why is water considered to be polar molecule
Answer:
Explanation: A water molecule, because of its shape, is a polar molecule. That is, it has one side that is positively charged and one side that is negatively charged. The molecule is made up of two hydrogen atoms and one oxygen atom. The bonds between the atoms are called covalent bonds, because the atoms share electrons. The hydrogen atoms have one electron each.
Because they share those electrons with the oxygen atom, the electrons tend to stay close to the oxygen atom and the outside of the hydrogen atom tends to be positively charged. The oxygen atom has eight electrons. Most of those tend to stay away from the hydrogen atoms, and cause the outside of the oxygen atom to have a negative charge.
Answer: It has one side that is positively charged and one side that's negatively charged.
Suppose you have two genetic variants of a large protein that differ only in that one contains a histidine (side chain pKa = 6.0) when the other has a valine (uncharged side chain).1. Which would be better for separation: gel electrophoresis or isoelectric focusing?A. Gel electrophoresis.B. Isoelectric focusing.2. What would you choose for the separation?A. At a pH of 6.0.B. At a pH above 6.0.C. At a pH below 6.0.D. At any pH value.
Answer:
1. The correct option is B: Isoelectric focusing
2. The correct option is A: At a pH of 6.0
Explanation:
1. Gel electrophoresis is a technique used to separate proteins on the basis of size. Since these two proteins are of similar size (or molecular weight), it will prove to be ineffective to achieve the desired result.
2. Since valine has an uncharged side chain, it will not be affected by pH value so it needs to be maintained at the value where it does not exert direct influence on the protein with histidine.
What is the difference between a natural resource and an ecosystem service?
Answer:
this is your answer hope this will help you
The main difference between a natural resource and an ecosystem service is that natural resources are tangible and can be directly used by humans, while ecosystem services are intangible and are the benefits that humans get from ecosystems.
How do we explain?Natural resources are often used to provide ecosystem services. For example, water is a natural resource that is used to provide the ecosystem service of regulating temperature.
Ecosystem services are essential for human well-being. They provide us with food, water, shelter, and other essential resources. They also help to regulate our climate, clean our air and water, and provide us with a place to recreate.
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Draw the noncyclic amp molecule after it has dissolved in water
Answer:
When a cyclic AMP is dissolved in water it loses its bond between its P atom and its main aromatic ring. In the pictures attached, is shown in red the bond that's lost. The cyclic AMP is a messenger involved in many biological processes.
Eratosthenes determined the circumference of Earth by conducting an
experiment. Put his steps in order as they correlate to the scientific method
The provided question is incomplete, However, the missing part of the question is as follows:
1. State the Problem:
2. Make a Hypothesis:
3. Make Observations:
A) If the sun casts shadows at different angles at the same time of day in different places, we can determine how much Earth curves.
B) In Syene, the sun's rays are vertical at noon. At the same time in Alexandria, the rays are 7.2 degrees from the vertical.
C) How can we prove Earth is round and calculate its circumference?
Answer:
The correct order would be : C, A, and B.
Explanation:
Scientific method for a experiment involves various steps in order such as finding a problem, make a hypothesis, creating observations, conducting experiment, collecting data, analyzing the data, making conclusion and repeating the process.
Option c is a problem about the circumference if earth about how can prove the round and calculate circumference. Option A is hypothesis related to this problem and option C. is observation.
Thus, the correct answer is C, A, B.
in comparison to eukaryotic cells most prokaryotic cells are very
Answer:
?
Explanation:
Could you add more explanation I think I could help but I don't know exactly what you're asking?
A researcher removes all of the mitochondria from a cell. This would likely result in the cells inability to use which of the following molecules
A. The amino acid glycine
B. The nitrogenous base uracil
C. Oxygen
D. Carbon dioxide
I think it’s oxygen but I’m not sure.
Answer:
C. Oxygen
Explanation:
Mitochondria are membrane-bound organelles found in the eukaryotic cells. They are regarded as the "power house" of a cell because of the vital role they play in the synthesis of energy needed to drive an organism's cellular activities. Their role in production of energy (in form of ATP) comes from the cellular respiration that occurs in them.
The kreb's cycle and oxidative phosphorylation of aerobic cellular respiration occurs in the mitochondria. As the name "aerobic" implies, oxygen is strictly involved in the process of respiration occuring in the mitochondria. Hence, if researcher removes all of the mitochondria from a cell, the cell will be unable to use OXYGEN, which is necessary for the cellular respiration in the mitochondria.
Answer:
C. Oxygen
Explanation:
Just took the quiz
A student prepares a cell homogenate from spinach leaves. She performs a cell fractionation experiment to determine the centrifugal force (g-force) that will yield the highest percentage of chloroplasts in the pellet fraction. She splits the spinach homogenate into 5 equal parts and centrifuges the parts for 10 min. at 500xg, 1000xg, 1500xg, 2000xg, or 2500xg. She then determines the proportion of chloroplasts in the supernatant and pellet fractions. The dependent variable in the student's experiment is:
Answer:
the proportion/percentage of chloroplasts in the supernatant and pellet fractions
Explanation:
The dependent variable of an experiment is the variable that is measured by an experimenter or the variable that responds to changes made to another variable (independent variable). The dependent variable is dependent on the independent variable.
In this experiment, a student performs a cell fractionation experiment in order to determine the centrifugal force (g-force) that will yield the highest percentage of chloroplasts in the pellet fraction. The centrifugal force is the independent/manipulable variable while the DEPENDENT VARIABLE IS THE PROPORTION/PERCENTAGE of CHLOROPLASTS in the SUPERNATANT and PELLET FRACTIONS.
The correct answer
??
Answer:
the one you have selected looks right
How does adhesion help explain how a sponge or paper towel cleans up spilled water?
Answer:
Adhesion is a property of water that allows it to stick to things. This is why you can clean up spilled water with a sponge or paper towel. The negative and positive charge in water's molecules are attracted to other things with a negative and positive charge.
hope this helps ߷
Among different properties of water, adhesions is a property which allow water to stick to things. Hence, during clean up by paper towel or any sponge can absorb that water molecule.
What are the properties of Water?Water is a chemical molecule having formula H2O where two hydrogen atoms covalently bonded to a single oxygen atom to form one molecule of water.
It is a colorless, odorless, tasteless fluid present in the condensed form due to extensive hydrogen bonds.
It has high melting, boiling points, higher specific heat, thermal conductivity, surface tension, dipole moment, etc.
It maintain the body temperature as it has a high latent heat of vaporization.
Water show acidic and basic behavior, involve in redox reaction and hydrolysis reaction.
As paper towel made up of cellulose sugar molecule, it help in absorption of water.
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What combination of sex chromosomes is shown in the image?
o
Please help a boi out ;-;
PLEASE HELP ASAP!!! CORRECT ANSWERS ONLY PLEASE!!! I'M REALLY BEHIND ON MY ASSIGNMENTS, AND NEED THE CORRECT ANSWER.
Answer:
third pic on right is cleavage and other two r fracture
You are studying to become a doctor and must explain to a patient about mutations. She would like to
know how they happen. Which of the following can you tell her does NOT cause them?
.
.
O A. Exposure to UV radiation
O B. Standing in front of a microwave while it's on
O C. Exposure to certain chemicals
.
O D. Errors during DNA replication
Answer:
A.Exposure to UV radiation
Explanation:
The one that does not cause mutation in the patient is exposure to UV radiation. The correct option is A.
What is mutation?A mutation is an alteration in an individual's DNA sequence. Mutations can be the outcome of errors in DNA replication all through cell division, mutagen exposure, or viral infection.
Mutagens are environmental factors that cause mutations. Mutagens can be radiation, chemical products, or infectious agents. Mutations can occur spontaneously in nature.
UV rays can lead to premature skin aging and sun damage symptoms such as wrinkles, leathery skin, liver spots, actinic keratosis, and solar elastosis.
Thus, the correct option is A.
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A student observes that a plant has droopy leaves and stems and infers
that the rate of photosynthesis has slowed in the plant. Which statement !
provides evidence to support the student's inference? *
The water pressure in the plant's vacuole is low, and without water, the chloroplasts
cannot convert carbon dioxide to glucose during photosynthesis.
O
The water pressure in the plant's ribosomes is low, and without water, the chloroplasts
cannot convert carbon dioxide to glucose during photosynthesis.
O
The water pressure in the plant's vacuole is low, and without water, the mitochondria
cannot convert carbon dioxide to glucose during photosynthesis.
The water pressure in the plant's ribosomes is low, and without water, the
mitochondria cannot convert carbon dioxide to glucose during photosynthesis.
With which cellular process are ribosomes directly involved?
1 point
Answer:the third one I guess
Explanation:
The rate of photosynthesis can slow down due to low water pressure in vacuoles and without water, the mitochondria cannot convert carbon dioxide to glucose during photosynthesis. So the correct option is C. The ribosomes are directly involved with the translation of mRNA to form proteins.
What is photosynthesis?Green plants and certain other creatures convert light into chemical energy through a process called photosynthesis. Light energy is gathered and utilized during photosynthesis in green plants to change the water, carbon dioxide, plus minerals into oxygen- and energy-rich organic molecules.
It is hard to overstate the role that photosynthesis plays in sustaining life on Earth. There would eventually be little food or other organic materials on Earth if photosynthesis stopped. The majority of life would vanish, and eventually, the atmosphere of Earth would contain almost no gaseous oxygen. Only chemosynthetic bacteria, which can use the chemical energy of certain inorganic substances and are not reliant on the conversion of light energy, would be able to survive in such an environment.
The fossil fuels (coal, oil, and gas) that drive modern society today were created by plants using energy from photosynthesis carried out millions of years ago. Green plants and tiny critters that fed on plants grew more rapidly in the past than they were eaten, and as a result, sedimentation as well as other geological processes buried their remnants in the Earth's crust.
Therefore, the correct option is C.
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importance of snail
Answer:
Snails are good sources of
Iron ProteinVitamin B12Omega -3MagnesiumSeleniumExplanation:
What is the correct order of steps in the scientific method
Answer:
1-7
Explanation:
Step 7- Communicate. Present/share your results. Replicate.
Step 1- Question.
Step 2-Research.
Step 3-Hypothesis.
Step 4-Experiment.
Step 5-Observations.
Step 6-Results/Conclusion.
The correct order of steps in the scientific method is to ask questions, make a hypothesis, test the hypothesis, analyze results, draw conclusions, and communicate results. The correct option is a.
What are scientific methods?Through testing and experimentation, the scientific method establishes facts in an unbiased manner. Making an observation, formulating a hypothesis, making a prediction, carrying out an experiment, and then evaluating the findings are the fundamental steps.
The idea put up is that if scientific methods are applied, the bean plant may grow anyplace. Putting the theory into practice and gathering data The same dirt is used to plant four bean plants in similar pots.
Therefore, the correct option is a. Make a hypothesis, test it, then explain the outcomes after analyzing the data and drawing conclusions.
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The question is incomplete. Your most probably complete question is given below:
Ask questions, make a hypothesis, test the hypothesis, analyze results, draw conclusions, and communicate results.
Make a hypothesis, test the hypothesis, analyze the results, ask a question, draw conclusions, and communicate results.
Ask a question, make a hypothesis, test the hypothesis, draw conclusions, analyze results, and communicate results.
Ask a question, analyze results, make a hypothesis, test the hypothesis, draw conclusions, and communicate results.
Describe carrying capacity
The thoracic cavity contains the ________. It is found ________ to the vertebral cavity.
Answer: The thoracic cavity contains the heart, lungs and many of the main vessels of the circulatory system. It is found anterior to the vertebral cavity.
Explanation:
The thoracic cavity is the second largest hollow space of the body and it is the space limited by the ribs, the vertebral column, and the sternum. It is the upper region of the body starting from the neck and ending where the diaphragm ends. So, it is separated from the abdominal cavity by the diaphragm. It contains 12 ribs, and 7 of them attach directly to the sternum, 3 attach to the sternum via cartilages and 2 do not attach to the sternum at all and are called floating ribs. The cavity contains several organs, such as the lungs, heart, great vessels and esophagus.
The abdominal cavity spaces around the organs are filled with the core muscles that attach to the posterior spine. Besides. the ribs vertically, horizontally and across the abdominal region.
The vertebral cavity is the posterior portion of the dorsal cavity, it contains the spinal cord within the vertebral column, the meninges and the fluid-filled spaces between them. It is formed by the vertebrae through which the spinal cord passes.
The thoracic cavity is anterior to the vertebral cavity, because anterior describes the front or direction toward the front of the body.
If lactose is a disaccharide, what macromolecule
must it be an example of?
carbohydrate
nucleic acid
lipid
proteine
Answer: carbohydrates
Explanation:
Lactose is a disaccharide and it is an example of a carbohydrate. So the correct option is A.
What is a disaccharide?
A disaccharide can also simply be called a double sugar. It is that type of sugar that is formed when two monosaccharide molecules or simple sugars are combined by the formation of a glycosidic linkage. Disaccharides are soluble in water, like monosaccharides. Sucrose, lactose, and maltose are commonly known disaccharides.
The carbohydrates, which on acid or enzyme hydrolysis, release two molecules of monosaccharides which are either of the same type or different are called disaccharides.
The loss of the water molecule results in the formation of an oxide linkage and after that, the two monosaccharides are formed by that linkage. The joining of two monosaccharide units via an oxygen atom results in the formation of a glycosidic linkage.
Sucrose is the most common disaccharide which gives D -(+)- glucose and D-(-)- fructose on hydrolysis.
Therefore the correct option is A.
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1. Cell membrane / a. Contain chlorophyll I 2. Cell wall r b. Jellylike liquid inside cells 3. Cellulose c. Carry "blueprints" for new cells 4. Chloroplasts d. Directs most cell activities 5. Chlorophyll e. Stores food and water for the cell 6. Chromosomes f. Holds animal cells together 7. Cytoplasm g. Stiff material in cell walls h. Chemical that helps plants 8. Nucleus ,.., make food 9·~ Vacuole i. Stiff structure around plant cells
Answer:
Cell Membrane / F.
Cell Wall / I.
Cellulose / G.
Chloroplasts / A.
Chlorophyll / H.
Chromosomes / C.
Cytoplasm / B.
Nucleus / D.
Vacuole / E.
Explanation:
Took Biology before. Hope it helps. The way it was copy and pasted made it hard to read.
Following a scientific method, which of the following is the correct order of steps?
A. Observation → Analysis → Hypothesis → Conclusion → Communicate results → Experiment
B. Observation → Hypothesis → Experiment → Analysis → Conclusion → Communicate results
C. Experiment → Hypothesis → Observation → Analysis → Conclusion → Communicate results
D. Observation → Hypothesis → Experiment → Communicate results → Analysis → Conclusion
Answer:
B. Observation → Hypothesis → Experiment → Analysis → Conclusion → Communicate results
Explanation:
In a scientific method the order of sequence of activities include observing a phenomenon and making an hypothesis which contains why the scientists thinks such phenomenon occurs.
The Scientists then performs series of experiments to try to verify and prove his hypothesis. The results of the experiments are then analyzed and a conclusion is drawn. The results are then communicated to other people to lay claim of the work done and to enlighten other people.
Which stage of the lytic cycle kills the host cell? A-the injection of the virus’s genetic material B-the replication of the virus inside the host cell C-the release of the replicated viruses D-the attachment of the virus to the host cell
Answer:
C. The release of the replicated viruses
Explanation:
The 5th stage of the cycle, where the virus is released, is the one that kills the host cell.
This is the "Lysis" stage, where the phages are released from the cell and the cell is destroyed from the viruses.
The tentacles of an octopus and the limbs of a lizard perform the same function but have a different evolutionary lineage. Therefore, they are . The front legs of a cat and the arms of a human share a bone structure that suggests a common evolutionary lineage. Therefore, these skeletal structures are .
Answer:
1. Analogous
2. Homologous
Explanation:
The tentacles of an octopus and the limbs of a lizard perform the same function but have a different evolutionary lineage. Therefore, they are Analogous.
Analogous features/parts comparison are usually associated with the same functions but a different evolutionary lineage.
The front legs of a cat and the arms of a human share a bone structure that suggests a common evolutionary lineage. Therefore, these skeletal structures are homologous.
Homologous on the other hand involves having a common evolutionary lineage as a result of certain unique characteristics.
Answer:
1. Analogous
2. Homologous
Explanation:
I just took the test.
"Cystic fibrosis is a genetic disorder. Define what a genetic disorder is? Can you name two other genetic disorders?"
Answer:
A genetic disorder is a disease that is caused by the change in the sequence of DNA. Down Syndrom and Huntington disease are two examples of genetic disorders.
Explanation:
A genetic disorder is a change in the sequence of the DNA that results in a disease or condition. These disorders are caused by the mutation of one or multiple genes, by damage in chromosomes, or by environmental factors.
Down syndrome is a known genetic disorder where there is an extra copy of chromosome 21 instead of the two copies. People with Down Syndrom have intellectual difficulties and a different physical complexion that can lead to some problems.
Huntington disease is a genetic disorder that causes the degeneration of neurons, which brings emotional, cognitive, and movement problems that worsen with time since it is a progressive disease.
A group of students is observing these two species of squirrels and forming conclusions about how they are alike and different. Which type of investigation is this group doing.
A. Controlled
B. Experimental
C. Descriptive
D. Comparative
How can blood pressure affect the flow of blood?
Answer:
High blood pressure can damage your arteries by making them less elastic, which decreases the flow of blood and oxygen to your heart and leads to heart disease.
Which type of cell is more complex?
Answer:
eukaryotic cause it has more stuff than prokaryotic
Explanation:
Humans autosomal cells have two copies each of 23 unique chromosomes. Match each of the following cell division events and cell types according to the number of chromatids present. Whereas other events may also be misplaced, you have not matched all of the cell types and events that contain 23 chromatids. A chromatid number of 23 is observed in haploid gametes produced during the second meiotic division.
Answer:
Please see below
Explanation:
The number of chromatids have been stated with the respective event when it occurs in that particular number in the following way:
23 chromatids
primary oocyte arrested prior to ovulation
spermatozoa
46 chromatids
oogonium prior to S phase
92 chromatids
secondary polar body
Anorexia nervosa has been associated with a primary dysfunction of which structure of the brain?
Answer:
This is an eating disorder,mostly common in ladies especially in models,where there is morbid fear of getting overweight or adding extra weight and therefore leading to lack of appetite
Explanation:
Anatomically,patience with this condition has Increase in the mass of white and grey matter of the brain.These are the areas of cerebral cortex.There is also increased in the volume of CSF during the examination of the brain of such individual,Cerebrospinal fluid is the protective and nutrient contained fluid which bathes the brain and spinal cord.
Furthermore,there was a decrease in the region of the left hypothalamus which controls hunger,and the left Inferior parietal lobe.The latter controls language perceptions and mathematical computation and image of the body perceptions by the brain.
Belumia nervosa,Binging are other eating disorders
Photosynthesis is possible only in the stems. True False
Answer:
false
Explanation:
it happens in the whole plant
Answer:
False
Explanation:
It occurs in all parts of the plant except root hair cells.