Cell membrane is semi-permeable outer covering of an animal cell. Cell membrane allows the transport of substance into and out of the cell. When the spinach and lettuce are placed in water they become firm and crisp due to endo-osmosis of water.
What is a Cell Membrane?A cell membrane is the outermost covering in the animal cell and it is covered by the cell wall in the plant cells. Cell membrane is responsible for the transport of materials into and out of the cell.
Cell membrane is semi-permeable in nature that means it only allows some substances to pass through the membrane and block others. Osmosis and diffusion are the processes through which substance pass. When a cell is placed in water, the concentration of water is low inside the cell as compared to the solution. In this case, water travels from its high concentration to its low concentration into the plant cell and the leaves swell and become crisp.
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Question 4 of 10
Which phase of the cell cycle begins after G₁ phase is complete?
A. Cytokinesis
OB. G2 phase
OC. M phase
OD. S phase
The S Phase takes place after when G1 phase is completed.
The cell cycle generally composed of four phase that are G1, S, G2 and M (Mitotic phase) G1, S, G2 phases are the part of interphase.
A cell divides Into two daughter cells as a result of a sequence of events known as the cell cycle, or cell-division cycle. These occurrences include the duplication of its DNA and a few of its organelles, followed by the cell division process, which involves dividing the cytoplasm and other parts of the parent cell into two daughter cells.
DNA synthesis or replication takes place during the S phase of a cell cycle, which happens during interphase and comes before mitosis or meiosis. By doing this, a cell’s genetic material doubles before it begins mitosis or meiosis, providing enough DNA for the cell to divide into daughter cells. Only once the cell has grown sufficiently to contain twice as much DNA and has crossed the G1 checkpoint does the S phase start. Until this occurs, p16, a protein, stops S phase.
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2. This membrane protein changes its shape when certain molecules are bound to it.
what was the independent and dependent variable of kettlewell’s experiment
Answer:
The experiment found that birds selectively prey on peppered moths depending on their body colour in relation to their environmental background.
Explanation:
The evolution of a dark-coloured body provided a survival advantage in a polluted locality.
Independent Variable: Moth color (light or dark)
Dependent Variable: Predation rate by birds on moths (affected by camouflage against tree trunks).
The independent variable in Kettlewell's experiment was moth color—light or dark. The dependent variable was bird moth predation. Kettlewell examined pollution-induced tree trunk darkening, industrial melanism. Soot-covered trees helped dark moths conceal, minimising predation. The experiment examined if moth colour affected avian predation.
Light moths were more apparent on dark trees and preyed on, whereas dark moths had an advantage. This encounter showed how natural selection adapts organisms to environmental changes. Kettlewell's work showed how camouflage affected predation and evolution, linking colour variation to survival benefits in diverse settings.
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Place these major moments from civil rights history in order from earliest to most recent.
Start by clicking the first item in the sequence or dragging it here
Drag the items below into the box above in the correct order, starting with the first item in the sequence.
Plessy v. Ferguson is decided by the Supreme Court.
The Fourteenth Amendment is ratified.
The Voting Rights Act is passed.
Dred Scott v. Sanford is decided.
Brown v. Board of Education is decided by the Supreme Court.
The major moments from civil rights history in order from earliest to most recent are as follows,
I. Scott vs Stanford is decided.
ii. The Fourteenth Amendment is ratified.
iii. Plessy vs Ferguson is decided by the Supreme Court.
iv. Brown vs Board of Education is decided by the Supreme Court.
v. The Voting Rights Act is passed.
In 1857, Scott vs Stanford is decided. In this ruling, the U.S. Supreme Court stated that enslaved people were not citizens of the United States and therefore, could not expect any protection from the federal government or the courts.
In 1868 the 14th Amendment to the U.S. Constitution is passed, guaranteeing due process and equal protection rights to all citizens.
In 1896, the U.S. Supreme Court "separate but equal" decision in Plessy v. Ferguson approved laws requiring racial segregation, as long as those laws did not allow for separate accommodations and facilities for blacks that were inferior to those for whites.
In 1954, the U.S. Supreme Court decision in Brown v. Board of Education of Topeka, Kansas ended legal racial segregation in public schools.
In 1965, the Voting Rights Act prohibits the denial or restriction of the right to vote, and forbids discriminatory voting practices nationwide.
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Scientists once believed that protons, electrons, and neutrons were the smallest particles of matter. Now they believe that these particles are made of even smaller particles.
Which statement gives one of the reasons the original belief was a theory?
A It was not based on tests or observations.
B It was a factual statement based on a hypothesis.
C It did not explain what matter is actually made of.
D It was a widely accepted explanation of the structure of matter.
Answer:
b
Explanation:
because science is all about hypothesis
5. R groups can be classified by their chemical properties. Identify the three classifications for R groups and then
discuss how the R groups affect the structure and function of a protien
Answer:
this is answers
scan and see
The ________________________ absorbs water and salts from the undigested waste.
Answer:
The large intestine absorbs water and salts from the undigested waste.
1 The......
of flowers make a yellow powder called
2
Pollination happens when pollen moves from the......
to the.....
of a flower of the same type.
3
Some plants use......
to blow the pollen far way.
4
Insects get .........
on their bodies when they visit flowers to feed
on
5
The.......
and eggs join together inside the
during
.This is how......
form.
stamen, pollen, stigma, ovary, wind, pollen
not sure ab #5
how we can distinguish the location of each researcher on research( their university)
Such a central database doesn't exist, certainly not one that includes all researchers working in a particular field.
Even though it's a rather ambiguous mapping, one of the best options I can think of is to query for all publications in as many influential venues of the field you're interested in using DBLP (or a queryable part of it, like Faceted DBLP), and then filter the linked authors based on their foaf: homepage attribute.
This may at least give you a rough idea of the institution (and therefore the nation) the researcher is (or was?) involved with. (Very unstable; however, it might be close to being better than nothing.) –
I believe using the websites of the principal pertinent institutions is your best course of action. However, it will take a lot of work.
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Explain how the guard cell controls water loss from a leaf?
Where do counseling psychologists usually work
Answer:
Hospitals.
Rehabilitation centers.
Mental health facilities.
Long-term care facilities.
Schools.
Universities.
Public counseling centers.
Correctional facilities.
Explanation:
im at a correctional facilitie right now we got counselers here
Answer: Counseling Psychologists usually work at the places I have listed.
Hospitals
Rehabilitation centers
Mental health facilities
Long-term care facilities
Schools
Universities
Public counseling centers
Correctional facilities
Independent or private practices
Which is the best explanation of the change in energy shown in the model
A New energy is produced by plants during photosynthesis
B charge amount of energy are we listen to the environment during photosynthesis
C Energy from sunlight is destroyed as its powers photosynthesis
D Energy input from the environment is Stored in food molecules during photosynthesis
The correct option is D : Energy input from the environment is Stored in food molecules during photosynthesis.
What is Energy?
Energy is defined as the ability or capacity to do work.
Energy is measures in a unit called joules.
A change in energy can be explained as "energy input from the environment is Stored in food molecules during photosynthesis".
During the process of photosynthesis, light energy from the Sun is used by the plant to produces food molecules from carbon dioxide and water. Hence, light energy is changed to chemical energy in photosynthesis.
In conclusion, photosynthesis converts energy input from the environment into food molecules.
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The main two ways scientists share results of an experiment are
by writing a paper and submitting it to an academic journal or
presenting their findings to their students at universities.
O True
O False
Answer:
False
Explanation:
I took the test
A sledgehammer has a mass of 3.5 kilograms. What net force, to the nearest whole newton, will a person need to apply to accelerate the sledgehammer at a rate of 4.0(m)/(s^(2)) ?
Record your answer in the boxes below. Be sure to use the correct place value.
Force is equal to mass multiplies with the acceleration.
So, the correct answer is 14 N.
What is Force?Force is the push or pull of an object which cause changes in velocity or to accelerate with mass. It is a vector quantity which means it has direction as well as magnitude.
A force is usually denoted by the symbol F. Below equation is derived from the second Law of Newton.
F = m·a
where F = force, m = mass, and a = acceleration.
For above example,
Mass= 3.5 kg
Acceleration (a)= 4[tex]m/s^{2}[/tex]
so, F=3.5*4= 14N
The SI unit of force is the Newton (N). Other units of force include dyne, kilogram-force (kilopond), poundal and pound-force.
Thus, Force is equal to mass multiplies with the acceleration.
So, the correct answer is 14 N.
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Why would it be considered a drawback for animal cells to contain cellulose?
when scientists group observations that are alike in some way they are
How are lipids and carbohydrates alike
Answer:
Both lipids and carbohydrates contain a lot of chemical energy and can be used for energy storage.
Explanation:
Like carbohydrates, lipids are composed of carbon, hydrogen, and oxygen. In addition to storing energy, lipids help build certain hormones; provide insulation; and form cell membranes.
Which statement is true about the function of ATP?
Responses
It's used to store energy for long periods of time.
It's used to store energy for long periods of time.
It can only be used to help transport molecules.
It can only be used to help transport molecules.
It's primarily used to fuel cell division.
It's primarily used to fuel cell division.
It provides energy for all cellular activities.
Answer:
its provides energy for all cellular activities
In a data set, thAre claims about the effects of meditation most likely scientific or pseudoscientific?
scientific, because people have been claiming for thousands of years that meditation helps them
scientific, because observations of brain growth and chemicals are made carefully and repeatedly
pseudoscientific, because practices that are related to religion are based on beliefs and are subjective
pseudoscientific, because people have made claims about it but scientific observations have not been madee number that appears the most is called the
.
In a data set, the claims about the effects of meditation are most likely scientific because observations of brain growth and chemicals are made carefully and repeatedly.
Option B is correct.
What is pseudoscience?Pseudoscience can be referred to a term consisting of statements, beliefs, or practices that claim to be both scientific and factual but are incompatible with the scientific method.
In a data set, the claims about the effects of meditation are most likely scientific because observations of brain growth and chemicals are made carefully and repeatedly.
scientists have made claims about the effects of meditation and what it does to the brain with the results being shown in the recording of the brain activities. Therefore, we would say meditation is a scientific process.
pseudoscience on the other hand have made claims about meditations but scientific observations have not been made to back up the claims.
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What should a food worker do too prevent chemical hazards from contaminating food
A. Wear gloves when working with ready-to-eat foods
B. Remove pits from cherries and immediately discard them
C. Store cleaning solutions in a utility closet away from food
D. Clean and sanitize cutting boards after cutting raw chicken
Answer:
i think (C.) Store cleaning solutions in a utility closet away from food
is the most important one
why can’t Science tell us what happened at the beginning of time.
Answer: Because god is what happened at the beginning of time but science can explain god no one can so they can't talk about how the beginning of the world happened
Explanation:
i guess because we can't prove everything 100% and lots of people have different beliefs
hope this helps but i doubt it lol
What can be determined about the relative ages of the fossils
Answer:
ttttttttt
Explanation:
Nitrogen fixation by bacteria is one of the
ways that atmospheric nitrogen is converted
to a form that plants can use to make
biomolecules.
In the nitrogen cycle, which
process restores nitrogen gas back to the
atmosphere?
Answer: Denitrification
Explanation: Caused by bacteria when they use nitrate instead of oxygen for respiration
Living organisms require energy for
All living things require energy to carry out their activities. Metabolism is a series of chemical events that provide energy for cellular operations. Every movement or action performed by an organism consumes energy.
Why do organisms need energy?
Role of energy:
By reading a book, walking or running. Your body needs energy all the time. There are activities in our bodies that we are not even aware of that require energy.
For example, our heart keeps beating and breathing. We digest food, absorb it into our bloodstream and carry out various activities in our body. Therefore, all these processes, like many others that occur in the body, require the use of energy.
How do organisms use energy?
Almost everything consumes sunlight or anything that consumes sunlight. The sun is the primary source of energy for species and the environments in which they live. For example, plants and algae use the energy of sunlight to create food energy by mixing carbon dioxide with water. Additionally, this process initiates the transfer of energy through virtually all food webs.
people as well. By breaking down food molecules, cells can store energy. It performs many functions that cells, and thus whole organisms, perform.
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What is the Punnett square for RrYy x rrYy
RrYy x rrYy
Gametes: RY, Ry, rY, ry and rY, ry, rY, ry
Upon crossing these gametes:
RrYY, RrYy, RrYY, RrYyRrYy, Rryy, RrYy, RryyrrYY, rrYy, rrYY, rrYyrrYy, rryy, rrYy, rryyA dihybrid cross is made up of two people who have two features that are regulated by two different genes. Gregor Mendel's observation of pea plants that were either round or wrinkled, yellow or green, gave rise to the concept of a dihybrid cross.When two heterozygous people are crossed, the offspring's genotype and phenotypic ratios will be predictable. Crossing heterozygous parents would result in an estimated phenotypic ratio of 9:3:3:1.Deviations from these predicted ratios may point to a relationship between the two features or to a non-Mendelian method of inheritance for one or both of the traits.The genotypes of a specific cross or breeding experiment are predicted using the Punnett square, a square diagram.16 different genotypes will be formed.
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Which statement is NOT true about the maintenance of variation in a
population?
O Heterozygote superiority may lead to selection for the heterozygote above
either homozygote.
O Selection for adaptation to a particular environment ensures that the
population will become stronger and more viable under any conditions.
O Only phenotypes are acted on by selection, so heterozygotes serve as a
reservoir of recessive alleles that may be adaptive in a different environment.
O Variations allow for the presence of conditions such as sickle cell anemia.
O Variation is maintained through mutation, recombination, gene flow, and
changed conditions.
Selection for adaptation to a particular environment ensures that the
population will become stronger and more viable under any conditions. This statement is NOT true about the maintenance of variation in a
population.
A variety of factors contribute to population genetic diversity. Potentially harmful recessive alleles in diploid organism populations can be protected from selection by heterozygous individuals (recessive alleles are only expressed in the less common homozygous individuals). Natural selection can also preserve genetic diversity by preserving balanced polymorphisms. Balanced polymorphisms may develop when heterozygotes are preferred or when selection is frequency-dependent.
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What happens to the balloons as the nubber sheet is released ?Suggest an explanation for your observation.
When the rubber sheet is pushed upwards into a dome shape, the balloons become deflated. This is because the air volume inside the bell jar decreases, thus increasing the air pressure. As a result, the volume of the balloons decreases and the pressure increases.
I hope this helps :)
Which of the following government agencies' websites would be referenced to determine the infant mortality rate in the United States from
1998-2004?
Prevention and Control for Disease (CDC). The national public health organisation of the United States is called the Centers for Disease Control and Prevention. It is a federal agency of the United States with its main office in Atlanta, Georgia, and is part of the Department of Health and Human Services.
The major objective of the organisation is to protect public health and safety by preventing and controlling sickness, accidents, and disabilities both domestically and abroad. The Centers for Disease Control and Prevention - CDC focuses on creating and implementing disease control and preventive strategies. Centers for Disease Control and Prevention pays close attention to environmental health, occupational safety and health, infectious illness, food-borne pathogens, occupational health, health promotion, injury prevention, and educational initiatives aimed at enhancing the health of Americans in general. As a founding member of the International Association of National Public Health Institutes, the Centers for Disease Control and Prevention - CDC also conducts research and disseminates knowledge on non-infectious disorders like diabetes and obesity.
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URGENT which list orders the terms from least complex to(at the beginning) to most complex(at the end)
A. cell, atom, molecule, organelle
B. atom, molecule, organelle, cell
C. cell, organelle, molecule, atom
D. Atom, molecule, cell, organelle
Explanation:
the answer should be D because an atom is smallest
enzimes have an attachment site called the______site for the_______to join