Dr. jackson measures how long an infant looks at different visual stimuli. which experimental method is this?
Which form of birth control protects 100 percent against pregnancy and sexually transmitted infections?
Which macromolecule provides a person with most of the energy that is needed for daily activities?
a.carbohydrates
b.lipids
c.nucleic acids
d.proteins
Which best describes the data ?
They are precise and reproducible.
The data is not accurate but reproducible. Option d is the correct answer.
Accuracy refers to how close a measurement is to the true value. Reproducibility refers to how consistent a measurement is when repeated under the same conditions.
In this case, the data is reproducible because all four measurements are close to each other. However, the data is not accurate because the average of the four measurements (17.98) is different from the true value (23.0).
Here is a table summarizing the accuracy and reproducibility of the data:
Experiment Measurement Accuracy Reproducibility
1 17.8 No Yes
2 18.0 No Yes
3 17.9 No Yes
4 18.2 No Yes
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Describe the chemical structure of a cell membrane
The cell membrane is made up of a double layer of phospholipids, often known as a lipid bilayer, with proteins and cholesterol molecules embedded within. These components are arranged in a versatile fluid mosaic model allowing for flexibility and movement of the cell.
Explanation:The cell membrane, also known as the plasma membrane, is the outer boundary of a cell. Its primary function is to protect the cell from its surroundings. It's composed mainly of a double layer of phospholipids (a lipid bilayer). Each phospholipid molecule has a hydrophilic (water-loving) head and two hydrophobic (water-fearing) tails. These phospholipids arrange themselves so that the hydrophilic heads face outwards towards the watery environments, both inside and outside the cell, while the hydrophobic tails face each other inwards.
Embedded within this phospholipid bilayer are various proteins and cholesterol molecules. The proteins have various functions, including the transport of molecules across the membrane. The cholesterol molecules help maintain the fluidity (flexibility) of the membrane. This entire structure is also called the 'fluid mosaic model' of the cell membrane because the proteins are embedded in a sea of lipids, and everything can move around fluidly.
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basic units of the dna molecule composed of a sugar, phosphate, and one of four dna bases is called a(n):
Final answer:
The basic units of DNA made up of a sugar, a phosphate group, and a nitrogenous base are known as nucleotides. These nucleotides link together to form DNA's double helix structure.
Explanation:
The basic units of the DNA molecule, composed of a sugar, phosphate, and one of four DNA bases, is called a nucleotide. Every nucleotide is made up of three essential components:
A nitrogenous base, which can be either a purine (adenine [A], guanine [G]) or a pyrimidine (cytosine [C], thymine [T]).
A pentose sugar, specifically deoxyribose in DNA.
A phosphate group (–PO4³–).
These nucleotides are the building blocks of DNA and RNA, arranging into sequences to encode genetic information. Nucleotides link together to form the DNA double helix structure, where the sugar-phosphate backbone is on the outside, and the nitrogenous bases are on the inside, pairing with complementary bases through hydrogen bonding.
An animal cell (left) and a plant cell (right) are shown. Which organelle, labeled X in the diagram, is found in both plant and animal cells? A. The cell wall B. The cell membrane C. Mitochondria D. Ribosomes
The rigth answer is cell membrane.
A cell membrane distinguishes a fundamental cellular structure formed from a double layer of phospholipids associated with other lipids, proteins and carbohydrates.
The membrane of the cell, also known as the plasma or cytoplasmic membrane, is a biological membrane (biomembrane) that separates the interior of all cells from the external environment.
The plasma membrane, cytoplasmic membrane or plasmalemma delimits the cytoplasm of the cell. Organelles are surrounded by a single cell membrane (peroxisomes, lysosomes, endoplasmic reticulum, dictyosomes, vacuole) or double (nucleus, plastids).
Answer:
the answer is cell membrane on edg
Explanation:
What are the global commons? Are these being used wisely? Why or why not? What can people do to use these resources most wisely?
The global commons refer to shared resources that are not owned by any individual or country but are essential for the well-being of humanity. However, they are not being used wisely due to the tragedy of the commons, lack of global governance, and socioeconomic factors. To use these resources most wisely, sustainable practices, international cooperation, and education and awareness are crucial.
Explanation:The global commons refer to shared resources that are not owned by any individual or country but are essential for the well-being of all of humanity, such as the atmosphere, oceans, and outer space. These resources are limited in nature and can be easily depleted if not used wisely. However, they are not being used wisely for several reasons.
Tragedy of the Commons: The tragedy of the commons occurs when individuals prioritize their own short-term interests over the long-term sustainability of the global commons. Everyone has an incentive to exploit these resources as much as possible, leading to their depletion.Lack of Global Governance: There is a lack of effective global governance to regulate the use of global commons and ensure their sustainable management. As a result, exploitation and mismanagement persist.Socioeconomic Factors: Socioeconomic factors such as poverty, overpopulation, and inequality contribute to the unsustainable use of global commons. People may resort to exploitative practices to meet their basic needs.In order to use these resources most wisely, individuals and governments can take certain measures:
Sustainable Practices: Promote sustainable practices that prioritize the long-term preservation and conservation of the global commons. This includes reducing carbon emissions, implementing sustainable fishing practices, and protecting biodiversity.International Cooperation: Foster international cooperation and collaboration to develop and enforce agreements and policies that ensure the responsible use and management of global commons.Education and Awareness: Promote education and awareness about the importance of global commons and the need for their wise usage. This can help individuals make informed decisions and advocate for sustainable practices.Drag each label into the appropriate position to indicate whether each given item is related to carbohydrates, proteins, or lipids.
Large predatory fish usually are found at the 3rd and 4th trophic level of an energy pyramid. what does this mean in terms of energy loss
Final answer:
Large predatory fish are located at the 3rd and 4th trophic levels of an energy pyramid. There is a significant loss of energy as it moves through the trophic levels.
Explanation:
Large predatory fish typically occupy the 3rd and 4th trophic levels of an energy pyramid. This means that they consume organisms from lower trophic levels, such as herbivores and smaller carnivores, to obtain energy. However, there is a significant loss of energy as it flows through the trophic levels, resulting in less energy being available at higher levels. Only about 10% of the energy from one trophic level is transferred to the next level, with the remaining 90% being used for metabolic processes or lost as heat.
Decreased muscle strength caused by __________ can make it difficult for you to control your car.
muscular dystrophy, because muscular dystrophy is literally the lost of muscle. hope this is an answer choice!
A woman at 41 weeks' gestation is progressing well in labor; however, the nurse notes the amniotic fluid is greenish in color. when questioned by the client for the reason for this, which explanation should the nurse provide?
The nurse should approach the client in a calm way and to explain the greenish amniotic fluid to prevent the woman from being stressed out or to cause an outbreak, the nurse should explain that the greenish amniotic fluid was mostly likely because of a presence of late decelerations in which is indicative of a presence of fetal distress. It is likely because there is a presence of blood flow that is poor or the fetus is has been experiencing poor nourishment or oxygen in which it needs to survive in the mother’s womb and the green fluid was also because of the meconium.
One of the liver's main functions is to detoxify potentially toxic substances. given this information, which organelle would you expect liver cells to have in abundant?
Peroxisomes are organelles found in abundance in liver cells due to their role in detoxifying harmful substances. They contain enzymes that neutralize poisons, such as alcohol and toxic H₂O2 by converting it into harmless substances. Their presence is vital for the liver's function as a main detoxifier in the body.
Explanation:Given the liver's function in detoxifying blood, it contains an abundance of peroxisomes, a type of organelle involved in detoxification processes. Peroxisomes are small, membrane-bound organelles that contain enzymes which neutralize potentially harmful substances such as alcohol. They oversee reactions that produce large amounts of the toxic H2O2, but also contain enzymes that convert this into water and oxygen, rendering these byproducts harmless to the cell.
These organelles work in lipid metabolism and chemical detoxification, and like miniature sewage treatment plants, ensuring toxins are neutralized before they cause cellular damage. In the context of the liver, they play a crucial role in ensuring that blood is detoxified before it travels throughout the body. Thus, given the liver's primary role in detoxification, one can expect an exceptionally high number of peroxisomes in liver cells.
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In a transformation The heat produced by friction is evidence that energy is __________.
In a transformation, the heat produced by friction is evidence that energy is conserved.
How enenrgy is consrved?But altogether, neither new nor lost energy is added to the system. When moving sand makes contact with an obstruction, friction is generated that causes it to stop, and the kinetic energy of the contact is converted to thermal energy or heat.
Energy cannot be generated or destroyed, says the law of conservation of energy, heat produced by friction is evidence that energy is conserved.
The overall quantity of energy is constant during all transformations. All of the initial energy will be accounted for if you sum up all the new forms of energy that result from a transition.
Therefore, in reality, friction's ability to generate heat is proof that energy is conserved.
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Why are different fuels used for different purposes??help please
Why is water considered to be abiotic?
*Because it is not part of the bioshpere
*Because it came from something non living
*Because it is dead
*Because it never lived
The correct answer is "Because it never lived ".
The reason why we consider water as abiotic because it never had life. We term a molecule/compound as biotic only when it is resulted from a living thing. Water has always existed in nature even when there was no life on this earth. So, it simply means that it didn't result from living beings. Water is considered as the non living part of the environment. Also, second option is partially correct because like begets like. But, the first living cell was also evolved from non living components of earth which is an exception to the second statement. So, the most appropriate answer to this question is option 4th "it never lived".
which stage are proteins actually synthesized
What happens when a new data call current scientific explanation into question
Approximately how much more free energy is supplied to the electron transport chain by nadh than by fadh2?
Answer;
8 kilo calories/mole.
Approximately 8 kilo calories/mole more free energy is supplied to the electron transport chain by NADH than by FADH2.
Explanation;
-An NADH molecule produces 3 ATP during the ETC (Electron Transport Chain) with oxidative phosphorylation because NADH gives up its electron to Complex I, which is at a higher energy level than the other Complexes.
-An FADH2 molecule produces 2 ATP during the ETC because it gives up its electron to Complex II, bypassing Complex I.
The _____ system protects soft body organs and provides a solid framework for the body
The answer is ( Skeletal )
how would DNA of a fish compare to DNA of a lion?
The DNA of a fish and a lion would be different because they belong to different species with distinct genetic blueprints. These genetic differences result in the unique characteristics and adaptations seen in each species.
Explanation:The DNA of a fish would differ from the DNA of a lion because they belong to different species. Although both fish and lions are animals, they are not closely related in terms of DNA. The primary reason for this is that fish and lions have different genetic blueprints encoded in their DNA, which determine their distinct physical and behavioral characteristics.
For example, fish and lions have different numbers of chromosomes. Fish typically have a different number of chromosomes than mammals like lions. Additionally, fish have adaptations for living in water, such as gills and fins, whereas lions have adaptations for living on land, such as legs and a specialized digestive system.
In conclusion, the DNA of a fish and a lion would be different because they belong to different species with distinct genetic blueprints. These genetic differences result in the unique characteristics and adaptations seen in each species.
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If a person consumed the upper amdr limit for protein as part of a diet providing 2500 kcalories, approximately how many grams of protein would be ingested?
Which of these vaccines must replicate to stimulate an immune response?
What role does the compound ATP play in cellular activities
Answer:
Adenosine triphosphate (ATP), energy-carrying molecule found in the cells of all living things. ATP captures chemical energy obtained from the breakdown of food molecules and releases it to fuel other cellular processes.
What was the result of collisions between the early Earth and other, smaller protoplanets?
A. Matter within the protoplanets was absorbed and became the Earth’s core.
B. Matter within the protoplanets formed the Earth’s early atmosphere.
C. The trajectory of their motion knocked the Earth into a different orbit.
D. The energy of their motion heated the Earth.
Answer;
C. The trajectory of their motion knocked the Earth into a different orbit.
Explanation;
-The first solid particles were microscopic in size. They orbited the Sun in nearly circular orbits right next to each other, as the gas from which they condensed. Gently collisions allowed the flakes to stick together and make larger particles which, in turn, attracted more solid particles. This process is called accretion.
-The objects formed by accretion are called planetesimals (small planets): they act as seeds for planet formation. At first, planetesimals were closely packed. They coalesced into larger objects, forming clumps of up to a few kilometers across in a few million years, a small time compared to the age of the solar system.
-Once planetesimals had grown to these sizes, collisions became destructive, making further growth more difficult. Only the biggest planetesimals survived this fragmentation process and continued to slowly grow into protoplanets by accretion of planetesimals of similar composition.
The nurse determines that a 61-year-old patient with chronic bronchitis has a nursing diagnosis of "impaired gas exchange," after noting an oxygen saturation of 88%. what is an appropriate intervention to add to the care plan?
Compare the use of carbohydrates and lipids in energy storage.
Three major differences between humans and chimpanzees are that humans are bipedal
we don't have hare everywhere exept our face our hands and feet are opposite.
Imagine. Thar you are small enough to fit inside a cell describe what you think you might observe while you are there
Within a cell, we would find ourselves surrounded by the cell membrane, immersed in cytoplasm, and witness a myriad of biochemical activities conducted by various organelles such as the nucleus and mitochondria.
Explanation:Imagine if we were so tiny that we could fit inside a cell. Once we pass through the cell membrane, we'd find ourselves in a bustling environment. The cytoplasm, a jelly-like substance, fills the space with dissolved substances and myriad structures. We would likely be amazed by the organelles, such as the nucleus, which houses DNA, the mitochondria producing energy, and the endoplasmic reticulum where proteins are synthesized. This complex world is teeming with biochemical activities, all essential for life to exist. Compared to a human cell, the world around us is immense. Just to put it into perspective, around 250 red blood cells can fit on the head of a pin, demonstrating the microscopic scale at which cells exist. Envisioning ourselves inside a cell, we would observe life's fundamental processes unfolding in real time.
What is true of table salt?
A. It Has Only One Element
B. It Has Simple Molecules
C. It Has Radicals
D. It's Is An Ionic Compound
Answer:
The correct answer is D. It's An Ionic Compound
Explanation:
Ionic compounds have to do with those compounds that consist of ions. We see that two elements that are compounds are also ionic when one element is a metal and the other is a non-metal. Table salt is an example of an ionic compound.