If the threshold of excitation is reached, action potential begins, which causes the inside of the cell to temporarily have a ________ charge.
If the threshold of excitation is reached, action potential begins, which causes the inside of the cell to temporarily have a positive charge.
What is an Action potential?This occurs when the neuron is completely depolarizes back and the cell gets back to the resting potential.
The inside of the cell temporarily has a positive charge which is why it was chosen as the most appropriate choice.
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If the threshold of excitation is reached, action potential begins, which causes the inside of the cell to temporarily have a positive charge.
What is an Action potential?An action potential may be defined as a temporary alteration in the neuron's membrane potential induced by ions unexpectedly flowing in and out of the neuron.
The inside of the membrane becomes positive due to the influx of Na+ ions and efflux of K+ ions during the mechanism of electrical impulse.
Therefore, it is well described above.
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Describe the inner lining of the stomach.
The inner lining of the stomach is made up of a substance called gastric mucosa. Details about inner lining of the stomach can be found below.
What makes up the inner lining of the stomach?The stomach is an organ in animals that stores food in the process of digestion.
The inner surface of the stomach is lined by a mucous membrane known as the gastric mucosa.
The stomach also posseses protective layer that defends the stomach against being digested by its own protein-degrading enzymes.
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Select the correct number on the image.
This map shows the amount of soil moisture (SM), which is an indicator of water availability for people living in that region. Based on the data from map, which region has the maximum risk of a water shortage?
Based on the data from map, region 4 has the maximum risk of a water shortage
What are the effects of water shortage?Three effects that water shortage has on a region is that farming is harder to do because the planets will die without water and then we can't get food. People also don't have drinking water or water.
Another effect is that people can't use water for everyday necessities like keeping clean.
Thus, region 4 has the maximum risk of a water shortage.
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The people represented by the Denisova fossils likely Group of answer choices were isolated to the point of extinction. looked very much like Neandertals. share a common ancestor with Neandertals. interbred with Homo erectus.
The people represented by the Denisova fossils likely share a common ancestor with Neandertals. The correct option is c.
What are Denisova fossils?So far, there is little physical evidence of the Denisovans' existence. A finger bone, teeth, and skull fragment from a Siberian cave, as well as a lower jawbone from a Chinese cave on the Tibetan plateau, have been discovered so far.
The people represented by the Denisova fossils likely share a common ancestor with Neandertals.
Thus, the correct option is c.
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Human beings have a long period of development, requiring nurturance and protection for many years. What would evolutionary theorists argue about this long period of relative immaturity?
There argument would be that It is a necessity because a long period of adaptation is needed for acquiring physical and cognitive competencies.
Who are the evolutionary theorists?Evolutionary theorists are those scientist in the field of psychology that studied the long term discoveries about the development of human beings from generation to generation.
They where able to discover that human beings have a long term period of development requiring nurturance and protection for many years.
This was so because such a long period of time is needed for them to acquire both physical and cognitive competencies.
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What were land bridges used as an explanation for?
A. Tidal forces
B. Mesosaurus fossils
C. Seafloor spreading
D. Magnetic striping on the ocean floor
SUB
a ________ blot is used to identify specific sequences of dna on a membrane, whereas a ________ blot is used to identify specific sequences of rna on a membrane.
A Southern blot is used to identify specific sequences of DNA on a membrane, whereas a Northern blot is used to identify sequences of RNA on a membrane.
What is Southern blot?Southern blot is a technique widely used in molecular biology laboratories to identify DNA in a blood/tissue sample.
Moreover, the Northern blot is a hybridization technique widely used to identify RNA in a blood/tissue sample.
In conclusion, a Southern blot is used to identify specific sequences of DNA on a membrane, whereas a Northern blot is used to identify sequences of RNA on a membrane.
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A ligamentous connection such as an antebrachial interosseous membrane is called a.
Answer:
syndesmosis
Explanation:
fibrous joint in which two adjacent bones are linked by a strong membrane or ligaments. This definition also applies for the distal tibiofibular syndesmosis, which is a syndesmotic joint formed by two bones and four ligaments.
Question 6(Multiple Choice Worth 2 points)
(04.06 MC)
Which statement best describes a decrease in biotic potential?
O Deer increase their rate of reproduction on an island.
Rabbit population increases in a grassland biome.
O Lions have larger broods after successful hunting.
O Seals have more offspring when food is plentiful.
Explanation:
seals more offspring when food is plentiful
Which of the following is the definition for speciation?
an inherited or learned trait that increases an organism's chance of survival in its environment
O the evolutionary process through which new species emerge
O a process by which organisms well suited to their environment tend to pass their traits onto offspring
O a process by which one of the extreme variations of a trait is favored
ANSWER:
I think it is the first one
Explanation:
Speciation is the process in which new species are created through evolution. I might be wrong though.
the evolutionary process through which new species emerge
Groundwater Activity: Properties of Water Lab Report
Introduction
Water is an essential part of processes on Earth. In this lab, you will investigate the properties of water and explain how they affect Earth material and surface processes.
Investigative Phenomenon:
What are the connections between the properties of water and their effects on Earth materials and surface processes?
Materials:
• water
• stopwatch
• a clean penny
• food coloring
• vegetable oil
• clear plastic cups
• dropper or pipette
• ice cube
• black pepper
• a bowl
• dish soap
• sponge or cloth
• a heating source (sunlight, lamp, etc.) or a cooling source (refrigerator)
• one balloon
• measuring tape or string and a ruler
• thermometer
Activity One: Investigating Cohesion
Cohesion is the ability of molecules to bind together. One way to test this is by investigating how the droplets of a particular liquid stick together compared to other liquids. Use the materials you have to determine water’s relative cohesion on a particular surface.
Describe the plan you will follow to determine this:
Record your data and observations:
Phenomena Reflective Question: How does the cohesive property of water come into play with it interacts with Earth materials?
Activity Two: Investigating Surface Tension
Surface tension is a property of a liquid that allows the surface to resist force. This means the surface of a liquid resists the weight of objects.
Procedures:
1. Fill a bowl ¾ full with tap water.
2. Sprinkle about a teaspoon of ground black pepper in the bowl. DO NOT STIR! Observe what happens to the black pepper.
3. Gently place your finger into the water and observe what happens.
4. Put two drops of dish soap on your finger. Gently use your finger to touch the surface of the water and observe what happens.
Data and observations:
Observations
Black pepper in water
Touching water without soap
Touching water with soap
Phenomena Reflective Question: How does the surface tension of water allow for it to interact with Earth materials?
Activity Three: Investigating Solubility
A liquid is polar, which means a substance can easily dissolve in it. How can you test water’s polarity compared to other substances? To measure solubility, it is necessary to compare initial and final results using your visual observations.
Describe the plan you will follow to determine this:
Record your data and observations: Add food coloring to each liquid. Observe each reaction and record your observations in the table below.
Time Water Vegetable Oil
0 seconds
5 seconds
10 seconds
15 seconds
20 seconds
Phenomena Reflective Question: Explain why water is called a universal solvent. How does this polarity allow for water to interact with Earth materials?
Activity Four: Investigating Specific Heat Capacity
Specific heat is the amount of heat energy needed to change the temperature of 1 gram of the substance one degree Celsius. Some objects' specific heat allows them to heat up or cool down faster than others of equal mass. How can you compare water’s specific heat to other substances? How does the specific heat of water affect how other objects, such as a damp cloth, warm up or cool down? To measure specific heat, it is necessary to compare initial and final results.
Describe the plan you will follow to determine this:
Record your data and observations: Observe the temperature of the damp sponge/cloth after being placed under a heat source. Caution: do not set the damp sponge or cloth to close to the heat source. Record your observations.
Time Damp Sponge/Cloth
0 seconds
5 seconds
10 seconds
15 seconds
20 seconds
Phenomena Reflective Question: How does water’s specific heat capacity come into play when it interacts with Earth materials or affect surface processes?
Activity Five: Investigating Expansion and Density
Density of an object can be found by calculating mass divided by volume. If two objects have the same mass, but one has a greater volume, the object with more volume is less dense. Does water’s density change when it is frozen?
Describe the plan you will follow to determine this:
Record your data and observations:
Phenomenon Reflective Question: Did the density of water change when it changed from solid to liquid? How do you think the density of water has an effect on Earth materials and surface processes?
Evaluating the Design:
Part of an investigation is to evaluation how well your investigation gave you the data you needed. In this report, include the following:
1. an evaluation of the plan you made for the various activities and how the data was collected
2. a description of how well the data allowed you to infer the effect of water on materials and processes in the world
3. a description of how to further investigate the effects of water and collect more accurate and precise data
Answer:
Explanation:
Both Groundwater and surface water are largely replenished by rain water.
what happens to the energy captured during glycolysis and the citric acid cycle by the activated carriers nadh and fadh2.
Energy is passed to an electron transport chain in order to produce a proton (H+) gradient across the inner mitochondrial membrane.
What is oxidative phosphorylation?Oxidative phosphorylation is the last and most energetically efficient step in cellular respiration.
Oxidative phosphorylation is based on the transport of electrons on carriers, which is coupled to the generation of a proton gradient.
In conclusion, energy is passed to an electron transport chain in order to produce a proton (H+) gradient across the inner mitochondrial membrane.
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Two students are planning an experiment that will test how planaria (aquatic flatworms) respond to different environments. They will conduct two investigations—one that tests the worms’ responses to different water temperatures and one that tests the worms’ responses to different levels of acidity. Student 1 wants to buy two groups of flatworms and use a different group for each investigation. Student 2 thinks the same group of worms should be used for both investigations.
Do you think either student’s method would give more accurate results? Why or why not? Explain your response.
Student 2 is correct and the same group of worms should be used.
What is an experiment?An experiment is the process by which we establish cause and effect relationships in science. The control variable are those that must be kept the same in the experiment.
We know that the experiment will only be valid if the research is carried out with the same group of worms. If different groups of worms are used, other factors may account for the results obtained.
Thus student 2 is correct and the same group of worms should be used.
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Dihybrid crosses
???
Answer:
The answer is 25% tall/green, 25% tall/white, 25% short/green and 25% short/white
Hope it helps!
Read the scenarios below. For each of the scenarios, identify the following (you should identify the 3 for EACH of the scenarios):
Control Group Independent Variable Dependent Variable
A. John thinks that a special juice will increase the productivity of workers. He creates two groups of 50 workers each and assigns each group the same task (in this case, they're supposed to staple a set of papers). Group A is given the special juice to drink while they work. Group B is not given the special juice. After an hour, John counts how many stacks of papers each group has made. Group A made 1,587 stacks, Group B made 2,113 stacks.
The following were required;
Dependent Variable - productivity of workersIndependent Variable - drinking the special juiceControl group - Group BWhat is a variable?A variable is a measurable quantity that changes in an experiment. The variable that is manipulated in the experiment is called the independent variable.
Now these are the variables that are involved in this experiment:
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Are humans likely affected by biomagnification? if so, which foods might be dangerous?
“Biomagnification or biological magnification is the process of accumulation of certain chemicals in living organisms to a concentration higher than that occurring in the inorganic, non-living environment.”
Human beings occupies the top place of most trophic level and we know that concentration of harmful chemicals increase as we go above the trophic level. Therefore human beings are most adversely affected by biological magnification.
Humans may also be affected due to the consumption of fish and shellfish.
digestive tract & ____________________ together constitute the digestive system.
Answer:
Digestive tract & Accessory glands together constitute the digestive system.
Explanation:
The accessory organs are the teeth, tongue, and glandular organs such as salivary glands, liver, gallbladder, and pancreas.
Inversion, translocation, and nondisjunction are all examples of group of answer choices
a chromosomal mutations
b single gene mutations
c point mutations
d cellular mutations
Inversion, translocation, and nondisjunction are all examples chromosomal mutations. That is option A
What is chromosomal mutations?Chromosomal mutations is defined as the type of mutation that affects the Deoxyribonucleic acid segments.
Example of chromosomal mutations are:
Inversion: This type of mutation occurs when part of chromosomal segment breaks up and reunites to the segment in a reversed way.Translocation: This is a type of chromosomal mutation where by part of chromosome breaks up to reunite with another different chromosome.Nondisjunction: This is a type of chromosomal mutation where by there is failure of segregation in a pair of chromosome during anaphase of cell division.Therefore, Inversion, translocation, and nondisjunction are all examples chromosomal mutations.
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Having curved or straight thumbs is thought to be a Mendelian trait, and the
straight allele is thought by many geneticists to be dominant. Assuming this is
correct, how would you expect the thumbs of someone with two curved-thumb
alleles to look?
Answer:
considering the straight allele is dominant then the curved thumb allele must be recessive. so,if someone has two recessive alleles they will express that characteristic. Therefore, the person's thumbs would be curved
Which represents a negative impact of technology?
A. Accessible technology
B. Production of waste
C. Improvement in climate
D. Access to more resources
Answer:
B
because it is harmful
How does dermal tissue help plants on a hot day?
It releases substances so plants can absorb more water from the soil.
It has a waxy material that prevents the loss of water to the environment.
It has guard cells that open to prevent the loss of water to the environment.
It contains chemical substances that allow plants to use water more quickly.
Fossil fuels are made when....
A. organisms don't fully decompose and become
trapped underground
B. organisms collide at high speeds during
catastrophic events
C. bedrock is liquidated due to shifting tectonic
plates
D. volcanic ash is liquidated under extreme pressure
Answer:
A
Explanation:
a - What happens when organisms don't decompose? If there were no decomposers, wastes and the remains of dead organisms would pile up and the nutrients within the waste and dead organisms would not be released back into the ecosystem. Producers would not have enough nutrients.
b - What happens when a catastrophic mass extinction occurs? A mass extinction event is when species vanish much faster than they are replaced. This is usually defined as about 75% of the world's species being lost in a 'short' amount of geological time - less than 2.8 million years
c - What does the shifting of tectonic plates cause? At the “seams” where tectonic plates come in contact, the crustal rocks may grind violently against each other, causing earthquakes and volcano eruptions. The relatively fast movement of the tectonic plates under California explains the frequent earthquakes that occur there.
d - Volcanic ash doesn't actually do that.
Now, how do fossil fuels form? After millions of years underground, the compounds that make up plankton and plants turn into fossil fuels. Fossil fuels are formed when the organic matter that has been buried deep within the earth is subject to heat and pressure over millions of years. In both cases, heat and pressure are critical to the formation of fossil fuels.
so your answer is a
hope this helps:)
Why do calculations of recombination frequencies between loci that are far apart on chromosomes underestimate the true genetic distance between the loci?.
This is the complete question
A. Recombination frequencies cannot exceed 50% and asymptotically approach 50% as the distance between genes increases because only one crossover can occur per chromosome. B. As the distance between loci increases, some multiple crossovers go undetected such that the relationship between recombination frequency and map distance ceases to be linear. C.Loci that are far apart on a chromosome often recombine to produce combinations of alleles that result in a lethal phenotype and such recombinants are not recovered or identified. D. Loci that are far apart on a chromosome are often susceptible to a form of chromatic interference that results in reduced crossing over, and this interference does not occur for loci that are closer together. E. If two crossovers occur between two loci, then only nonrecombinant gametes are produced; therefore, recombination frequencies actually begin to decrease for more distant pairs of genes.
As the distance between loci increases, some multiple crossovers go undetected such that the relationship between recombination frequency and map distance ceases to be linear. Thus, option "B" is correct.
How, explain your answer briefly?When calculating recombination frequencies, and hence, map distances, we might notice that these distances are not completely additive. They might vary. For example, let us say that we have three genes, A, B, and C, in that order. We calculated that the distance between A and B equals 5.9 MU and that B and C are 19.5 MU apart. According to this, we might say that the total distance between A and C is 25.4 MU (5.9 + 19.5). However, after a two-point calculation between A and C, the value equals 23.7 MU.
The recombination frequency between these two genes located in the extremes and far apart underestimates the actual genetic distances between them because there might occur other crossing-overs that were not detected. This is when calculating the distance between A and C, we probably will not detect the occurrence of a double recombinant between them, and hence, we might sub-estimate the real distance.
The relationship between the actual map distance (number of crossing overs) and the recombination frequency between two loci, is not lineal. The farther apart are the two genes, the worse is the distance estimation.
Thus, option "B" is correct.
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A ligamentous connection such as an antebrachial interosseous membrane is called a.
A ligamentous connection such as an antebrachial interosseous membrane is called a syndesmosis.
A fibrous joint called the syndesmosis is held together by ligaments. It is situated between the distal fibula, or outside leg bone, and the tibia, or shinbone, close to the ankle joint. It is also known as the distal tibiofibular syndesmosis for this reason.
syndesmosis is made up of a number of ligaments. The top three are:
Tibiofibular anterior inferior ligamentTibiofibular posterior inferior ligamentArticular cartilage ligamentTibiofibular transverse ligamentThe syndesmosis ligament supports and stabilizes your ankle by acting as a shock absorber. Its primary function is to keep the tibia and fibula in line and from extending outward too much.
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answer :)
Harry is studying four surface features of Florida. He classifies the surface features and places them in different columns of a chart as shown below.
Surface Features
Column 1 Column 2
Sinkhole Hot springs
Caverns Geysers
Which of these titles best represents Column 2 of Harry's chart?
formed by freezing groundwater
formed by heating groundwater
formed by evaporation of groundwater
formed by chemical action of groundwater
The title that best represents Column 2 of Harry's chart is B. formed by heating groundwater
What is a Hot Spring?This refers to the geothermally heated groundwater that is formed on the surface of the earth.
Hence, we can see that from Column 2 of Harry's chart, there is the presence of Hot springs and Geysers which are both formed by heating groundwater and option B is correct.
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Answer:b
Explanation:took a test
What will most likely happen if a person does not consume the minimum daily requirement of carbohydrates?
If a person does not consume the minimum daily requirement of carbohydrates then the body will use stored glycogen and the person will look unhealthy and become weak after some time.
Importance of carbohydrates: Like other nutrients, carbohydrates are also very essential for various functions of the body. Carbohydrates such as glucose are required for instant energy and day-to-day activities. If there is no or less amount of carbohydrate in the body then our body will start converting the glycogen that is stored in the liver into glucose. After some time, the person will start to appear unhealthy, thin and weak if there is no minimum daily requirement of carbohydrates is met.To know more about carbohydrates, refer:
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Define fulcrum?
please help me
Answer:
Fulcrum is the type of machine which helps us to lift the material from any places
Answer:
The fixed point on which a lever turns in moving a body.
how many daughter cells are formed after meiotic division
Answer:
four daughter cells
Explanation:
The process results in four daughter cells that are haploid, which means they contain half the number of chromosomes of the diploid parent cell. Meiosis has both similarities to and differences from mitosis, which is a cell division process in which a parent cell produces two identical daughter cells.
Carbon dioxide released during ATP synthesis is being transported from our tissues back to the lungs, some of it is dissolved in plasma, the rest is converted and transported as other substances. Most of the carbon dioxide is converted into ______.
Answer:
HCO3
Explanation:
The common health-associated infection seen in an outpatient setting, called mrsa, is caused by which type of bacteria?.
Methicillin-resistant-staphylococcus-aureus (MRSA) infection is caused by the bacteria called staphylococcus aureus, which leads to skin infections in mild form and respiratory diseases in severe form.
Hospital-Acquired MRSA – is associated with infections that are caused due to exposure to hospital or nursing home environments.The infection can be caught through direct contact or contaminated hands. Sometimes touching used surgical instruments or infected bedsheets can also pass on the infection leading to severe pneumonia or blood infections. Hence, people hospitalized for longer durations, live in nursing homes, or visit hospitals regularly without protection are prone to get a staph infection.Hospital acquired MRSA often causes severe symptoms compared to community-acquired MRSA due to prolonged exposure to bacteria.learn more about MRSA here: https://brainly.com/question/8190489
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