Enzymes in saliva begin the chemical digestion of _________. fats carbohydrates protein. vitamins
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The _______________ are a group of fish thought to be ancestral to amphibians. cartilaginous fish crossopterygians ray-finned fish african lungfish
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Hydroxide is not a suitable base for deprotonation of acetylene:
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This is because the acetylide ion is a stronger base than the hydroxide ion, therefore, the equilibrium will not favor the production of acetylide ion over hydroxide ion.
Hydroxide is not a suitable base to deprotonate acetylene because acetylene is a weak acid with a high pKa, and OH− is not strong enough to shift the equilibrium towards the deprotonated species. Stronger bases like NH2− are required for effective deprotonation.
The student's question revolves around why hydroxide (OH−) is not an appropriate base for the deprotonation of acetylene (HC=CH). In chemical terms, acetylene possesses acidic protons but is still a relatively weak acid, with a pKa value of about 25. While hydroxide is generally recognized as a strong base, it is not sufficiently strong to deprotonate acetylene effectively. The equilibrium of the reaction between hydroxide and acetylene lies significantly to the left, indicating that the reaction does not favor the formation of the deprotonated product. Stronger bases, such as amides (NH2−), are necessary to successfully remove a proton from acetylene.
Furthermore, comparing the acidities of different molecules, it has been observed that in aqueous solution, the acidity of alkynes is not well-characterized but is presumed to be around 1010 times less acidic than water. However, in the gas phase, ethyne (another name for acetylene) behaves as a stronger acid than water. This exemplifies how the environment can influence acid-base behavior.
A flap of tissue that closes over the larynx during swallowing to prevent material from entering the lungs is called:
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Answer:
Epiglottis
Explanation:
Which of the following lists the steps of blood clotting in the proper order?
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Vessel spasm; plug formation; coagulation. Option C is correct.
Vessel spasm: To reduce blood flow and loss at the site of injury, blood vessels contract.
Formation of the plug: Platelets attach themselves to the broken vessel wall and combine to create a temporary plug.
Coagulation: A series of intricate protein processes known as the "coagulation cascade" lead to the synthesis of fibrin strands, which solidify the platelet plug and create a stable clot.
Therefore, Vessel spasm; plug formation; coagulation.
The complete option are :
Which of the following lists the steps of blood clotting in the proper order?(2 points)
Vessel spasm; plug formation; coagulation
Coagulation; plug formation; vessel spasm
Coagulation; vessel spasm; plug formation
Vessel spasm; coagulation; plug formation;
Approximately how much water is reabsorbed into the blood after filtration out of the blood in the renal corpuscles of the kidneys
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The percentage of water reabsorbed into the blood after filtration out of the blood in the renal corpuscles of the kidney is 99%. In tubular reabsorption, the percentage of 1% of the glomerular filtrate actually leaves because the 99% is reabsorbed into the blood when it passes in the renal tubules and ducts. This process is tubular reabsorption and occurs in three mechanisms which are osmosis, diffusion and active transport. The body’s needs are the basis why reabsorption varies as per individual. This enables the body to retain most of its nutrients. This happens when solutes and water are removed from the tubular fluid and transported into the blood.
What type of policy would only provide coverage for specific types of illnesses (cancer, stroke, etc)? mewa blanket insurance dread disease insurance disability insurance?
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There are many insurance companies who provide protection for money from loss by offering different type of insurance policies. There are many categories of insurance like life insurance, health insurance, vehicle insurance etc
Each category have further types of plans of insurance.
Dread Disease Insurance is a type of policy that provides coverage specifically for certain serious illnesses like cancer or stroke. It is a form of direct-purchase insurance bought directly from a private company.
Explanation:The type of policy that only provides coverage for specific types of illnesses, such as cancer or stroke, is known as Dread Disease Insurance. This kind of insurance is designed to help offset the costs associated with a particular type of serious illness. It is not the same as health insurance that pays when you receive medical care, car insurance that pays if your car is in an accident, house or renter's insurance that pays for stolen possessions or items damaged by fire, or life insurance, which pays for the family if the insured individual dies. Those are examples of other types of insurance markets. Instead, dread disease insurance is a type of direct-purchase insurance that one buys directly from a private company.
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Although bacterial toxins vary in their activity and effects on host cells, a small amount of gram-negative bacteria endotoxin:
a. inactivates key cellular functions
b. is released during cell growth
c. in the cell wall activates inflammation
d. uses protein to activate enzymes
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Which statement about this diagram is correct?
A. Molecule 2 is DNA, which can be bond with another DNA molecule
B.Molecule 1 is RNA, which contains thymine
C.Molecule 1 in DNA which if a double helix
D.Molecule 2 in RNA and it is the only nucleic acid that contains four types of bases
Which statement explain the overall function of the two molecules in the diagram?
A.They make up an organism's physical structure.
B.They carry information about how an organism is put together and maintained.
C.They provide an organism with usable energy in the form of ATP.
D.They store excess carbohydrates for later use.
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The information in a gene that directs the production of a cellular product is gene expression. the correct sequence for the transfer of information from a gene to a function protein is __________.
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Which of the following correctly describes animals?
A. Eukaryotic autotroph
B. Prokaryotic autotroph
C. Eukaryotic heterotroph
D. Prokaryotic heterotroph
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Which of the following does not contain noncoding DNA? A. Exons, B. Introns, C. Telomere, or D. Transposons
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Why do viruses need living hosts, such as bacteria or eukaryote cells?
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please vote my answer brainliest. thanks!
how might protists ability to move relate to its method of obtaining food?
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Answer:
Some protists produce their own food through photosynthesis, while others consume particles of organic substances, viruses and bacteria.
Explanation:
After the devastating tsunami in Japan in 2011, the nuclear power plant failed and released radioactive material into the ocean. Which long-term impacts would radioactive material most likely have on fish populations?
Exposure to radiation would result in a large fish kill, decrease reproduction rates for fish, and decrease the amount of fish caught by the industry.
Exposure to radiation would result in a large fish kill, which would increase reproduction rates for fish and not impact the amount of fish caught by the industry.
Exposure to radiation would result in a small fish kill, which would decrease reproduction rates for fish but increase the amount of fish caught by the industry and the food supply for the general population.
Exposure to radiation would only result in water pollution, which would impact reproduction rates for fish and would increase the amount of fish caught by the industry.
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Answer: Exposure to radiation would result in a large fish kill, decrease reproduction rates for fish, and decrease the amount of fish caught by the industry.
Explanation:
The radiation can be define as the transmission of energy in the form of waves or beam of particles that requires a material medium to travel. The radiations can cause instant mutations in living beings and they can also be lethal.
The radiations emitted by the radioactive material in a nuclear power plant may penetrate the oceanic water, where these will influence the living creatures in water. This will lead to the death of fishes as these are powerful and can cause huge damage. Thus the reproductive rate of fish will decrease as a result of this the fishes will not be available for commercial selling by the industry.
Vitamin d deficiency can result in poorly mineralized bone. the resulting disease is called ____________.
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What type of bond does water form? A. Ionic bonds B. Covalent bonds C. Polar bonds D. Hydrogen bonds
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A tadpole will lose its tail as it grows into an adult. Which cell structures in the tail of a tadpole cause this change to occur?
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Answer:
The cells were programmed to die.
Explanation:
Trus me
Please tell me if I'm wrong (I'm not), and maybe consider brainliest.
All the organ systems in the human body work together to perform which function
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How should the hands of a caregiver be placed during an attempt to facilitate a muscle contraction?
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One of the exteroceptive stimulation techniques is MANUAL CONTACTS.
Under this technique, the hands will exert firm and deep pressure on the contact of the body where the muscle is located. This activates the tactile or touch receptors and muscle proprioceptors. This also facilitates muscle contractions; muscles that are directly under the hands and provides support and security to unstable body parts or segments.
What happens as a river gets older?
A. Its stream gradient increases.
B. Its floodplain widens.
C. Its water flows faster.
D. Its suspended load contains bigger rocks.
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Answer: B. Its floodplain widens
As, the river gets older it accumulates larger number of water sources called as tributaries. Therefore, the volume of water will increase. Also, the soil near the water body is taken away by water flowing in a faster current due to soil erosion by water. This soil gets settled at the bottom increasing the channel of river flow. As, the river gets older the bottom bed becomes wider hence, will result in increased in water channel. Therefore, floodplains are wider in rivers getting older.
Answer:
its floodplain widens
Explanation:
New major food crops developed in recent times are:
few
many
some
none
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As a result of its involvement in a reaction, an enzyme __________________.
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As a result of its involvement in a reaction, an enzyme remains unchanged and unaltered.
As a result of its involvement in a reaction, an enzyme remains unchanged and unaltered. Enzymes are biological catalysts that speed up chemical reactions by reducing the activation energy required for the reaction to occur. Enzymes facilitate the conversion of substrates into products without themselves undergoing any permanent changes. They do not get consumed or depleted during the reaction.
Enzymes achieve this by binding to substrates, stabilizing the transition state, and facilitating the formation or breaking of chemical bonds. After the reaction, enzymes are released and available for further catalytic cycles, making them highly efficient and crucial components of metabolic pathways, ensuring the proper functioning of various biochemical processes in cells.
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What genotype do offspring of the cross between a homozygous dominant with a homozygous recessive have?
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_______ is the type of vision useful in sensing motion and objects outside normal vision.
a.focal vision
b.central vision
c.peripheral vision
d.blind spots
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This vision occurs outside the center of gaze. We use peripheral vision everyday but we don't know how it works. peripheral vision is divided in three ways: Near peripheral vision, mid peripheral vision and far peripheral vision.
which of the following is a primary product?
A. a producer, like algae
B. a carnivore, like a lion
C. an omnivore, like a human
D. a detritivore, like an earthworm
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Describe example of poaching that is prevalent in our area
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For example in India, this has severely affected the survival-probability of tigers. There were 20000 Tigers in India in the 20th century, and now there are only 3000. This shows the severity of the problem. The government is now taking serious steps against the poachers.
How do webbed feet help ducks survive? Webbed feet help ducks maintain homeostasis. Webbed feet help ducks move efficiently through water. Ducks are birds, and many birds have webbed feet. Webbed feet help ducks keep their balance on land.
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Webbed feet in ducks are specialized features that help them move efficiently through water, aiding in swimming and floating. This adaptation allows ducks to easily find food, evade predators, and migrate. The primary function of webbed feet is to facilitate movement in aquatic environments.
Explanation:Webbed feet are a specialized adaptation that help ducks move efficiently through water. The webbing between their toes allows them to paddle and navigate in water, acting almost like a boat's oar. This efficiently propels them forward, making them excellent swimmers. Ducks spend a significant portion of their lives in aquatic environments, where having webbed feet offers a considerable survival advantage. It enables them to easily pursue prey, escape predators, and move swiftly to different locations in search of food or during migration.
Besides aiding in swimming, webbed feet also support ducks floating on water surfaces. This feature, combined with their ability to fly, provides a significant advantage in avoiding terrestrial predators. Therefore, webbed feet are critical for ducks' survival, directly affecting their ability to find food, avoid danger, and ultimately reproduce. However, it's important to note that while webbed feet assist in aquatic environments, they are not primarily for keeping balance on land or maintaining homeostasis; their main function is to aid in movement through water.
which polymer is responsible for inharetence
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The polymer responsible for inheritance is DNA in cells. It transmits genetic information from one generation to another. The functionality of different polymerases, including RNA polymerase, can be observed in experiments involving α-amanitin, a mushroom-produced toxin.
Explanation:The polymer responsible for inheritance is known as DNA (DeoxyriboNucleic Acid). DNA, which is located in the cell nucleus, is responsible for the transmission of genetic information from one generation to the next. It consists of two twisted strands forming a double helix. Each strand is a polymer composed of repeating units called nucleotides.
The transfer of genetic information involves specific polymerases including RNA polymerase. A demonstration of this process can be witnessed in gene expression experiments involving α-amanitin, an oligopeptide toxin produced by certain mushrooms. Intriguingly, the α-amanitin impacts different polymerases in various ways. For example, RNA polymerase I is completely affected by it.
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You notice that after you sprained your ankle that the ankle become swollen, red, and hot. why did the ankle get hot?
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After a sprain, the ankle gets hot due to inflammation caused by increased blood flow to the affected area.
Explanation:The ankle gets hot after a sprain due to the process of inflammation. When there is an injury, such as a sprained ankle, histamine is released, causing increased blood supply to the affected area. This increased blood flow leads to redness, swelling, and heat. The heat is a result of the increased metabolism and activity of immune cells in the area.
Rest and Elevation:
Resting the injured area and elevating it above the level of the heart can help reduce inflammation by promoting proper fluid drainage.
Cold Compress:
Applying a cold compress or ice pack can also be effective in reducing inflammation and providing relief. This constricts blood vessels, which can help minimize swelling.
Medical Evaluation:
While initial care can be administered at home, it's important to seek professional medical attention for a thorough assessment, especially if the pain, swelling, or other symptoms persist or worsen.
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What subdivision of the autonomic nervous system would be most associated with the phrase âfight or flightâ?
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On the other hand, its antithetical system, the Parasympathetic subdivision of the ANS is known as the "rest and digest" division. It controls the day-to-day "normal" functions of the body when we are not aroused, alarmed, or in a state of vigor such as exercise. For example, it keeps us breathing at a steady rate between 8-16 breaths per minute, keeps our heartrate between 60-90 beats per minute, keep blood flowing to our digestive organs and kidneys to process nutrients and filter out wastes, respectively. Hence the term "rest and digest."
Final answer:
The subdivision of the autonomic nervous system associated with the "fight or flight" response is the sympathetic division.
Explanation:
The subdivision of the autonomic nervous system most associated with the "fight or flight" response is the sympathetic division. When faced with a threatening or stressful situation, the sympathetic division prepares the body for action by increasing heart rate, dilating the pupils, and initiating the release of adrenaline. These physiological changes enable the body to respond quickly and effectively to potential danger.