Answer:
Attractive forces between particles
Explanation:
There are three states of matter i.e solids, liquids and gases. All three states have different properties. A solid keeps its shape due to attractive forces between particles. These forces are called inter molecular forces. The particles of solid keeps with this force. There are few types of inter molecular forces
Ionic bondsVan-der-Waals dipole-dipole interactionsHydrogen bondingVan-der-Waals dispersion forces.Hence, the correct option is (b) "Attractive forces between particles".
A solid keeps its shape due to the attractive forces between particles.
Solids have their own shape and volume.
The particles that compose them are very ordered and the attractive forces between them are very large, so they do not flow and are very rigid.
About solids:
Its particles are oscillating around "fixed" positions of maximum stability.These positions or distances between atoms, of maximum stability are those that present the maximum attractive forces and the minimum repulsive forces.
The forces between the particles of a solid are high enough so that the cohesion of the crystal is maintained.This is due to the fact that the attractive forces are very intense and the particles are only free to carry out small vibrations and that is why solids have constant shape and volume.
Therefore, we can conclude that a solid keeps its shape due to the very intense attractive forces between particles.
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Which of the following is an assistive bioengineered product?
a. a hip replacement
b. a pair of crutches
c. a graft of artificial skin
d. a vaccination
What does the chloroplast do?
Blood glucose levels are regulated by secretions of ________ by the pancreas.
a. orexin
b. insulin
c. leptin
d. pyy
"as a river enters the ocean, its current diverges and slows. the first particles to settle out of suspension are relatively ________."
During glacial periods, the concentration of carbon dioxide in trapped air bubbles in glacial ice is ___ when compared to the concentration during interglacial periods. lower much higher higher the same
During glacial periods, the concentration of carbon dioxide in trapped air bubbles in glacial ice is lower compared to interglacial periods. Ice core data shows a range of about 180 ppm during glacial maxima to 280 ppm during interglacials.
During glacial periods, the concentration of carbon dioxide (CO2) in trapped air bubbles in glacial ice is lower when compared to the concentration during interglacial periods. This is evidenced by ice core data which shows that CO2 concentrations varied between about 180 parts per million (ppm) during glacial maxima and 280 ppm during interglacials. The lower levels of CO2 during glacial periods are linked to cooler global temperatures and are a result of various biological and geochemical processes.
During the last Ice Age, for example, CO2 levels were below 200 ppm and average temperatures were significantly colder than today. Studies, such as those involving foraminifera and ice core records, have demonstrated a tight connection between climate and the carbon cycle, indicating that changes in atmospheric CO2 concentrations can influence global climate patterns, as well as be affected by them.
The ____ is/are involved in the synthesis of lipids.
In the above study, the investigators determined that a low concentration of DNP increased the average life span from 719 days (Control) to 770 days (DNP). If the U.S. population has an average life span of 79 years, then how many years would be added if the same percentage increase were observed?
Express your answer using two significant figures.
Answer:
Increase in average life span of U.S. in terms of years is [tex]5.6\\[/tex] years
Explanation:
The controlled average life span is [tex]719\\[/tex] days
The DNP average life span is [tex]770\\[/tex] days
Increase in the average life span is
[tex]770 - 719\\= 51\\[/tex] days
Rate of increase of average life span after using DNP
(Change in life span in day [tex]/\\[/tex] Base average life span) [tex]* 100\\[/tex]
[tex]= \frac{51}{719} * 100\\= 7.09\\[/tex] %
It is given that the average life span of US people will also increase by the same rate, then the new average life span would be
Base average life span [tex]+\\[/tex] Increase in average life span
[tex]= 79 + ((\frac{7.09}{100} ) * 79)\\= 84.60\\[/tex]
So the increase in average life span of U.S. in terms of years is [tex]5.6\\[/tex] years
What is the advantage of the rough surface lining of the intestine?
Final answer:
The rough surface of the intestine, characterized by villi and microvilli, greatly expands the surface area for digestion and absorption, slows the passage of chyme, and ensures efficient nutrient uptake into the blood and lymph vessels.
Explanation:
The advantage of the rough surface lining of the intestine, such as the villi and microvilli, is that it significantly increases the surface area available for nutrient absorption. The mucosa of the small intestine is wrinkled and covered with villi, which number about 20,000 per square inch, and each villi is topped with even finer projections called microvilli, further boosting the surface area. This anatomy allows for maximum exposure to digestive enzymes and efficient absorption of nutrients into the bloodstream.
These structures not only enhance the surface area but also slow down the passage of chyme, providing more time for digestion and absorption of nutrients. The internal structure of each villus includes a dense network of blood and lymph vessels, which transport the absorbed nutrients throughout the body. Hence, the bumpy interior of the intestines, which can be likened to a shag carpet with folds, is foundational to the digestive and absorptive functions of the small intestine.
Overall, this complex interior design allows for a staggering increase in surface area – up to 600 times compared to a smooth tube – which is crucial for effective nutrient uptake. More surface area equates to more interaction with enzymes and nutrient molecules, facilitating a more efficient and thorough absorption process.
If the gametes produced by a given organism contain 6 chromosomes, how many chromosomes are found in that organism's body cells?
One of the nurses describes a disorder by telling the group that it is common in children during the summer when it is hot or when the child is overdressed. which disorder is the nurse most likely referring to?
"________________ measures blood flow to brain areas in the active brain."
Recurrent epidemics and widespread diarrhea, which kill millions of children each year, result from __________.
List two functions of territory in the animal kingdom and provide one example of how territory in human culture is different.
A mutation that causes resistance in a population of beetles is an example of _______.
a.
macroevolution
b.
microevolution
c.
migration
d.
reproduction
What structures connect each spinal nerve to the spinal cord?
What will change if you permanently increase the extracellular K+ concentration? (more than one answer is possible)
a. the amplitude of action potential
b. the resting membrane potential
c. the membrane capacitance
d. the permeability of the neuron cell
e. the k+ conductance
The correct answer is option (a.) the amplitude of action potential, (b.) the resting membrane potential and (e.) the K+ conductance.
Increasing the extracellular K+ concentration will depolarize the cell, leading to a less negative resting membrane potential. This change will decrease the resting membrane potential closer to the equilibrium potential for K+. Consequently, it will also decrease the electrochemical gradient for K+ ions and reduce the driving force for K+ efflux. As a result, the K+ conductance will decrease. Finally, the amplitude of the action potential may decrease because the smaller electrochemical gradient for K+ ions will lead to a smaller K+ efflux during repolarization.
The incorrect options are:
c. The membrane capacitance: The membrane capacitance refers to the ability of the cell membrane to store charge. Increasing the extracellular K+ concentration does not directly affect membrane capacitance. Instead, it primarily affects the electrical properties of the membrane through changes in ion concentrations and permeability.
d. The permeability of the neuron cell: Increasing extracellular K+ concentration primarily affects the resting membrane potential and the electrical properties of the cell membrane, but it doesn't directly alter the permeability of the neuron cell. Permeability changes typically occur due to alterations in ion channels or membrane properties, not solely due to changes in extracellular ion concentrations.
For many people, breakfast cereal is an important source of fiber in their diets. cereals also contain potassium, a mineral shown to be associated with maintaining a healthy blood pressure. an analysis of the amount of fiber (in grams) and the potassium content (in milligrams) in servings of 77 breakfast cereals produced the regression model modifyingabove potassium with caret equals 37 plus 26 fiberpotassium=37+26fiber. if your cereal provides 88 grams of fiber per serving, how much potassium does the model estimate you will get?
Using the regression model equation potassium=37+26fiber, you can estimate the amount of potassium in a serving of cereal. You do this by substituting the amount of fiber (in this case, 88 grams) into the equation. This highlights the nutritious value of breakfast cereal.
Explanation:The question is based on the regression model equation given as potassium=37+26fiber. In this model, potassium is predicted by the amount of fiber present. The number 37 is the constant (also known as the y-intercept), and 26 is the coefficient for fiber. This means that for each additional gram of fiber, potassium increases by 26 milligrams.
To find out how much potassium you get from cereal with 88 grams of fiber, plug the value into the equation: potassium = 37 + 26*88. Solving this gives you the estimated potassium content. It demonstrates the vital role of breakfast cereal as a source of crucial nutrients and emphasizes the importance of a balanced diet.
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Imagine your forearm, hand, and fingers as a giant model of a neuron. based on this model, fingers are to dendrites as _____ is to _____. forearm; cell body hand; axon hand; cell body forearm; myelin
Answer:
Imagine your forearm, hand, and fingers as a giant model of a neuron. based on this model, fingers are to dendrites as hand is to cell body.
Explanation:
Neurons have three basic parts: the dendrites, the axon and the cell body. If we use the forearm, hand and fingers to represent this structure, we can say that the fingers would be the dendrites, the hand is the body of the cell and the forearm the axon.
Dendrites are extensions of the neuron that guarantee the reception of stimuli, leading the nerve impulse towards the cell body. The vast majority of neurons have a large amount of dendrites.
The axon is the extension that ensures the conduction of the nerve impulse. Each neuron has only one axon, which is generally longer than the dendrites.
The cell body is the site of the neuron where the nucleus is present, most of the cell organelles, and where the extensions of that cell depart.
The _____ of an embryo differentiates into the nervous system and the skin.
We know that fetuses can hear before birth because newborns:
According to the Doppler effect, the sound of a police car siren is and pitched as it approaches the observer.
Answer:
On the basis of the Doppler effect, the sound of a police car siren is louder and higher pitched as it move towards the observer.
Explanation:
Whenever the police car with a siren moves towards an individual, the frequency of the siren will increase and the reverse happens when the police car moves away from the person. The individual can listen to the sound of the siren louder and clearer when the car approaches the individual, as the sound is highly pitched when it moves towards the observer. This phenomenon is known as the Doppler effect.
Professionals using electroconvulsive shock therapy (ect) for patients suffering from severe depression have shown that the memory processes of consolidation ________.
The ECT treatment includes electric stimulus used to produce a generalized seizure. Professionals using electroconvulsive shock therapy (ECT) for patients suffering from severe depression have shown that the memory processes of consolidation may take years to return.
name two conclusions that have been drawn about harappan civilization
The Harappan civilization is known for its advanced urban planning and civil engineering, as well as the lack of political power concentration in the hands of hereditary monarchs.
Explanation:The Harappan civilization, also known as the Indus Valley Civilization, was notable for two main aspects. First, it showed a tremendous understanding of urban planning and civil engineering. This is evident from their construction of advanced drainage systems, orderly streets, and the creation of standardized bricks. These discoveries suggest that the society was well-organized and technologically advanced for its time. Second, it is believed that the Harappan civilization did not hold political power in the hands of hereditary monarchs, as was the case with many concurrent civilizations.
Indicative of this is the common culture defined by shared architectural and societal norms, suggesting a unified central authority. Additionally, despite the large size and population of this civilization, the society showed little to no war dominance or monumental architecture used to display power or influence. Instead, the civilization seemed to progress holistically, progressing technologically, artistically, and spiritually.
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Which statement best explains why the development of a new area of science can lead to changes in a theory? A.A new area of science attracts new scientists who study old theories for flaws. B.A new area of science promotes experimentation from a different point of view. C.A new area of science allows old theories to be reworded using new terminology. D.A new area of science encourages scientists to replace old theories with modern ones.
A new area of science can lead to changes in a theory by promoting experimentation from a different point of view(B).
Explanation:The correct answer is (B). A new area of science promotes experimentation from a different point of view. When a new area of science is developed, it often brings along new methods and technologies that allow scientists to explore old theories from a new perspective. This can lead to new experiments and observations, which may either support or challenge existing theories and ultimately lead to changes in them.
When scientists explore new areas of science, they often bring fresh perspectives and innovative methods to their research. This can lead to new experiments and observations that challenge or expand existing theories, ultimately contributing to the evolution and refinement of scientific theories.
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_________, a common mineral found in igneous rocks, is the most abundant mineral in detrital sedimentary rocks.
A tobacco plant is heterozygous for the genes for long stems (Ss), large leaves (Ll), and fibrous roots (Rr). It is crossed with another tobacco plant with genotype ss ll rr. How many of the 80 offspring of this mating will be heterozygous for all three genes? These genes are not linked. Hint: create three separate Punnett squares and use the product rule
In plasma membranes, phospholipids arrange themselves into two layers (bilayer)
In cell f7, create a formula that calculates the salary for joan dickinson. her salary is calculated by adding her base salary (cell b7) to her total bonus (cell e7). (hint: do not use the sum function.)
Most connective tissue, including bone, is highly vascular. which anatomical structures in mrs. morgan's compact bone house blood vessels? what sign or symptom in mrs. morgan's case is directly related to disruption of these structures by her bone fractures? how is the sign or symptom related to these anatomical structures?
The blood vessels are both housed by the Haversian canal and the Bolkmann’s canal.
The given info that she is bleeding so abundantly only means that she has a hemorrhage. Hemorrhage is the loss of blood due to rupture walls in the blood vessels.
This sign is related to these structures since one of the canals was actually ruptured when her bone was fractured and then forced out of the skin.
Which of the following events represented a distribution in access to the energy source needed by an organism?