano.
19. Se debe a la acción humana (los residuos y la basura arrojada en cualquier superficie terrestre).
20. Cuando el contaminante es una sustancia química que procede normalmente de los usos industriales.
21. Surge con la emisión de fluidos a elevadascontaminación.
22. La actividad humana produce mucho ruido, y los altos decibelios en un determinado lugar por encima de sus niveles naturales marcan la contaminacion.
Answers
Answer:
La actividad humana produce mucho ruido, y los altos decibelios en un determinó do lugar por encima de sus niveles naturales marcan la contaminación.
Explanation:
Creo que es la respuesta
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Answers
Answer:
I don’t understand your question
Explanation:
Which of the following events takes place during the mitotic phase of the cell cycle?
O Duplication of DNA
Duplication of
DNA
Duplication of
centrioles
Which of the following events takes place during the mitotic phase of the cell cycle?
Separation of Chromosomes
Duplications of centrioles
Division of Cytoplasm
Separation of
chromosomes
Division of
cytoplasm
Answers
The events that takes place during the mitosis are separation of chromosomes, duplication of centrioles, division of cytoplasm, separation of chromosomes and division of cytoplasm.
Phases of mitosisThe majority of the cell's life is spent in the interphase, just before prophase, where mitosis's start-up is prepared for (the DNA is copied). The prophase is technically the first phase of this process, though, because the actual process requires the division of the nucleus. The duplicated chromosomes are aligned, separated, and transferred to the cell's opposite poles during the multistep mitotic phase, after which the cell divides into two brand-new, identical daughter cells.The cell divides its cytoplasm and divides its DNA into two sets during the mitotic (M) phase to produce two new cells.For more information on mitosis kindly visit to
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Which of the following is an organic molecule?
Answers
Answer:
The correct answer is methane . Nature constitutes most of the substances made up of organic compounds. These compounds have carbon atoms attached with hydrogen atoms with a chemical bond (very few compounds may not have this bond).
Explanation:
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The are the plants, algae, and other organisms that can make their own food.
Answers
Autotrophs are plants, algae, and other organisms that can make their own food.
These organisms are called autotrophs, which translates to "self-feeders." Autotrophs play a crucial role in ecosystems as primary producers, forming the foundation of food chains and providing sustenance for other organisms. Photosynthesis is a complex biochemical process that occurs in the chloroplasts of plant and algal cells.
It involves the conversion of light energy from the sun into chemical energy in the form of glucose. Autotrophs accomplish this by utilizing pigments, primarily chlorophyll, to absorb light energy. During photosynthesis, autotrophs take in carbon dioxide from the atmosphere and water from the environment. With the aid of sunlight, these raw materials are transformed into glucose and oxygen.
Glucose serves as an energy source for organisms, while oxygen is released back into the atmosphere as a byproduct. This ability to synthesize their own organic compounds from inorganic substances gives autotrophs a distinct advantage.
Autotrophs exist in various forms, including land plants, such as trees, grasses, and flowers, as well as aquatic plants like seaweeds and pond algae. Additionally, certain bacteria and protists are capable of photosynthesis, broadening the range of autotrophic organisms.
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