Final answer:
Histidine, with a pKa of around 7, is the amino acid whose side chain is most often involved in proton transfer during enzymatic catalysis due to its ability to exist in both protonated and deprotonated forms at physiological pH.
Explanation:
The side chain of histidine has a pKa in the physiological pH range and is therefore often involved in proton transfer during enzymatic catalysis. The pKa of the protonated histidine residue is approximately 7, which allows histidine to exist in both protonated and deprotonated forms within physiological conditions. This unique property makes it an ideal candidate to act as proton donor-acceptor groups in the active sites of enzymes. Histidine is commonly found in such roles in biochemical reactions because enzymes rely on the specific protonation states of amino acid residues to properly function.
Imagine a root of a cotton plant growing in the upper horizon of an irrigated soil in california's imperial valley. as the root attempts to draw water molecules from this soil what forces (potentials) must it overcome? if this soil were compacted by a heavy vehicle, which of these forces would be most affected?
A root of a cotton plant must overcome various potential forces such as gravitational forces that pulls water downward, matric forces where there is an adhesion of water molecules from a soil and osmotic forces where attracting water in the presence of large amount of soluble salts in the mixture of soil.
If the soil were compacted by a heavy vehicle, the matric forces would be mostly affected for compaction will result to increase matric forces due to reduced size of pores of the soil making it more difficult to draw water from a solid surface.
A cotton plant's root must overcome gravitational, matric, and osmotic potentials to draw water from the soil. Compaction by heavy vehicles primarily affects the matric potential by reducing soil permeability. This could also affect root water uptake by altering the hydraulic gradient and conductivity.
To draw water molecules from the soil, a root of a cotton plant must overcome several forces or potentials, such as gravitational potential, matric potential, and osmotic potential.
Gravitational potential is the force due to gravity pulling on the water. The soil must counteract this to prevent all water from draining away. Matric potential is the soil's adhesion and cohesion forces acting on water, which plants must overcome to uptake water. For osmotic potential, the presence of solutes like salts means plants face more difficulty drawing water into roots. The Imperial Valley's soil, known for salinization, could affect osmotic potential.
If the soil is compacted by a heavy vehicle, the most affected force is the matric potential. Soil compaction reduces pore space, making it harder for roots to access water due to reduced soil permeability. Compaction could also affect the rate of root water uptake due to changes in the hydraulic gradient and soil hydraulic conductivity.
Primates are distinguished from other mammals by __________.
The original pith is still located in the center of the stem (inside the vascular bundles). What type of cells makes up the pith?
Parenchyma cells
Explanation;The pith is a part of the Ground tissue together with the cortex. The cortex is located to the outside and/or around the vascular bundles, while the pith is locate in the center of the stem. Both the cortex and pith are composed mainly of parenchyma cells. On the other hand collenchyma cells give support to the stem and may occur under the epidermis in the cortex.Pith is composed of soft, spongy parenchyma cells, which store and transport nutrients throughout the plant.A particular co-transporter uses the concentration gradient of na+ to move an amino acid into the cell. what immediate effect would raising the extracellular na+ have? it would…
a. increase the amino acid's rate of entry into the cell.
b. block the movement of the amino acid into the cell.
c. block the na+ / k+ pump.
d. speed up the na+ / k+ pump.
e. reverse the direction of the na+ / k+ pump so that it moves na+ and k+ down their concentration gradients.
Scientists at Russia’s Vostok Station in eastern Antarctica drilled the longest ice core ever recorded. They compiled this graph using the data collected from the ice core. This plot shows the temperature, carbon dioxide (CO2), and dust levels up to 400,000 years ago. Which statement best summarizes the data in the graph?
Answer:
The answer is D.
Explanation:
Why is it necessary to rinse the inside of erlenmeyer flask with di water periodically?
Which is the best example of a pure substance? a) peanuts b) milk c) gold d) air?
Correct option is C. Gold is the best example of a pure substance as it is an element composed of a single type of atom. Other examples like peanuts, milk, and air are mixtures. Pure substances have a fixed chemical composition and distinct properties, while mixtures consist of two or more pure substances.
The best example of a pure substance from the options provided is c) gold. Peanuts, milk and air are all mixtures containing more than one substance. Gold, as an element, consists of only one kind of atom and cannot be broken down into a simpler substance by chemical means, making it a pure substance. Let's elaborate on some of the examples given:
Cardboard is a mixture because it is made of various substances such as cellulose fibers, adhesives, and other additives.
Caffeine is considered a pure substance as it has a fixed chemical composition and characteristic properties.
Tin, an element, is a pure substance constituted entirely of one type of atom.
A vitamin tablet is a mixture because it contains a variety of compounds and often includes fillers or binders.
Helium gas is often very pure, especially when used in scientific applications, and is considered a pure substance.
Which organisms are eukaryotes? sunflower bacteria cow
Answer:
sunflower and cow are eukaryotes
Explanation:
A eukaryotic organism is one who have enclosed nucleus ( i.e nucleus is enclosed with in a membrane). However in a prokaryotes the nucleus is exposed. Bacteria’s have exposed nucleus and thus they are prokaryotic organism. Eukaryotic domain includes animals, plants, algae and fungi as its constituent’s members.
Since sunflower is a plant and cow is an animal, these two lie in the eukaryotic domain of organisms.
please tell me the protons neutrons and electrons of americium
State three ways scientists base their identifications of evolutionary relationships.
A scientist observed the formation of hundreds of maggots and many flies on a rotting meat slice exposed to the environment. What most likely formed the maggots?
A. Water vapor present in the surrounding air
B. Eggs of flies in the surroundings
C. Nutrient crystals in the meat
D. Oxygen in the environment
eggs of flies in the surroundings is the answer.
A 65 year-old male with a history of chronic glaucoma has progressive optic nerve damage and elevated intraocular pressure. a clear corneal incision is made and viscoelastic material is injected into the anterior chamber over the lens to increase and maintain anterior chamber depth. the endoscope is inserted through the temporal incision to view the nasal ciliary processes, which is coagulated with the endpoint of shrinkage and whitening. the endoscope is moved in an arc, allowing treatment of the processes over an arc of 180° and a second corneal incision is made 90° away and 180° of ciliary processes are destroyed with laser therapy. the surgeon has completed coagulation of 270° of angle. the eye is reformed with balanced salt solution. wounds are checked for leakage and sutures are placed to seal the wound. what cpt® code is reported?
What are 5 Clever Way psychologists have for measuring implicit forms of prejudice?
What is the name given to the original finch that diverged in to 15 different species? A. Darwin's finch B. Radiant finch C. Ancestral finch D. First finch
List the three bacterial species in order of their increasing fastidiousness
In order of increasing fastidiousness, the list of bacterial species starts with Escherichia coli, followed by Staphylococcus aureus, and ends with Micrococcus luteus, with E. coli being the least demanding and M. luteus the most demanding in terms of growth requirements.
The term fastidiousness in biology refers to the level of nutritional and environmental specificity that bacteria require for growth. To list bacterial species in order of their increasing fastidiousness is to arrange them from the least demanding to the most demanding in terms of the growth conditions they require. Including the bacterial species provided in the question, we can list Escherichia coli (E. coli), Staphylococcus aureus (S. aureus), and Micrococcus luteus based on their typical fastidiousness.
Escherichia coli, a Gram-negative coliform species, is known for its ability to grow in a variety of environments with minimal nutritional requirements, which classifies it as the least fastidious of the three. In contrast, Staphylococcus aureus, a Gram-positive species, is moderately fastidious, requiring more specific nutrients and conditions than E. coli, but still capable of growing in many environments. Lastly, Micrococcus luteus is considered highly fastidious, requiring specific nutrients and conditions not necessary for the growth of the other two species, making it the most fastidious in this list.
Therefore, the bacterial species in order of increasing fastidiousness are:
Escherichia coliStaphylococcus aureusMicrococcus luteusPredict a potential outcome of a mutated MAD protein
MAD protein are mutants cells and they can be refers to as mitotic arrest deficient. MAD protein act by recruiting the anaphase inhibitor MAD2 to dissociate kinetochores and its essentials from MAD2-CDC20 complex formation in vivo.
However, there mutation will produce defective protein and checkpoint failure by resulting into aneuploidy. Aneuploidy is when a cell finishes the process of mitosis and produces daughter cells with few or too many chromosomes and aneuploidy causes more than 90% of human cancer.
The potential outcome of a mutated MAD protein is development of aneuploidy in daughter cell.
Further Explanation:
The cell cycle is referred as the prearranged flow of steps that include the cellular division as well as cell growth. This cycle form two new daughter cells. The cycle is begins with the interphase. In this phase, mainly the cell replicates and matures its DNA.
The second stage of a cell cycle is the mitosis or M phase. Mitosis is a kind of cell division. In this, parental cells divide into two daughter cells which have the same number of chromosomes as that of the parent cell
MAD protein is a kind of a protein that mainly present in humans and this protein is encoded by MXD1 gene. This protein is mutant cell that is referred as mitotic arrest deficient. This protein has a role in recruiting an inhibitor MAD-2 which is anaphase inhibiter help in dissociating the kinetochores.
Development of any Mutations in the MAD protein can develop a defective protein and malfunction of the checkpoints. The cell ends the cell cycle by the last stage which mitosis. In the presence of mutated MAD protein daughter cell cannot develop properly. Daughter cell can have very low or high number of chromosome and can result in aneuploidy condition. Mainly aneuploidy cell develop or result in cancer cell.
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Answer Details:
Grade: High School
Subject: Biology
Chapter: Cell Cycle
Keywords:
Cell cycle, parent cell, mitosis, aneuploidy, daughter cell, protein, MAD, mutated protein, encoded, human, checkpoints, cancer cell, daughter cell, chromosome.
These cancers represent the most common cancers in the United States.
1 lung, bone, prostate
2breast, pancreatic, stomach
3skin, breast, lung
4pancreatic, prostate, lung
Answer:
The correct answer is 3) skin, breast, and lung.
Explanation:
Being that they are the top 3 common cancers in the US and widespread across the world.
The cancers that represent the most common cancers in the United States is the breast, pancreatic, and stomach. Option B.
What is cancer?Generally, Cancer is simply defined as a disease in where certain cells in the body grow and spread to diverse parts of the body.
In conclusion, the most common cancers in the United States is the breast, pancreatic, and stomach as they represent most people having it.
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most of the insulin manufactured today to treat diabetes is produced by
What is the evolutionary value of mutations?
Mutations are crucial for evolution as they are the primary source of genetic variation. Although most mutations are neutral or harmful, some can be beneficial, leading to better adaptation and evolution. This genetic diversity allows for natural selection and the survival of the fittest.
Mutations are changes to an organism's DNA and are an important driver of diversity in populations. They serve as the ultimate source of genetic variation, which is crucial for evolution. Without them, evolution would not occur.
Most mutations are neutral or harmful, but a small percentage can have beneficial effects, leading to new versions of proteins that enable better adaptation to environmental changes. This genetic diversity allows some individuals to have a survival advantage, leading to natural selection and subsequently, evolution.
For instance, a gene might encode a product with an essential function as well as a potentially useful function for reproductive success. Mutations that enhance these additional functions will persist in the gene pool if they do not overly hinder the gene's primary function. This balance is essential for the flexibility of evolutionary mechanisms.
A particular gene can have 2 forms, called alleles.Which statement best describes the difference between the dominant allele and the recessive allele?
A) only the dominant allele is expressed when the both allele are inherited
B) only recessive allele is expressed when both allele are inherited
C) the recessive allele is expressed only if it moves to a different chromosome
D) the dominant allele can be expressed only if two homologous chromosomes have it
which material are you most likely to find in the O horizon
Undecomposed material
In the gene pool of a population with 350 individuals, a fixed allele has a frequency of
A fixed allele in a population is one where every individual carries the same version of a gene. This means its frequency is 100% in the gene pool, representing complete prevalence in the population's genetic diversity. The study of allele frequency and gene pools is vital in understanding evolution and genetic variation.
Explanation:The concept of a fixed allele refers to a situation in a genetic makeup where every individual in a population carries the same version (allele) of a gene. In population genetics, the allele frequency, or gene frequency, is the rate at which a specific allele appears within a population. Overall, it's a crucial concept in studying how populations evolve over time. For instance, if an allele provides a survival advantage, it can become more common throughout generations, eventually reaching a point where it's the only version present in the population (a fixed allele).
A gene pool, on the other hand, is the total number of genes of every individual in an interbreeding population. It represents the genetic diversity within a population. So, in a population of 350 individuals, if an allele is fixed, it means that the frequency of that allele is 1 or 100%, as every individual in that population carries that particular allele in their genetic makeup.
An understanding of allele frequency and gene pools is essential to study and understand the process of evolution and genetic variation within a population. Factors like mutation, gene flow, genetic drift, and natural selection all influence the frequency of an allele in a population.
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True or false plant cells derive their energy from chlorophyll
Which occurrence would contradict the big bang theory
What process do cells use to engulf larger substances, encase them in vesicles, and bring them into the cell?
which are structures of the excretory system? check all that apply. kidney, spleen, bladder, esophagus, ureter, urethra
The right answer is kidney, bladder, ureter, urethra.
The urinary tract is the device that allows the evacuation of catabolism products from the human body in a liquid form, the urine, and thus ensures the purification of blood and the maintenance of homeostasis within the body. organization. Also, it maintains the blood balance, the volume and the chemical composition of the blood. To do this it eliminates, among other things, the surpluses of certain minerals, called electrolytes, and returns to the blood the substances that are useful for the proper functioning of the organism (reabsorption).
Every day, a human being produces 800 to 2,000 milliliters of urine. The urinary tract is included in the excretory system (as the large intestine and the lungs).
This apparatus is a succession of retro- and subperitoneal organs: the two kidneys, the two ureters, the bladder and the urethra.
Answer:
Kidney, Bladder, Ureter, Urethra.
How have scientific advancements helped reduce the impact of hazardous events on society?
a. Scientific advancements have led to the ability to detect some hazardous events before they occur, allowing society to plan for them, mitigating their damage. b. Scientific advancements have led to the ability to prevent hazardous events. c. Scientific advancements have led to the ability to detect all hazardous events, preventing damage to society. d. Scientific advancements have not reduced the impact of hazardous events on society.
Answer:
A. Scientific advancements have led to the ability to detect some hazardous events before they occur, allowing society to plan for them, mitigating their damage.
Explanation:
Which is an energy conversion that occurs during cellular respiration?
At high noon, you're laying on the beach. You can feel _____ air coming from _____.
In multicellular organisms, specialized cells perform specialized functions. Which of the following cells is specialized for engulfing foreign material?