Answer:
The formation of fresh areas of oceanic crust which occurs through the upwelling of magma at mid-ocean ridges and its subsequent outward movement on either side.
The lipid bilayer membrane of a neuron is impermeable to charged molecules or ions. To enter or exit the neuron, ions must pass through special proteins called ion channels that span the membrane. Ion channels have different configurations: open, closed, and inactive. Some ion channels need to be activated in order to open and allow ions to pass into or out of the cell. Which ion channels are used in the production of electrical signals (Action Potential) in neurons
Answer:
The correct answer is: in neurons, the most used ion channels in the production of action potentials are the channels that allow fo passage of sodium and potassium.
Explanation:
Neurons must be able to transmit and receive signals in order for the nervous system to operate. Because each neuron has a charged cellular membrane (a voltage differential between the interior and the exterior), the charge of this membrane can vary in response to neurotransmitter molecules generated by other neurons as well as external stimuli. The membrane potential is the difference in total charge between the interior and outside of the cell. This membrane potential exists thanks to the state of ion channels that may or may not allow the passage of certain ions.
A substance called a neurotransmitter allows a neuron to accept input from other neurons. The neuron will transmit the signal to downstream neurons if the input is powerful enough. The opening and shutting of voltage-gated ion channels, which produce a transient reversal of the resting membrane potential to form an action potential, are used to transmit a signal within a neuron (in one direction only, from dendrite to axon terminal). The polarity of an action potential changes across the membrane as it travels down the axon. The signal then activates other neurons once it reaches the axon terminal.
The target neuron is depolarized to its threshold potential (-55 mV) by a stimulation from a sensory cell or another neuron, and Na+ channels in the axon hillock open, initiating an action potential. The neuron totally depolarizes to a membrane potential of around +40 mV after the sodium channels open. As Na+ channels open, the action potential moves along the neuron.
The cell's membrane voltage is "reset" to the resting potential after depolarization is complete. The Na+ channels shut, signaling the start of the refractory phase in the neuron. Voltage-gated K+ channels open at the same moment, allowing K+ to escape the cell. The membrane potential returns to a negative state as K+ ions exit the cell. The cell becomes hyperpolarized when K+ diffuses out of it, resulting in a membrane potential that is lower than the cell's usual resting potential. The sodium channels revert to their resting state at this moment, ready to open again if the membrane potential rises over the threshold potential again.
What type of data is represented by the following example:
The sound of the frog's croak is louder than the sound of the cricket's chirp.
informative data
O qualitative data
O managed data
O quantitative data
Answer:
O qualitative data
Explanation:
Statistically, there are two major types of data namely: quantitative data and qualitative data. Quantitative data are those kinds of data that has to do with numbers and figures expression. For example, the length of a millipede measures 14cm etc.
On the other hand, qualitative data also called descriptive data are kinds of data that basically gives information about or describe a scientific observation. They are not numerical and hence cannot be measured. Example is the observation that the sound of the frog's croak is louder than the sound of the cricket's chirp.
What is a truck's acceleration if the net external force on the truck is 560 N and it has a total of mass of 1000 kg?
Answer:
0.56m/s²
Explanation:
The above is the correct answer.
Force = mass x acceleration = mg
⇒ F = mg
where F = 560 N, m = 1000kg
∴ g = F/m = 560/1000 = 0.56
∴ acceleration, g = 0.56m/s² (answer)
Force is known to be a push or a pull which actually puts a body to motion or brings a body to rest. It has to do with the interaction between bodies.
consider the differences in solids, liquids and gasses, and their surface area. which state of matter do you think would usually have the greatest rate of reaction, and why?
Answer:
el que tendrá mayor velocidad de reacción son los líquidos
Explanation:
Please help ASAP thank you
Answer:
They will have A or answer choice C
Explanation:
Which two factors cause one part of Earth to have summer while another part
has winter?
Answer:
The earths axis
Explanation:
For the earth being on its axis causing it to be on the side so while one side is getting heat the other gets cold this also cause the days to change
Which organism is an animal-like protist?
cilia
dinoflagellate
amoeba
truffle
Answer:
✅ C. amoeba
just took the test
The organism that is an animal-like protist is the amoeba.
What are amoebas?Amoebas are a group of single-celled organisms belonging to the phylum Amoebozoa. They are classified as protists, which are a diverse group of eukaryotic microorganisms that do not fit into the categories of plants, animals, or fungi.
Amoebas are characterized by their ability to move and change shape through the use of pseudopodia, which are temporary extensions of their cell membrane. These extensions allow amoebas to engulf and surround their food, typically consisting of bacteria, algae, or other small organisms.
Amoebas are single-celled protists that move using pseudopodia, which are temporary extensions of their cell membrane. They are classified as animal-like because of their ability to move and capture food in a similar manner to animals. Amoebas belong to the phylum Amoebozoa and are commonly found in freshwater and soil environments.
The correct answer is amoeba.
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what is the role of the cerebrospinal fluid provides cushioning for the brain maintain a stable ionic concentration in the cns provides a pathway to the blood for waste
Answer:
The correct answer is - provides cushioning for the brain.
Explanation:
The cerebrospinal fluid or CSF is a clear colorless fluid that is present within the tissue that surrounds the spinal cord and the brain of all vertebrates. The major and main role or function of CSF is to provide a cushion to the brain within the skull and acts as a shock absorber from the outer world impact for the central nervous system.
Other than providing a cushion for the most sensitive body part brain, CSF also transports nutrients and chemicals filtered from the blood and removes waste products from the brain.
If a mutation occurs in the coding sequence of a gene, what types of
issues might happen?
Select one:
A) All of these answers.
B) The gene could be expressed in the wrong cell.
C) The gene could be unaffected.
D) The gene could be permanently broken.
Answer:
A
Explanation:
It will be all because of the fact that mutation does sometimes harm the genes and cells so any types of issues might happen
Will a lunar eclipse be visible from every place on Earth that is facing the moon? Explain the reasoning behind your answer.
Answer:
It's true that the Moon goes around Earth every month, but it doesn't always get in Earth's shadow. The Moon's path around Earth is tilted compared to Earth's orbit around the Sun. The Moon can be behind Earth but still get hit by light from the Sun. ... Unlike solar eclipses, lots of people get to see each lunar eclipse.
Explanation:
if u like this answer plz mark as brainlist and follow me
please tell me the answer
Answer:
1)the process being studied in the picture is transpiration I guess
3)the pot is covered with plastic sheet to trap the water (vapour) which is being evaporated
why glucose need to returned to the blood
Match the surface to its respective albedo score. fresh snow soil ocean (high-angle sun) ocean (low-angle sun) 0.95 arrowRight 0.2 arrowRight 0.9 arrowRight 0.05 arrowRight Reset Next
Answer:
fresh snow → 0.9soil → 0.2ocean (high-angle sun) → 0.05ocean (low-angle sun → 0.95Explanation:
Albedo is the radiation reflected by the earth´s surface to the universe.
Albedo might be defined as a relation between reflected light from a particle and the incident light. It is the fraction of the incident radiation that is reflected by any object. If the surface is mostly clear and clean, most of the incident radiation is reflected. But if the surface is dark and rugose, most of the incident radiation is absorbed, and the temperature of the absorbing object will increase.
Albedo value is always inferior or equal to one and can be expressed as a percentage. The surface that reflects 100% of the incident light will have an albedo value = 1. But if the surface absorbs all the radiation and does not reflect any percentage, the albedo value = 0. Note: there is no real object that might reflect or absorb 100% of the incident radiation.
The importance of albedo is that it avoids high temperatures on the earth. There are many different surfaces with different albedo values. Global variations in albedo are natural processes due to exogenic and endogenic variations. But to these natural events, we must add all the variations caused by human beings´ actions, which increase greenhouse gases, decreasing albedo, and increasing global warming. The increase of greenhouse gases, such as CO₂, decreases albedo. The same occurs with atmospheric dust due to volcanic eruptions. Additional material interposes between the earth´s surface and the universe, decreasing the energy return to the universe.
fresh snow → 0.9 soil → 0.2ocean (high-angle sun) → 0.05ocean (low-angle sun → 0.95
e)Name the force provided by the leaves of tall trees which draws
more water due to adhesion.
Answer:
Capillary action
Explanation:
Capillary action helps bring water up into the roots. With the help of adhesion and cohesion, water can work it's way all the way up to the branches and leaves. Read on to learn more about how this movement of water takes place.
Surtsey is a volcanic island that was formed off the coast of iceland in the 1960s. After the eruption that created the island, organisms slowly arrived and grew on the island. The first organisms were some bacteria and fungi. Within about two years, the first vascular plants had arrived and by the end of the first decade there were 10 species of vascular plants on the island. Forty years later, there were about 60 species of vascular plants. What is likely true about this situation
Answer:
The first organisms were some bacteria and fungi.
Explanation:
The first organisms were some bacteria and fungi on the Island of Surtsey because these bacteria and fungi are present in the surrounding air which can easily reach to that Island. The bacteria and fungi make the environment favourable for the growth of plants and animals. These bacteria and fungi ready the ground for the plants so that they can grow easily with the passage of time.
Surtsey an volcanic islandic island lies in V. archipelago that is the southern coast of island. It was created by a volcanic eruption at 130 meters below sea level.
After the eruption of the volcano on the island, some vascular plants have been found to grow on the northern shores. Mosses were found in 1967. and the lichens were the first to be found. Now the island is covered by the presence of mosses and lichens. This shows within about two years, the first vascular plants had arrived and by the end of the first decade, there were 10 species of vascular plants on the island.Learn more about the volcanic island that was formed off the coast.
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When two plants, both tall, were crossed, they produced some offspring that were dwarves. Assuming that the height of the plant is controlled by a single gene and the allele for the tall plant is dominant, what is the genotype of the parents? A. TT and TT B. TT and Tt C. Tt and tt D. Tt and Tt
Answer:
B for plato users
Explanation:
If both plants are tall and produce some offspring that are dwarfed, it indicates that both parents must have been heterozygous for the height gene. The genotype of the parents is most likely Tt and Tt. Hence option D is correct.
What is a genotype?A genotype is the genetic makeup of an organism, which is determined by the combination of alleles (different forms of a gene) inherited from its parents. Genes are located on chromosomes and each individual has two copies of each gene, one inherited from each parent.
The genotype of the tall plants could be either homozygous dominant (TT) or heterozygous (Tt), as both genotypes would result in a tall phenotype.
Therefore, the possible genotypes of the parents are:
Tall plant 1: TT or Tt
Tall plant 2: TT or Tt
If we assume that both plants were heterozygous (Tt), then the Punnett square for the cross would be:
T t
T TT Tt
t Tt tt
As we can see, there is a 25% chance of producing dwarf offspring (tt) when two heterozygous plants are crossed. This result matches the observation in the problem, so the genotype of the parents is most likely Tt and Tt (option D).
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what are the types of human grafts.somebody help
A point mutation that changes a codon specifying an amino acid into a new codon coding another amino acid is called: a. Deletion mutation. b. Missense mutation. c. Nonsense mutation. d. Frameshift mutation.
Answer:frame shift
Explanation:
How can an allele frequency
increase?
A. Allele frequencies always stay the
same.
B. Random mating occurs within the
population
quency
C. An allele becomes more common in a
population.
Answer:
C
Explanation:
Natural Selection can cause micro evolution, or a change in allele frequency over time
An allele becomes more common in a population. So, the correct option is (C).
What is an Allele Frequency?Allele frequency is also known as gene frequency. It is defined as the relative frequency of an allele at a particular locus in a population, expressed as a fraction or percentage. It is the fraction of all chromosomes in the population that carry that allele over the total population or sample size.
It forms the basis of many population and medical genetic studies. Many evolutionary forces change allele frequencies where allele frequencies can be used to trace past evolutionary events.
Allele Frequency is expressed as:
[tex]1 = p^2 + 2pq + q^2[/tex]
p and q each represent the allele frequency of different alleles.
Thus, an allele becomes more common in a population. So, the correct option is (C).
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Which neurons transmit information from the
central nervous system to muscles and glands?
(a) Sensory neurons
(b) Interneurons
(c) Motor neutrons
(d) Bipolar neurons
Answer:
C
Explanation:
the motor neuron branches from the central nervous system to the effector which can be the muscle or gland
I hope this helps
Why did heating the water affect the surface? I need help my mother is making me di science and im so confused :( I doubt this is biology..
Changes in the surface temperature heat or cool the air above, which leads to air movement (wind). Solar heating of the Earth's surface is uneven because land heats faster than water, and this causes air to warm, expand and rise over land while it cools and sinks over the cooler surfaces.
can someone please help me and when answering pls tell me what x is
Which is an important difference between light-dependent (L-D) and light-independent (L-IND) reactions in photosynthesis?
Answer:
The L-D reactions require light energy and water, and the L-IND reactions require ATP, NADPH and CO2.
Explanation:
two example of viruses
Answer:
Trojanic bomb.
Polymorphic virus.
Boot sector virus.
Question 2 of 25
A sodium atom that has lost an electron comes near a chlorine atom that has
gained an electron. What happens?
A. They form a peptide compound.
B. They form a hydrogen bond,
O C. They form a covalent bond.
D. They form an ionic compound.
PREVIOUS
Answer:
D. They form an ionic compound.
Explanation:
The bonds which are produced between a metal ion and a non-metal ion are termed as ionic bonds.
IN YOUR OWN WORDS, what is the definition for Down Syndrome?
Answer:
A common birth defect that is usually due to an extra chromosome 21( trisomy 21) .
An essential amino acid can be synthesized in the body if caloric intake is adequate. cannot be synthesized in the body in sufficient quantity to meet body needs. can be formed in the body from nonessential amino acids. can be synthesized in the body if there is a nitrogen source.
Answer:
cannot be synthesized in the body in sufficient quantity to meet body needs.
Explanation:
Amino acids are defined as the structural units which make up the proteins in our bodies. They help to break down foods, repair tissues, and serves many more functions.
Our body is not capable of making the essential amino acids that are required by the body. They should be come from the food we eat. And hence the essential amino acids cannot be synthesized in our body in the sufficient quantity to meet our body needs.
whole meal bread, banana,lattuce and cabbage are a good source of
Answer:
they are good source of fibre
What is life please explain
Answer:
the existence of an individual human being like you and me and all of us life can also add up animals
Musculo que tiene las características tanto de musculo esquelético como de musculo liso. Se encuentra en el corazón y sus contracciones son involuntarias
Answer:
músculo cardíaco
Explanation:
Los 3 tipos de tejido muscular son 1-músculo cardíaco o miocardio (involuntario), 2-músculo liso (involuntario) y 3-músculo esquelético (voluntario). Las células del músculo cardíaco, las cuales son conocidas como 'miocardiocitos', poseen una apariencia estriada y forman la pared del corazón. Los miocardiocitos son alargados, ramificados, y poseen un núcleo central (son células uninucleadas, a diferencia de las células del músculo esquelético, las cuales son multinucleadas). Además, los micardicitos son más cortos (80 a 100 µm) y más anchos (aprox. 15 µm) que las células del músculo esquelético. Los miocardiocitos presentan uniones especializadas conocidas como discos intercalares, los cuales son un tipo de complejo de unión entre los límites de dos cardiomiocitos. En el citoplasma de los cardiomiocitos se encuentran las miofibrillas, las cuales son estructuras contráctililes que les confieren a las células musculares sus propiedades características de contracción y de elasticidad. En estas células (cardiomiocitos) las miofibrillas se disponen de manera longitudininal con un patrón estriado.
