Why might it be very difficult to visualize the separation of cis- and trans-2-butene by tlc?
The separation of cis- and trans-2-butene by TLC is difficult due to the slight difference in polarity and the potential for interconversion, which can make the polarity difference insignificant for separation purposes.
Explanation:To address the question of why it might be very difficult to visualize the separation of cis- and trans-2-butene by TLC (Thin Layer Chromatography), we must consider their physical and chemical properties. TLC relies on the different polarities of compounds to carry out separation. Since cis-2-butene is a polar molecule and trans-2-butene is nonpolar, we might expect TLC to be able to separate them effectively. However, the difference in polarity might not be sufficient to achieve a clear separation, due to their similar molecular structures and the fact that both compounds can interconvert when sufficient energy, such as heat or light, is applied, potentially complicating the TLC process.
The difficulty in separating these isomers arises from the fact that cis- and trans-isomers have similar boiling points and other physical properties despite their difference in polarity, which may not be distinct enough to be resolved by TLC. Generally, the stationary phase in TLC might not interact significantly differently with each isomer to produce a clear distinction between their spots on the TLC plate.
As a child, Alex was short for his age. But during his teenage years, his height increased and he surpassed most of his friends. What must have occurred to create this growth spurt? A.Cells in Alex’s body underwent meiosis to create new tissue.
B.Cells in Alex’s body underwent mitosis to create new tissue. C.Cells in Alex’s body produced haploid cells that formed new muscle. D.Cells in Alex’s body produced new tissue by budding.
The answer would not be A. I got it wrong on Plato.
Ans. (B).Cells in Alex’s body underwent mitosis to create new tissue.
Mitosis is defined as a type of cell division, which is associated with the growth, development, and repairing of damage tissues. During mitosis, one parent cell gives rise to two identical daughter cells. As mitosis increases the cell numbers and makes new tissues, it is responsible for growth and development of the body.
Thus, the correct answer is option (B).
The most common type of distribution pattern(s) in nature is(are) _______.
Answer:
The given blank can be filled with cluster.
Explanation:
The most general pattern of distribution in nature is clustered. This is because the resources are distributed intermittently in the environment. Thus, if the resources are rare, or because of the social element, the individuals would cluster together in the region where these factors become auspicious.
The least common kind of distribution pattern is termed as the random distribution, and it is evident in homogenous surroundings that are very rare. The other kind of pattern known as regular distribution is the outcome for direct social associations amongst the individuals within the population, or for a resource.
Dr. stott is a developmental psychologist who studies how environmental influences impact gene expression without changing dna. what does she research? chromosomes heredity genome epigenetics
Dr. Stott is researching epigenetics, studying how environmental factors can change gene expression without altering the DNA sequence. This work can greatly impact understanding of development, health, and behavior.
Explanation:Dr. Stott is a developmental psychologist who conducts research in the field of epigenetics. Epigenetics involves the study of changes in organisms caused by modification of gene expression rather than alteration of the genetic code itself. This means Dr.Stott investigates how environmental factors such as diet, stress, and physical activity can modify the function of genes without altering the DNA sequence. These modifications can have profound implications for an organism's development, health, and even behavior, leading to research on a broad range of topics from developmental disorders to cancer.
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Dr. Stott is a developmental psychologist who researches how environmental influences impact gene expression without changing DNA. This field of study is called epigenetics.
Explanation:This field of study is called epigenetics, which focuses on heritable changes in the genome that do not affect the underlying DNA gene sequences. Epigenetics explores how the same genotype can lead to different phenotypes due to environmental factors. Dr. Stott's research aims to understand how these changes in gene expression occur and their impact on development.
Hence, the answer is epigenetics.
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In 1961, two neurosurgeons were able to reduce seizure activity in epileptic patients by severing the corpus callosum. the neurosurgeons were:
The two neurosurgeons who were able to reduce the seizure activity that epileptic patients has experienced with the use of the method of severing the corpus callosum of the patients were namely Vogel and Bogen. They were able to reduce the seizure activity of these patients.
Answer:
Philip Vogel and Joseph Bogen
Explanation:
Bears eat berries, humans, and large fish; large fish eat smaller fish and insects; humans eat bears, large fish, and berries; venus flytraps eat insects. the scenario described here is an example of ______.
a.an ecosystem
b.parasitism
c.a food chain
d.a food web
The birth of natural science can be traced to important assumptions made by thinkers in the aegean basin 2500 years ago. which answer best summarizes these choices?
DNA would be found within which classification of biological molecules?
A.lipids
B.Carbohydrates
C.nucleic acids.
D Proteins
Answer: Nucleic acid
Explanation: Deoxyribonucleic acid are nucleic acid that consists of nucleotides which are monomers made of a pentose sugar, nitrogenous bases and a phosphate group.
Nucleic acids are most important of all the biomolecules that is found in the body. They are found in abundance.
Their main function is transmission of information from one generation to another generation.
What three substances can raise blood cholesterol level and why is this a concern?
Wolverines spread across their range, with each individual patrolling a territory of about 320 km. what type of dispersion do woverines represent?
In the given case, the wolverines are demonstrating a uniform pattern of dispersion.
• The distribution pattern or the dispersion pattern of a population illustrates the alignment of the individuals within a habitat at a specific point in time. The general kinds of dispersion patterns are random, clumped, and uniform.
• The spreading of the organisms takes place in a fairly regular pattern in uniform distribution.
• This takes place when the individuals need to compete for a limiting resource like food or water.
In the given question, the wolverines are spreading uniformly to patrol their territory, thus, demonstrating a uniform pattern of dispersion.
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Which of these animals is considered a model for punctuated equilibrium? whale ammonite archaeopteryx
Yes, it is an Ammonite.
Respiration releases carbon dioxide, the molecule needed for photosynthesis.
a. True
b. False
High diagram shows the valence electron pattern for a carbon atom
The right answer is A.
The carbon having 6 electrons adopts an electronic configuration in the ground state 1s2 2s2 2p2. It has four electrons on its valence layer, which allows it to form four covalent bonds, including "sigma" (first bond with one atom) or "pi" type bonds (second or third bond). "Pi" type links are always accompanied by a "sigma" type link. The recovery of electronic functions in a "pi" link is weaker. These links are therefore less "solid".
Scientists want to place a telescope on the moon to improve their view of distant planets. The telescope weighs 200 pounds on Earth. What will happen to the weight of the telescope when it reaches the moon?
Answer:
The weight will be about 16.5% of 200= approximately 33 pounds in moon
Explanation:
Mass is defined as the quantity of matter that is present within a body whereas weight is defined as the quantity of mass that is present in a body on which the force acts.
Moon is very smaller in size when compared to the earth. Because of its smaller size, the moon has a smaller amount of mass and hence a low gravitational force. According to the research, it has been observed that any object whose weight is 100 kg on earth is only about 16.5% of it when it is on the moon.
So in the given condition, the telescope that is to be sent to the moon is 200 pounds on earth, but it will be about only 33 pounds as it reaches the moon.
Most plant proteins do not match our needs for essential amino acids and therefore are called _______________ proteins.
During summer, cities located near the coast are ________ than those in the interior at the same latitude, while in the winter they are ________.
Answer:
Cooler, Warmer
Explanation:
The ocean water bodies has the high heat capacity as a result of which the oceans and seas are heated and cooled at a much slower rate, in comparison to the land areas. The places that are near to the ocean bodies generally experiences a cooler type of temperature during the day time and it gradually increases as one moves away from the oceans towards the inland areas.
The ocean has the capacity to store heat during the summer season, and it eventually releases during the winter. This cycle repeatedly occurs, as a result of which during winter, the cities near the coast are usually warmer and on the other hand, these cities are colder during summer.
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Lipids, proteins, polysaccharides, and nucleic acids are large polymers that make up the different components of our bodies. Which element can be found as the backbone of all of these macromolecules?
1.Carbon
2.Phosphorus
3.Oxygen
4.Nitrogen
Carbon is the fundamental backbone element in macromolecules such as lipids, proteins, polysaccharides, and nucleic acids.
It's unique ability to form up to four covalent bonds makes it perfect to act as the central framework for complex molecules that are essential to life.
A scientist who studies living things in the environment 1 point
answer to the quick check is
A / B / D / B / D / A / C / B / C / C
A scientist who studies living organisms in their environment is known as an ecologist. Ecology, a branch of biology, focuses on the interactions among living organisms and their environment, integrating various scientific disciplines. Ecologists can operate in a range of sectors including research, education, and policy-making.
Explanation:A scientist who studies living things in the environment is typically known as an ecologist. The field of ecology is a branch of biology that focuses on the interactions of living organisms with one another and with their non-living environment. Ecologists seek to understand the distribution and abundance of living things, and their research often integrates various scientific disciplines, such as molecular biology, physiology, evolution, biodiversity, geology, and climatology.
For instance, an ecologist might work in a marsh studying the interactions of several populations of birds, crabs, and grasses without studying the water or air quality. They could also conduct their research in natural environments as diverse as the local stream or the hydrothermal vents at the bottom of the Pacific Ocean.
Having a career in ecology can contribute to many areas of human society, and there are various specializations one might pursue. For instance, some ecologists focus on managing natural resources, while others may work in education, policy-making, or research roles. Their work influences human wellness and habitat, food sources, and more.
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The nurse is assigned to watch the cardiac monitors in the constant care unit and notes four different clients displaying arrhythmias. which arrhythmia is the nurse's highest priority
The nurse’s highest immediate priority is ventricular fibrillation (VF) due to its life-threatening nature. Sinus bradycardia, atrial flutter, and sinus tachycardia, are generally less immediately critical. Option D is correct.
This is because VF is a life-threatening condition where the heart's electrical activity becomes disordered, causing the ventricles to quiver ineffectively instead of pumping blood. Immediate action is required as VF can lead to cardiac arrest and sudden death if not treated promptly.
Here are brief explanations for why the other arrhythmias are less immediately critical:
Sinus bradycardia at a rate of 54 beats/min: This is generally not symptomatic unless the patient shows signs of weakness, fatigue, or dizziness.Atrial flutter: Although it needs treatment, it doesn't usually result in immediate life-threatening situations.Sinus tachycardia at a rate of 108 beats/min: While this is abnormal, it often requires addressing the underlying cause rather than immediate emergency intervention.Complete question as follows:
The nurse is assigned to watch the cardiac monitors in the constant care unit and notes four different patients displaying arrhythmias. Which arrhythmia is the nurse's highest immediate priority?
A) Sinus bradycardia at a rate of 54 beats/min
B) Atrial flutter
C) Sinus tachycardia at a rate of 108 beats/min
D) Ventricular fibrillation
even though larry could stand to lose a few pounds and step up his aerobic activity, he maintains ____ fitness with an active lifestyle and moderate-intensity physical activity.
which way does water move once it passes through the zone of aeration?
water moves down after passing the zone of aeration
a. True
b. False. all members of a food web are equal in abundance and in their relative effects on one another.
The statement can be categorized as "False".
The food chain means that all the living things get the food and energy or nutrition pass from one to another. As you go up the food chain the abundance which the statement says stays equal actually reduces and diminishes because of loss of energy through normal procedures, for example, respiration etc.
What happens to the energy in an ear of corn once a cow eats it?
a. Most of the energy from the corn is available to a human who eats meat from the cow.
b. The cow gives all of the corn’s energy off as heat energy.
c. It uses some of the energy for life processes, some of the energy is stored in the cow's tissues, and some of its energy is given off as heat energy.
d. The cow uses all of the corn’s energy for life processes.
The plasma membrane is composed of several different macromolecules which macromolecule serves as the fluid interface between the intracellular and extracellular environments
Which type of scientist studies cultures? A. Life scientist B. Mathematician C. Physical scientist D. Social scientist
The male structure, known as the _____, is comparable to the ovaries in females.
The human brain is especially sensitive to
What forms when one oceanic plate is forced beneath another plate? Select one: a. ocean ridges b. a rift valley c. an ocean basin d. a subduction zone and deep sea trench
Answer:
Option d, A Subduction Zone
Explanation:
A subduction zone is formed when two plates collide and one sinks below the other. Thus, option A is incorrect
The other options are incorrect because
Oceanic ridge is the upliftment of mountains due to the convection currents beneath the ocean.
Rift Valley is formed by the subsidence of land mass due to the action of fault or rift.
Ocean basin and deep sea trench is a depression in the earth surface
Typhoid fever is caused by bacteria in contaminated food or drink in 1903 an outbreak of typhoid fever in Ithaca killed almost 80 people in addition more than 1,000 Ithaca residents became sick with the disease the population shares the public water source which type of limiting factor was involved in the typhoid outbreak that occurred in Ithaca?
Answer:
density-dependent factor
Explanation:
The tree-like branches of a neuron that receive information from other neurons are called