The inner and outer surfaces of a cell membrane carry a negative and positive charge, respectively. Because of these charges, a potential difference of about 70 mV exists across the membrane. The thickness of the membrane is 8 nm. A) If the membrane were empty (filled with air), what would be the magnitude of the electric field inside the membrane? (Assume that this field would be constant in magnitude). B) If the dielectric constant of the membrane is K = 3, what would the field be inside the membrane?3) Cells can carry ions across a membrane against the field ("uphill") using a variety of active transport mechanisms. One mechanism does so by using up some of the cell's stored energy (converting ATP to ADP, for those who remember their biochemistry). How much work does it take to carry one sodium ion (charge = +e) across the membrane against the field?
The inner and outer surfaces of a cell membrane carry a negative and a positive charge, respectively. Because of these charges, a potential difference of about 0.070 V exists across the membrane. The thickness of the cell membrane is 8.0 x 10-9 m.
Which type of radiation on the earths surface by the greenhouse effect?
Answer:
Much of this infrared radiation does not reach space, however, because it is absorbed by greenhouse gases in atmosphere, and is then emitted as infrared radiation back toward the Earth's surface. This process is known as the greenhouse effect. Note(hope this help's)
Explanation:
Which level of taxonomy divides its organisms based on DNA sequences
instead of structural similarities? *
A Domain
B Kingdom
C Genus
O D Species
Answer:
D Species
Explanation:
Living organisms have been organized into groups using the Kingdom to Species classification. Kingdom level represents the least specific while Species level represents the most specific. Prior to the discovery of DNA, classification of organisms has been based on structural similarities i.e. organisms that look similar are classified into the same species.
However, the discovery of DNA, put a stop to the erroneous classification of organisms based on structural similarities as there were many exceptions to this. Since members of the same species have a nearly identical DNA, it is used to divide its organisms based on DNA sequences
instead of structural similarities.
Sara poured some sand into a pan. How could Sara best demonstrate wind
erosion using this model?
A. Use a spray bottle to moisten the sand with water.
B. Blow into a drinking straw over the sand.
C. Pour a glass of water into the sand.
D. Let a block of ice melt over the sand.
Answer:
b
Explanation:
reason why is because blowing through a straw demonstrates air so when you blow it against sand or dirt it blows pieces of soil or sand away and in different areas.
Blow into a drinking straw over the sand which demonstrate wind erosion using this model. So, the correct option is (B).
What is Wind erosion?Wind erosion is defined as the natural process that moves soil from one place to another by wind energy which can cause significant economic and environmental damage.
It is a major cause of land degradation in arid and semi-arid grasslands, which is one of the processes leading to desertification. Significant wind erosion occurs when strong winds blow on light textured soils that have been heavily grazed during periods of drought.
It can happen anytime and anywhere when the wind blows which can happen in any area where sand or soil is not compacted or is of fine grained nature. Wind erosion not only destroys the land by drying out the soil and depleting the land's nutrients but also results in air pollution.
Thus, blowing into a drinking straw over the sand which demonstrate wind erosion using this model. So, the correct option is (B).
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Which of the following is the primary advantage of sexual reproduction when compared to asexual reproduction?
A There is greater genetic variety in the offspring
B There is a longer development time for the offspring
C There is more food available to the offspring
D There is a greater number of offspring
Explanation:
(1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1÷1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1 )
What happens to the vegetation around a body that has Just been buried?
Answer:
here's your answer
Explanation:
When buried six feet down, without a coffin, in ordinary soil, an unembalmed adult normally takes eight to twelve years to decompose to a skeleton. However if placed in a coffin the body can take many years longer, depending on type of wood used. For example a solid oak coffin will hughly slow down the process.
pls make it the brainliest
Answer:
The vegatation growth will be suppressed.
Explanation:
This will happen for about a year, then there will be a period of decomposition where the plants grown lush using the body for three years.
I need brainlist for a rank up
A topographic map would best provide information about which area? state boundaries interstate highways routes of minor roads areas with mountains
Answer:
im pretty sure its c if im wrong then its d
Explanation:
i hope this helps :)
Answer:
D. Areas with mountains :)
Which of the following is NOT true about soil sampling?
O It helps prevent over-usage of fertilizers
O It is expensive and not an accurate indicator of soil pH
o It can indicate the amount of available nutrients in soil
It can determine the most current fertility status of a soil
Answer:
It is expensive and not an accurate indicator of soil pH
Explanation:
Soil sample is one of the ways of studying a particular soil in order to know some certain things about it.
A sample of soil is collected for experimental processes to characterize some of its properties and how useful a soil is for an agricultural undertaking. It is not true that soil sampling is expensive and not an accurate indicator of soil pH.Xenotransplantation is using nonhuman animal organs in transplantation. Many people are against this practice. What would be the best argument for why xenotransplantation should be accepted?
A. There are more people on transplantation lists than donor organs so xenotransplantation can save people’s lives
B. People on transplantation lists are not treated equally in that some are moved to the top of the list
C. There are no antigens on the surface of nonhuman animals so there would be no rejection
D. More organs can be extracted from nonhuman to accommodate more recipients
Answer:
A. There are more people on transplantation lists than donor organs so xenotransplantation can save people’s lives
Explanation:
Xenotransplantation, ie using non human animal organs in transplantation, has following most crucial favouring argument
Patients needing transplanted organs are much higher than people willing & able to donate them. So, there is extreme excess demand, needed to be satisfied for saving people's lives.Answer:
The answer is A
Explanation:
Which type of energy turns tidal turbines to create electrical energy?
kinetic
potential
solar
thermal
Answer:
A.
Explanation:
Kinetic energy turns tidal turbines to create electrical energy.
What is kinetic energy?Kinetic energy is a type of motion energy, where potential energy can be defined as energy stored to be utilized.
Kinetic energy is very common to be converted into different types of energy to produce electricity.In this case, kinetic energy is first converted to mechanical energy (i.e., by the motion of turbines).In conclusion, kinetic energy turns tidal turbines to create electrical energy.
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What are the two units of measure
Answer:
hope this helped:)
Explanation:
Systems of Measurement: there are two main systems of measurement in the world: the Metric (or decimal) system and the US standard system. In each system, there are different units for measuring things like volume and mass.
There are many different units of measurement that apply to different quantities and variables. However, if we are talking about the most basic units of measurement of the International System of Units (SI), they are:
1. The unit of measurement of length or distance is meter (m). It is often used to measure the size or dimensions of an object.
2. The unit of measurement of mass is the kilogram (kg). It is used to determine how much material is present in an object.
Other derived units of the SI system, such as the second for time, the liter for volume, and the newton for force, are all derived from these two basic units: the meter and the kilogram.
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How can no color change in the broth and a conversion to a yellow color both be considered negative results?
Answer:
Explanation:
A Pure bacterial culture must be grown in sterile tryptophan or peptone broth for 24–48 hours before performing the test. A sterile environment helps to avoid contamination.
When a test is conducted and it shows the presence of a red or red-violet color in the surface alcohol layer it means the result is positive
But when the colour is yellow it indicate negative reaction due to glucose fermentation.
A deviation from two color may also occur when we have an orange color. This colour change is due to the presence of methyl indole
When there is no color change this indicate No decarboxylase which is an enzyme needed for the fermentation reaction.
Color changes are indicator of how successful the reaction was.
what is a community?How is it different from a population?
Answer:
community is a rural area where more than two specie's living together
Explanation:
while population is the total number of specie's
from the above answers you can see how community and population are different
Our bodies are made up of the same types of organic compounds as all other living organisms. Complete the following sentences by filling in each blank to indicate the function of each type of molecule in different parts of our body. Our muscles contain lots of protein. This protein enables the muscles to _____________.
Answer:
Contract
Explanation:
The main proteins involved in muscle contraction are called actin and myosin.
The image below shows a river at the bottom of a valley with several rock layers exposed.
The rock layers of this river valley were most likely exposed by which of the following?
A. Volcanic eruption
B. Fossil formation
C. Human impact
D. Erosion and deposition
Answer:
D Erosion and deposition
Explanation:
Brainliest please :)
What are 3 words for a moving object that always has energy.
Answer:
Moving object always has a kinetic energy
Explanation:
Answer:
Objects that move have kinetic energy.
Indicate which of the following observations can be made when observing growth on nutrient agar. Group of answer choices Gram reaction of growth Acid-fast morphology Amount of growth Opacity/clarity of colonies Color of colonies Presence or absence of endospores Shape and /or pattern of growth
Answer:
Amount of growth
Opacity/clarity of colonies
Color of colonies
Shape and /or pattern of growth
Explanation:
An agar plate is a Petri dish containing agar as a solid growth medium supplied with nutrients (i.e., an enriched medium), which enable to culture different microbes ranging from fungi to bacteria. Colony morphology is a widely used approach to describe the unique features of bacteria colonies growing on agar media. These colony features include, among others, shape (round, circular, punctiform, irregular), elevations/depressions (convex, concave, flat), textures (dry, moist, crusty, dull, shiny, mucoid, friable, rough), colors (cream, white, purple, gray, red, green, yellow, blue), etc.
The observation that could be made regarding the growth over nutrient agar would be:
C). Amount of growth
D). Opacity/clarity of colonies
E). Color of colonies
G). Shape and/or pattern of growth.
Observation
The growth of nutrient agar can be observed in above-mentioned ways. The area covered during the growth, the level of clarity amongst them, the color developed by them, and their size and formation as well.This assists in making worthy deductions about them.Thus, options C, D, E, and G are the correct answers.Learn more about "Morphology" here:
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Help need now!
(1) Define homeostasis.
(2) What are the two ways a substance can move through a cell’s membrane?
(3) What is passive transport? Will particles move to an area of higher or lower concentration?
(4) How do large molecules move across the cell membrane through facilitated diffusion?
(5) Describe what happens during osmosis.
(6) What are aquaporins?
(7) What is active transport?
(8) Why is energy needed for active transport? Will particles move to an area of higher or lower concentration?
(9) Describe endocytosis.
(10) Describe exocytosis.
Answer: 1Homeostasis is the ability to maintain a relatively stable internal state that persists despite changes in the world outside. All living organisms, from plants to puppies to people, must regulate their internal environment to process energy and ultimately survive. 2Water, carbon dioxide, and oxygen are among the few simple molecules that can cross the cell membrane by diffusion (or a type of diffusion known as osmosis ). Diffusion is one principle method of movement of substances within cells, as well as the method for essential small molecules to cross the cell membrane. 3In passive transport, substances simply move from an area of higher concentration to an area of lower concentration, which does not require the input of energy. Concentration gradient, size of the particles that are diffusing, and temperature of the system affect the rate of diffusion. 4In facilitated diffusion, molecules diffuse across the plasma membrane with assistance from membrane proteins, such as channels and carriers. A concentration gradient exists for these molecules, so they have the potential to diffuse into (or out of) the cell by moving down it.5: Osmosis: In osmosis, water always moves from an area of higher water concentration to one of lower concentration. ... Water has a concentration gradient in this system. Thus, water will diffuse down its concentration gradient, crossing the membrane to the side where it is less concentrated. 6Aquaporins, also called water channels, are channel proteins from a larger family of major intrinsic proteins that form pores in the membrane of biological cells, mainly facilitating transport of water between cells. 7In cellular biology, active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration—against the concentration gradient. Active transport requires cellular energy to achieve this movement.8During active transport, substances move against the concentration gradient, from an area of low concentration to an area of high concentration. This process is “active” because it requires the use of energy (usually in the form of ATP). It is the opposite of passive transport.9Endocytosis definition and purposes. Endocytosis is the process by which cells take in substances from outside of the cell by engulfing them in a vesicle. ... Endocytosis occurs when a portion of the cell membrane folds in on itself, encircling extracellular fluid and various molecules or microorganisms.10Exocytosis describes the process of vesicles fusing with the plasma membrane and releasing their contents to the outside of the cell, as shown in Figure below. Exocytosis occurs when a cell produces substances for export, such as a protein, or when the cell is getting rid of a waste product or a toxin
Explanation:
The shape of DNA is described as a double helix. Click all that apply to the description of DNA.
a.DNA is made from a single strand of nitrogenous bases.
b.A double helix resembles a “twisted ladder”
c.The “backbone” of the ladder is made up of alternating sugar and phosphate groups
d.The “rungs” of the ladder are made up of the bases joined by hydrogen bonds
Answer:
B and c
Explanation:
explain what means homeostatis
Homeostasis is the potential to maintain a quite secure interior country that persists no matter adjustments in the world outside. All residing organisms, from vegetation to doggies to people, ought to adjust their internal surroundings to technique energy and sooner or later survive.
Answer:
Homeostasis is the ability to maintain a relatively stable internal state that persists despite changes in the world outside.
A fracture in the crust when land moves up, down, or sideways is called a split.
True
False
Answer:
False, the correct answer would be Fault(un-needed but oh well)
Explanation:
Can anyone solve this?
What is smaller a red blood cell or a virus?
Answer:
A virus
Explanation:
Answer:
Virus
Explanation:
Virus is smaller
What is transportation in the water cycle
Answer:
Hydrologic Cycle
Explanation:
actually, I'm not sure about this but this one fits the water cycle hehe
PLZ HELP 46 POINTS WHOEVER ANSWERS GETS BRAINEST !!! What happens before mitosis occurs?
A.The cell grows and makes a copy of its genetic material.
B.Cytoplasm from the parent cell becomes two daughter cells.
C.The cell takes a rest.
D.The genetic material of the parent cell multiplies into four sets
Answer:
A. The cell grows and makes a copy of its genetic materialExplanation:
Before Mitosis, is a stage in the cell cycle called the 'Interphase'. During Interphase, the cell grows and makes a copy of its genetic material. During the G1 phase, the cell grows. During S phase, the cell's DNA replicates itself. And during G2, the cell grows and prepares for cell division (mitosis)
Electron micrographs following freeze fracture of the plasma membrane indicate that
Answer:
Electron micrographs following freeze-fracture of the plasma membrane indicate that: the membrane is a phospholipid bilayer.
Exceeding threshold depolarization at the trigger zone______the likelihood of generation of an action potential.
Answer: Exceeding threshold depolarization at the trigger zone decreases the likelihood of generation of an action potential.
Explanation:
Exceeding threshold depolarization at the trigger zone decreases the likelihood of the generation of an action potential.
What is threshold depolarization?Excessive depolarization at the trigger zone reduces the likelihood of an action potential being generated. The amplitude of the action potential decreases with distance. The number of action potentials increases as the frequency of stimulation to the trigger zone increases.
Because the potassium channels within the cell membrane are delayed, any additional sodium entry activates an increasing number of voltage-gated sodium channels. Depolarization above the threshold causes an increase in Na conductance sufficient for inward sodium movement to instantly swamp outward potassium movement.
Therefore, Excessive depolarization at the trigger zone reduces the likelihood of an action potential being generated.
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What is not a type of mutation?
Deletion
Inversion
Migration
Translocation
Answer: The answer is Migration... Hope this helps... Stay safe and have a great day... :D
Explanation:
If today's first high tide is at 7:00 AM, what time will today's next high tide be?
Answer:
7PM
Explanation:
A new high tide rolls in every 12 hours.
.. Studies conducted in England during the Industrial Revolution have shown that children
born to poor families were, on average, shorter than those born to wealthier parents. The
most likely explanation for this difference in height is a difference in
O nutrition.
O family size.
O genetic makeup.
O genetic disorders.
Answer:
genetic make up
Explanation:
this is because the genotype of two parents maybe one was tall the other was for,, environmental factors cannot affect the genotype of an organism,,phenotype can not affect the genotype
Answer:
The answer is 'Genetic Makeup'.
Explanation:
It's pretty simple.