When there are two or more reactants, the active site provides a template on which the substrates can come together in the proper orientation for a reaction to occur between them 2.as the active site of an enzyme clutches the bound substrates, the enzyme may stretch the substrate molecules toward their transition state form, stressing and bending critical chemical bonds to be broken during the reaction. because ea is proportional to the difficulty of breaking the bonds, distorting the substrate helps it approach the transition state and reduces the amount of free energy that must be absorbed to achieve that state. 3.the active site may also provide a microenvironment that is more conducive to a particular type of reaction than the solution itself would be without the enzyme. ex: if the active site has amino acids with acidic r-groups, the active site may be a pocket of low ph in an otherwise neutral cell. in such cases, an acidic amino acids may facilitate h+ transfer to the substrate as a key step in catalyzing the reaction. 4. amino acids in the active site directly participate in the chemical reaction. sometimes this process even involves brief covalent bonding between the substrate and the side chain of an amino acid in an enzyme. subsequent steps of the reaction restore the side chains to their original states so that the active site is the same after the reaction was before?

Stem cell research offers great promise for understanding basic mechanisms of human development and differentiation, as well as the hope for new treatments for diseases such as diabetes, spinal cord injury, Parkinson’s disease, and myocardial infarction. However, human stem cell (hSC) research also raises sharp ethical and political controversies. The derivation of pluripotent stem cell lines from oocytes and embryos is fraught with disputes about the onset of human personhood. The reprogramming of somatic cells to produce induced pluripotent stem cells avoids the ethical problems specific to embryonic stem cell research. In any hSC research, however, difficult dilemmas arise regarding sensitive downstream research, consent to donate materials for hSC research, early clinical trials of hSC therapies, and oversight of hSC research. These ethical and policy issues need to be discussed along with scientific challenges to ensure that stem cell research is carried out in an ethically appropriate manner. This article provides a critical analysis of these issues and how they are addressed in current policies.

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.

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.  

Answer:    Johannes Kepler

Explanation:  Johannes Kepler was the German astronomer and mathematician who first wrote the defense of Copernicus's heliocentric system. He was one of the most important scientists during the scientific revolution, and is best known for his three laws of planetary motion. He found that all planets, when rotating around the sun, are moving along elliptical paths, not circular ones.

Answer: cohesive , hydrogen

Explanation: Cohesion is the force of attraction between similar molecules. Water molecules are cohesive due to hydrogen bonding. This property of water allows the molecules of water to stick to each other.

Water forms hydrogen bond due to the presence of hydrogen atom and a electronegative oxygen atom. The formation of hydrogen bonds leads to the cohesive nature of the substance allowing plants to transport water from their roots up through stems to their leaves due to capillary action which is also a result of hydrogen bonding.

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.

Final answer:

Cilia are short, numerous structures on a cell's surface designed to move cells or substances on a cell's surface, while flagella are fewer and longer, used to propel the cell itself. Despite these differences, both have a similar '9 + 2 array' microtubule structure that facilitates movement.

Explanation:

Cilia and flagella differ from each other primarily in terms of their length and number on a cell's surface. Cilia are short, hair-like structures and are found in large numbers along the entire surface of the plasma membrane. They can move entire cells or substances along the outer surface of the cell, like in the lining of the Fallopian tubes or the respiratory tract. On the other hand, flagella are long, hair-like structures that extend from the plasma membrane, typically with just one or a few per cell, and are used to move the entire cell itself, as seen in sperm cells or certain microorganisms like Euglena.

Despite these differences, both cilia and flagella share a common structural feature known as the "9 + 2 array" of microtubules. This describes the arrangement where a ring of nine microtubule doublets surrounds a pair of single microtubules at the center. This shared structure underlies their ability to perform their locomotive functions.

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.

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.

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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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:

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

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Final answer:

Cells like algae and protists avoid lysis in fresh water by using contractile vacuoles to expel excess water and by actively adjusting their internal solute concentrations.

Explanation:

Cells such as algae and protists avoid lysis in fresh water through several mechanisms to manage osmotic pressure and maintain water balance. The presence of a contractile vacuole is a critical adaptation in many freshwater protists, such as paramecia. This specialized vacuole functions to expel excess water that enters the cell via osmosis, due to the higher solute concentration inside the cell compared to the surrounding fresh water. This process involves the contractile vacuole collecting water from the cytoplasm via its surrounding canals, and then, when full, pumping the water out of the cell through a specialized pore. Additionally, some protists can adjust their internal solute concentrations by actively pumping salts in or out of the cell, a strategy that helps in coping with changes in environmental solute concentrations.

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).

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.

The first blank can be filled with the pelagic zone and the second blank can be filled with the intertidal zone.  

The pelagic zone comprises the water column of the open ocean and can be further differentiated into the regions by depth. Dolphins are witnessed in the pelagic zone of the ocean. The intertidal zone also called littoral zone, refers to the region of the seabed and foreshore, which comes into contact with the air at low tide and submerged at high tide, shorebirds and crabs are witnessed in this zone.  

water moves down after passing the zone of aeration