Answer:
Your hand movement sends signals to the brain which tells you what you want to do and directs you to doing that.
Can i get brainliest?
Petting a dog leads to the releases of oxytocin that keeps your hand muscles petting the dog.
What is te nervous system?The nervous system is the system of the body that coordinates electrical impulses to the brain. The sense organs are directly connected to the nervous system.
If you start petting a dog, oxytocin is realeased that enhances your conection to the dog causing the muscles in your hand to continiue pettining the dog.
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Why are action potentials usually conducted in one direction?
A) The nodes of Ranvier can conduct potentials in only one direction.
B) The brief refractory period prevents reopening of voltage-gated Na+ channels.
C) The axon hillock has a higher membrane potential than the terminals of the axon.
D) Ions can flow along the axon in only one direction.
E) Voltage-gated channels for both Na+ and K+ open in only one direction.
Answer:
B) The brief refractory period prevents reopening of voltage-gated Na+ channels.
Explanation:
Refractory period is a period during which neuron cell cannot be stimulated (depolarized) and this is why action potential does not re-stimulate the adjacent membrane that was previously depolarized. This is also the reason action potential can only travel in one direction from the neuron body towards axon.
Refractory period occurs because of the inactivation of voltage-gated sodium channels (while action potential is at its peak) which cannot be open for a certain period of time. and membrane cannot be depolarized.
Action potentials in neurons are usually conducted in one direction because of the refractory period - a brief period when the sodium channels cannot reopen, preventing another action potential from being initiated at that point. This ensures that action potentials move from the cell body and down the neuron's axon.
Explanation:The action potentials in neurons are usually conducted in one direction because of the refractory period that follows the firing of an action potential. In simple terms, after the neuron fires, there's a brief period - the refractory period - when the sodium channels cannot reopen. This is option B: The brief refractory period prevents reopening of voltage-gated Na+ channels. Therefore, once an action potential has passed a certain point along an axon, that part of the neuron briefly cannot initiate another action potential. This ensures that action potentials move in one direction along the nerve fiber: from the cell body and down the axon.
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Where does the primary source ofWhere does the primary source of energy needed for life come from? solar energy geothermal energy nuclear energy kinetic energy energy needed for life come from?
Answer:solar energy
Explanation:
Answer: Solar energy
Explanation:
The primary source of energy is sun. The only source of energy that is required for all the living beings on earth is sun.
The energy is present in the form of radiant energy which is converted into other forms depending on the microorganism converting it.
Plants, animals and many other microorganism use this energy to survive.
Which materials preserve soft tissues in fossils? Check all that apply.
amber
minerals
permafrost
sediment
tar
Answer:
The answer is Amber, Permafrost, and Tar
Explanation:
Answer:
a c e
Explanation:
Which statement is true?
Answer:
D
Explanation:
D
An opinion can be based on personal views, judgement and/or beliefs and may be incorrect. (It’s like saying that you think cucumbers are the best veggie but that’s just an opinion.)
Scientific theories change all the time based on new information (remember when people thought the sun revolved around us).
Scientists are constantly learning more about everything in the universe (I mean we literally just got a picture of a black hole like a month ago)
but facts can be scientifically tested and are in order to make sure that it is a fact because by definition a fact is “something that is known to be consistent with objective reality and can be proven to be true with evidence”
That makes D correct
The term extinction applies to the eradication of an entire
A) organism.
B) species.
Eliminate
C) community.
D) ecosystem.
Answer:
B
Explanation:
Extinction is a term used for animals when they are no longer in existence.
B. Species
Species is specific to going extinct.
PLS HELP RN!! Which statements describe Newton and the law of universal gravitation? Check all that apply.
- Newton believed that gravity was a force.
- The law of universal gravitation states that gravity is the force that keeps birds in flight.
- The law of universal gravitation offers a mathematical explanation for the attraction between the moon and Earth.
- Newton was the first to have the idea that gravity is everywhere.
- Gravity is measured in masses.
The answers are:
Newton believed that gravity was a force. The law of universal gravitation offers a mathematical explanation for the attraction between the moon and Earth. Newton was the first to have the idea that gravity is everywhere.Newton is known as the father of modern science for many reasons including his work on gravity. Thanks to Newton we found out that:
gravity was a forcegravity is the reason the moon is attracted to the Earthgravity is everywhereIn conclusion, Newton's work on gravity helped us realize just how important the force was and how extensive its reach is as well.
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Newton formulated the law of universal gravitation, which states that gravity is a mutual force of attraction between any two masses. The law is mathematically expressed as F = Gm₁m₂/r². Newton's law demonstrates the gravitational force both on Earth and in celestial movements.
Sir Isaac Newton formulated the law of universal gravitation, expressing the idea that the gravitational force is a mutual force of attraction between any two masses, which is foundational for classical mechanics. The correct statements that describe Newton and this law are:
Newton believed that gravity was a force.The law of universal gravitation offers a mathematical explanation for the attraction between the moon and Earth.Newton was the first to propose an exact mathematical form (F = Gm₁m₂/r²) for the gravitational force.The law does not state that gravity is the force that keeps birds in flight, and gravity isn't measured in masses but rather as a force (in newtons, in the SI unit system). Also, while Newton wasn't necessarily the first to suggest that gravity is everywhere, he was the first to define it precisely and demonstrate that it governs both terrestrial and celestial phenomena.
Youre an athlete who chokes during a competitive event. which stage of the stress process is this? stage 1 stage 2 stage 3 stage 4 stage 5
Is it stage 4 I'm guessing
stage 4 because the first three stages aren’t stress and the fifth one is death
One of the major categories of receptors in the plasma membrane reacts by forming dimers, adding phosphate groups, and then activating relay proteins. Which type does this?
A) chemically-gated ion channels
B) G protein-linked receptors
C) cytoplasmic receptors
D) protein kinase receptors
Answer:
D) protein kinase receptors
Explanation:
Protein kinase receptors are simply saying receptors with associated kinases (usually tyrosine kinases).
Protein kinases are enzymes that have the ability to modulate other enzymes (or some other proteins) by adding the phosphate group. This is known as phosphorilation process. As a result of structural change, protein can change its activity (phosphorilation usually increase the activity).
Such receptors are involved in a many signaling cascades.
The receptors that react by forming dimers, adding phosphate groups and activating relay proteins are the protein kinase receptors. These receptors respond to ligand binding by dimerization and phosphorylation triggering a cascade of cellular responses.
Explanation:The major category of receptors in the plasma membrane that reacts by forming dimers, adding phosphate groups, and then activating relay proteins is the protein kinase receptors. These receptors are known for their enzymatic activity that activates a cascade of events inside the cell. The process begins when a ligand, or a signaling molecule, binds to the receptor. This binding induces the dimerization (pairing of two receptor molecules), followed by the addition of phosphate groups to certain amino acids within the receptor. This phosphorylation activates the receptor and triggers the activation of other proteins within the cell, leading to a series of cellular responses.
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Which ones, multiple answers
Answer:
The true answers are,
All Scientific endeavors are supported by evidence
All Scientific endeavors involve observation
All Scientific endeavors involve experimentation
All Scientific endeavors involve collection of information
Explanation:
Scientific endeavors are the work or attempts done by scientists.
False statements:
All scientific endeavors are time consuming is not true because due to modern technology there are several things we can do without spending much time. All scientific endeavors are expensive is also not true. All scientific endeavors are a systemic process is not true because during scientific experimentation the outcome of these experiments will determine the next step. we can not make a concrete plan for a scientific endeavor, however we may predict something.
True statements:
Weather we get a positive result of negative result of a scientific endeavor it is always supported by an evidence and these results are obtained by observations and experimentation. Finally the collection of information is very important to prove the results.
A(n) ________________________________ represents the relative amount of energy in the different trophic levels of
Answer:
ecological pyramid
All of the statements EXCEPT one are true about mutations. Which statement is false?
A) Mutations must be present in parents and then passed to offspring.
B) Mutations can be positive and produce organisms with improved traits.
C) Mutations can be fatal to the organism that has a mutation, if the mutation is in a critical gene.
D) Mutations can be silent, and not affect the organism that has them, if the mutation is in a non-critical area.
Answer:
A
Explanation:
Parents do not need to have the mutation for their offspring to have it. Mutations can be present even without the parent having it.
Answer:
A is false
Explanation:
Mutation is a change that occurs in the DNA nucleotide sequence either due to mistakes when DNA is copied during cell division or as a result of environmental factors e.g. UV radiation.
Since all the cells of an organism contains DNA, there are lots of places mutation can occur. However, some mutations are not passed from parents to offsprings and do not matter for evolution. This form of mutation is called Somatic or acquired mutation and it occurs in non-reproductive cells. Hence, won't be passed down from parents to offsprings. This form of mutation majorly occurs when DNA cells get replicated during mitosis or when the cell is exposed to harsh environmental factors that damages DNA strands e.g Ultraviolet radiation.
Mutations are only hereditary i.e can be passed down from parents to offsprings, if they occur in reproductive cells (sperms and eggs). This kind of mutation is called Germ-line mutation.
According to the question, mutations must not always occur in the parents before an offsprings DNA undergoes mutation.
The exchange of carbon dioxide and oxygen in the alveoli of the lungs is an example of what?
The exchange of carbon dioxide and oxygen in the alveoli of the lungs is known as pulmonary gas exchange, which is achieved through diffusion based on partial pressure differences. This process is part of external respiration and is essential for providing oxygen to the bloodstream and removing carbon dioxide from the body.
Explanation:The exchange of carbon dioxide and oxygen in the alveoli of the lungs is an example of pulmonary gas exchange. This process is vital for respiration and involves the transfer of gases with the external environment. It primarily occurs through diffusion, driven by partial pressure differences between the alveoli and the blood in the pulmonary capillaries. Oxygen diffuses from the alveoli, where it is highly concentrated, into the blood, where its concentration is lower. Conversely, carbon dioxide diffuses from blood, where it is more concentrated, into the alveoli to be expelled.
External respiration is this very exchange that happens in the lungs. While at the same time, internal respiration takes place in the body's tissues, where oxygen is used and carbon dioxide is produced. The lung anatomy, including a large surface area and very thin respiratory and blood capillary membranes, maximizes the efficiency of gas exchange. No energy is required, as the gases move across the membranes that are highly permeable to them, following the natural pressure gradients.
A vector is an organism that transfers a pathogen to a host. in the case of malaria, the vector(s) is(are) ______.
Answer:
Anopheles mosquitoes only
Which type of muscle tissue is multinucleate, striated, and unbranched? see section 45.2 ( page 948) ?
Answer:
skeletal muscle tissues
Explanation:
Penetrance specifically refers to the expression of lethal genes in heterozygotes. True or False
Answer:
False
Explanation:
WILL GIVE BRAINLIEST!!!
A serious eye disease was noticed in the common house finch. After investigation, researchers discovered that the bacterium, Mycoplasma gallisepticum, was found present in the affected birds. Design an investigation and describe how you would determine if the bacterium affected the population size of the house finch. Include in your explanation the data you would collect, what patterns you would look for as you analyzed the data, and the type of relationship that exists between the birds and the bacterium.
Microbes may be tiny, but that doesn’t stop some of them from causing major destruction. Even supervillains like Lex Luthor or Doctor Doom were never able to pull off as much devastation as the bugs that cause bubonic plague or malaria. It turns out it’s hard to find a good opportunity to study harmful, contagious diseases. It’s just not safe. One option is to study an epidemic that doesn’t affect humans—but then it’s hard to track the disease, since animals don’t check into hospitals.
The answer is Pathogenic parasites.
Relationship type that exists between the birds and the bacterium:
Microbes may be tiny, but that doesn’t stop some of them from causing major destruction. Even supervillains like Lex Luthor or Doctor Doom were never able to pull off as much devastation as the bugs that cause bubonic plague or malaria. It turns out it’s hard to find a good opportunity to study harmful, contagious diseases. It’s just not safe. One option is to study an epidemic that doesn’t affect humans—but then it’s hard to track the disease, since animals don’t check into hospitals.
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____ will develop pharyngeal arches. ____ will develop a postanal tail in the embryonic stage.
Answer:
The answer to the question: ___ will develop pharyngeal arches. ___ will develop a postnatal tail in the embryonic stage, would be, as follows:
1. Barb fish. During embryonic development of vertebrates, the precursors for such development are known as pharyngeal arches. In the case of fish, these pharyngeal arches are better known as branchial arches, or gill arches and from here the embryonic fish will develop. The one option then to fill in this blank is Barb Fish.
2. Newts: Belonging to the salamander family, this little animal, during the embryonic stage will be able to develop a tail, which will later become a part of the adult newt, or salamander. Newts are amazing because they go through a process known as metamorphoses and it literally means that they change from being a taleless being, to growing a postanal tail.
Look at the DNA segment below. GATCGT Which of the segments below would be complementary to the segment above during DNA replication?
Answer:
CTAGCA
Explanation:
During DNA replication, the DNA double helix is unwound by DNA helices. Each original strand is then used as a template, by the DNA polymerase, to synthesize a new strand. Base pairing rules apply in the synthesis. Cytosine pairs with Guanine while Adenine pairs with Thiamine.
In the 1950s, what discovery revolutionized biotechnology?
A.) cloning sheep
B.) using electrons for microscopes
C.) splicing genes
D.) molecular structure of DNA
In the 1950s, the discovery of molecular structure of DNA revolutionized biotechnology.
Hope this helps chu
Have a great day
Answer:
Answer is option D - molecular structure of DNA.
Explanation:
James Watson and Francis Crick discovered the molecular structure of DNA and mark a milestone in the history of the molecular biology and revolutionized biotechnology. They presented double helix, the twisted-ladder structure of DNA in 1953 and won Noble prize for their discovery in 1962. Though DNA was discovered in 1869. The X-ray crystallography data they presented showed that it is a helix structure composed of two strands coiled together.
Which of these hormones acts in opposition to diuretics such as alcohol? adh glucagon hgh fsh?
Answer:
hgh.
Explanation:
Answer: Glycogen
Explanation:
I had this question before.
Mutations in which of the following genes lead to transformations in the identity of entire bodyparts?
A) segmentation genesB) inducersC) homeotic genesD) egg-polarity genes
The mutations in homeotic genes lead to transformations in the identity of entire body parts. The correct option is C.
What is homeotic gene?Homeotic genes are master regulator genes that control the growth of specific body segments or structures.
Body structures may develop in the wrong place if homeotic genes are overactivated or deactivated by mutations.
These genes responsible for animal structure are known as "homeotic genes," and they contain DNA sequences known as homeoboxes.
Homeobox genes code for protein transcription factors. Hox genes are a specific group of animal genes that contain homeobox sequences.
Homeotic genes control the development of organs in specific segments and parts of the body. Mutations in homeotic genes cause changes in the identity of entire body parts.
Thus, the correct option is C.
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Two populations of birds live in the same area but have different sleep/wake cycles. this is
Two bird populations sharing the same habitat but having different sleep/wake cycles exemplify niche separation or resource partitioning. This allows them to coexist by limiting competition for resources. These differences may be manifested in eating habits, nesting sites or activity cycles.
Explanation:When two populations of birds live in the same area but have different sleep/wake cycles, this scenario is an example of niche separation or resource partitioning. This is a biological concept explaining how similar species can coexist in the same environment by utilizing resources or behaving in different ways, thus reducing competition. These differences may be in their eating habits, nesting sites, and in this case, their sleep/wake cycles.
An example can be taken from the case of the northern spotted owl and the Mexican spotted owl, both the species can coexist because even though they share the same habitat, they rely on different resources and show different patterns.
Different sleep/wake cycles ensure that the birds are active at different times, reducing interference and increasing the efficiency of resource use. Legendary in the concept of 'morning larks' and 'night owls', some species are active during the day and others during the night. This type of activity pattern is known as the bird's chronotypes.
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The antibiotic tetracycline exploits the differences in _______ between prokaryotes and eukaryotes.
hi my name is ship thuck
One king dumb is not named in the graphic. It contains the most ancient bacteria that live in extreme environments. Examples include: halophiles and methane gems. To which kingdom do these belong ?
A. Fungi
B. Archaea
C. Bacteria
D. Archaebacteria
Answer:
B
Explanation:
halophiles are classified into the Archaea domain, there are also bacterial halophiles and some eukaryota
Answer:
Archaebacteria
Explanation:
I just did the USATestprep hope this helps
For some traits (such as birth weight in mammals), natural selection favors individuals that are average and the extremes are selected against. this is known as
Answer:
Directional selection.
Explanation:
This type of directional selection is referred to as stabilizing section where the intermediate phenotypes are favored over those of the extreme. It is referred to as stabilizing selection because it maintains the mean phenotype of the population.
Stabilizing selection is the process where natural selection favors individuals that are average within a population, reducing genetic variance and selecting against extreme phenotypes.
The phenomenon where natural selection favors individuals with the average phenotype while selecting against those with extreme variations is known as stabilizing selection. This form of selection is significant as it leads to a decrease in a population's genetic variance over time. An example of stabilizing selection is human birth weight, where infants who are neither too large nor too small have the highest survival rates. Similarly, in a population of mice living in a woodland, mice with fur color that closely matches the forest floor are favored by natural selection as they are less likely to be spotted by predators compared to mice with fur colors at the extremes.
HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
pharyngeal gill slits: feature that arose in reptiles and helped vertebrates to colonize land
notochord: flexible structure that supports the nerve cord and led to the evolution of the backbone
endoskeleton: internal support system that allowed for large, heavy bodies.
amniotic egg: structure that develops within the mesoderm and allowed for more complex internal organ formation.
Difference in the classification level of plants and animals?
Answer:
Plants are classified different than animals because of the large central vacuole and they are autotrophs and the most important thing is that they have a cell wall and they go through photosynthesis. Animal cells are a little less complex and they are heterotrophs they do not have a cell wall and they dont have the large central vacuole and they dont have the ability to go through photosynthesis. ......Hope this helps :/
Explanation:
which term refers to a solution with more molecules outside the cell than inside the cell? hypertonic hypotonic equitonic isotonic
The answer is hypertonic
Answer: hypertonic
Explanation:
Which of the following statements best defines the term operon?
a. An operon is a region of DNA that consists of a single gene regulated by more than one promoter.b. An operon is a region of DNA that codes for a series of functionally related genes under the control of the same promoter.c. An operon is a region of DNA that codes for sugar-metabolizing enzymes.d. An operon is a region of RNA that consists of the coding regions of more than one gene.
Answer:
b. An operon is a region of DNA that codes for a series of functionally related genes under the control of the same promoter
Explanation:
An operon is usually found in prokaryotic organisms. It refers to the functional structure within prokaryotic genome in which multiple different genes are under the control of one promotor. All of the genes are transcribed together which leads to the formation of polycistronic mRNA. Polycistronic mRNA migh undergo splicing to create monocistronic mRNAs which will be translated separately into few products (proteins).
An operon is a region of DNA that codes for functionally related genes controlled by the same promoter, such as the lac operon in E. coli which is regulated by lactose.
Explanation:The correct definition for an operon is option b: An operon is a region of DNA that codes for a series of functionally related genes under the control of the same promoter. An operon allows for the coordinated regulation of gene expression in prokaryotic cells. For instance, the lac operon in E. coli bacteria, includes a promoter, an operator, and genes that code for enzymes to digest lactose. The presence of lactose can regulate these genes by affecting the binding of the repressor to the operator, allowing for the transcription of these genes when lactose is available.
Which genetic disorders, caused by an extra X chromosome (XXY), is characterized by a lack of testicular development in males, effeminate features, possible mental impairment, and a thin stature? A) Down's syndrome B) Turner syndrome C) sickle cell anemia D) Klinefelter's syndrome
Answer:
D
Explanation:
This is caused mainly by nondisjunction of the sex chromosomes in gametes during meiosis. Therefore a gamete will have both XX chromosomes and fuse with a normal one with Y during fertilization. An XY gamete can also fuse with a normal one with X chromosome. These males with Klinefelter's syndrome produce less than normal levels of testosterone.