Answer:
German Zoologist discovers Theodor Schwann that animal were made from cell
The voltage-gated potassium channels close before the membrane potential is brought back to its resting level.
a. true
b. false
There are more negatively charged particles inside the membrane than outside, according to the resting membrane potential's negative value.
Explain about the voltage-gated potassium?Transmembrane channels called voltage-gated potassium channels (VGKC) are in charge of repolarizing the depolarized cell to its resting state following each nerve impulse. As a result, they play a crucial role in controlling neuronal excitability in the central nervous system and peripheral nervous system.
Based on both their ion-conducting capabilities and their interactions with other proteins in signaling complexes at the plasma membrane, voltage-gated potassium channels control the passage through cell cycle checkpoints. Throughout the cell cycle, the membrane potential fluctuates.
Potassium rushes out of the cell along its electrochemical gradient when a set of voltage-gated potassium channels open. The membrane potential is swiftly reduced by these occurrences, returning it to its regular resting condition.
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Which of the following statements about the effects of pollution on marine ecosystems is true?
A)
Burning fossil fuels causes a direct increase in the temperatures of ocean water.
B)
Burning fossil fuels causes an increase in the acidity of ocean water.
C)
Pollution in marine ecosystems causes a decrease in the formation of algal blooms.
D)
Addition of warm water has no effect on marine ecosystems.
Answer:
a Burning fossil fuels causes a direct increase in the temperatures of ocean water.
Explanation:
Answer: A
Explanation:
safety laboratory rules
Answer:
please mark me brainliest
Explanation:
Know locations of laboratory safety showers, eyewashstations, and fire extinguishers. ...
Know emergency exit routes.
Avoid skin and eye contact with all chemicals.
Minimize all chemical exposures.
No horseplay will be tolerated.
Assume that all chemicals of unknown toxicity are highly toxic.
Answer:
Rule #1 - WALK
Rule #2 - PROPER LAB ATTIRE
Rule #3 - HANDLING CHEMICALS
Rule #4 - HANDLING EQUIPMENT
Rule #5 - BROKEN GLASS
Rule #6 - EYE WASH/SHOWER
Rule #7 - FIRE SAFETY
Rule #8 - EATING/DRINKING IN LAB
Rule #9 - CLEANING UP
Rule #10 - HAND WASHING
Explanation:
what killed the dinosuars?
Answer:
An asteroid
Explanation:
Answer:
There are many theories but one I rely on is that the meteor crashed into the ocean and created a gigantic tsunami along with smoke that both killed the dinosaurs.
solve it according to the question please.
the subject is petroleum, so please solve it regardibg
this.
F- Explain the global carbon-climate cycle during the Cretaceous period. (Write only one paragraph describing what happened during the Cretaceous geological period in order to have good source rocks.)
During the Cretaceous period, high temperatures and abundant vegetation resulted in increased \(CO_2\) levels, leading to the accumulation of organic matter and the formation of good source rocks for oil and gas.
During the Cretaceous period, spanning from approximately 145 to 66 million years ago, the global carbon-climate cycle played a crucial role in the development of favorable conditions for the formation of good source rocks. The period was characterized by high global temperatures and abundant vegetation, resulting in increased carbon dioxide \((CO_2)\) levels in the atmosphere.
The elevated \(CO_2\) levels fueled vigorous photosynthesis, leading to the accumulation of organic matter in marine and terrestrial ecosystems. As this organic matter was buried and subjected to heat and pressure over millions of years, it transformed into oil and gas, creating potential source rocks. The warm climate and prolific vegetation during the Cretaceous, along with the subsequent geological processes, contributed to the formation of the rich hydrocarbon reserves that are vital to our energy resources today.
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The correct question is:
Explain the global carbon-climate cycle during the Cretaceous period. (Write only one paragraph describing what happened during the Cretaceous geological period in order to have good source rocks.)
The mineral graphite is used in pencils. What is the characteristic that allows it to be used for this purpose? *
1 black streak
2 hardness of 1-2
3 both are correct
With which of the following complement proteins does C-reactive protein interact?
Answer:
C-reactive protein (CRP) is an acute-phase serum protein and a mediator of innate immunity. CRP binds to microbial polysaccharides and to ligands exposed on damaged cells. Binding of CRP to these substrates activates the classical complement pathway leading to their uptake by phagocytic cells.
The initial element of the complement system, C1q, is especially involved in interactions between C-reactive protein (CRP) and the complement proteins of the classical route.
C-reactive protein (CRP) interacts with the classical route complement proteins, especially with C1q, the first element of the complement system. As a result of this contact, the classical pathway's cascade is activated, resulting in the creation of the C3 convertase and the subsequent cleavage of C3 into C3a and C3b. To label pathogens and injured tissues for opsonization and phagocytosis, C3b attaches to their surfaces. In addition, CRP boosts complement system activation by stabilising C3 convertase and encouraging the creation of the membrane assault complex, which causes lysis of the target cells. CRP thus contributes to the removal of infections and damaged tissues and is essential for the innate immune response.
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why is a chromosome smaller than dna
Answer:
A chromosome is not smaller than DNA
Explanation:
In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure.
Evaluate this statement. Is it correct? Pick the option that has the best argument for/against this claim
"Anaerobic respiration is only used when aerobic respiration is not an option."
Answer:
Explanation:
This statement is not entirely correct. While aerobic respiration is the most efficient way for cells to produce ATP (adenosine triphosphate), which is the energy currency of cells, anaerobic respiration can occur even when oxygen is available.
Anaerobic respiration, also known as fermentation, is less efficient and produces less ATP compared to aerobic respiration. However, it can occur in the absence of oxygen or in conditions where oxygen is not readily available, such as during high-intensity exercise when there is not enough oxygen to keep up with energy demand. Anaerobic respiration can also occur in certain microorganisms, such as some bacteria and yeast.
Therefore, a better statement would be "Anaerobic respiration is used when aerobic respiration cannot produce enough ATP to meet energy demand, or when oxygen is not available."
what is the function of photosystems
Answer:
Photosystems are the functional units for photosynthesis, defined by a particular pigment organization and association patterns, whose work is the absorption and transfer of light energy, which implies transfer of electrons. Physically, photosystems are found in the thylakoid membranes.
Explanation:
The main functions of a photosystem are: they are a functional unit of photosynthesis, and they trap or release light.
What is a photosystem?Plants, algae, and cyanobacteria all have thylakoid membranes that contain photosystems. These membranes are found in the cytoplasmic membrane of photosynthetic bacteria as well as the chloroplasts of plants, algae, and other vascular organisms. The PSI and PSII subtypes of photosystems exist.
The functional components of photosynthesis are called photosystem, and they are identified by specific pigment organization and association patterns.
Therefore, the photosystem is responsible for absorbing and transferring light energy, which entails transferring electrons. The thylakoid membranes contain photosystem in terms of physical location.
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3. Why is it easy to describe an organism's phenotype for a particular characteristic but
very difficult to state the genotype?
Answer:
The sum of an organism's observable characteristics is their phenotype. A key difference between phenotype and genotype is that, whilst genotype is inherited from an organism's parents, the phenotype is not. Whilst a phenotype is influenced the genotype, genotype does not equal phenotype
What are 3 solutions that would work better than the stamp act
The solutions that would work better than the stamp act are:
The Declaratory ActsThe Sugar Act The tea Act What was the solution to the Stamp Act?Benjamin Franklin petitioned the British House of Commons, and the Stamp Act was repealed by a vote of Parliament. However, the Declaratory Acts were approved by Parliament the same day, stating that the British government possessed unrestricted and complete legislative authority over the colonies.
The Stamp Act imposed a tax on products inside the colonies, whereas the Sugar Act solely applied to imports. Internal taxes had hitherto solely been the responsibility of colonial assemblies.
Therefore, one can say that the Tea Act was enacted by the British Parliament in 1773 in an effort to salvage the struggling business. The act gave the firm permission to commission agents who would have the exclusive right to sell tea in the colonies and to send its tea directly to the colonies without first landing it in England.
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NEED HELP ASAP!!!
In temperate regions, a lot of animals are active in daylight and inactive at night. This is_[blank 1]_ because daytime temperatures are warm, and animals can rely on their_[blank 2]_ to find food.
blank 1: a survival disadvantage
blank 2: sight
blank 1: a survival advantage
blank 2: sight
blank 1: a survival advantage
blank 2: hearing
blank 1: a survival disadvantage
blank 2: hearing
Answer:
Explanation:
blank 1: a survival advantage
blank 2: sight
In temperate regions, a lot of animals are active in daylight and inactive at night because daytime temperatures are warm, and animals can rely on their sight to find food. This is a survival advantage because being active during the day allows animals to take advantage of the warm temperatures and find food more easily.
The main function of the central nervous system
Answer:
The main function of the central nervous system is to control the functions of the body and the mind. It consists of the brain and spinal cord, which are one of the most essential parts of the human body. It has three main functions: sensory, integration, and motor.
Explanation:
middle which diagram shows the changes in appearance of a plant cell when a remains in a concentrated sugar solution for thirty minutes? what is th answer
The osmosis diagram is the one that most accurately represents how a plant cell might change in appearance after spending thirty minutes in a concentrated sugar solution.
Osmosis is the process by which water molecules move from an area with a lower concentration of solutes to an area with a higher concentration of solutes across a semi-permeable membrane.
If a concentrated sugar solution were present, the solute concentration outside the plant cell would be higher than that inside.
Water from inside the plant cell would naturally try to exit the cell as it is submerged in the concentrated sugar solution in an effort to balance the solute concentration on either side of the cell membrane.
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What is the difference between a species and a population?
Answer:
species is the type of organism population is the amount of said organism
Explanation:
how did the occurrence of the different traits change over the 30-year period? use evidence from the graph to support your answer. using what you know about natural selection and adaptation, what generalization can you make based on these changes?
Answer:
You didn't show the graph
Explanation:
Answer:
Darwin was a British naturalist UN agency planned the idea of biological evolution by survival of the fittest.
Explanation:
2 Siberian spruce trees do all of their growing during the summer, not during the winter. Suggest at least two explanations for this.
Because of the short days, extreme cold, and an abundance of snow in winter, trees are unable to complete all of their growth during this time. Growth is impossible during the winter since there is little to no water and little to no sunlight.
What adaptations do Siberian spruce trees have?The Pecia ovobata's conical form encourages snow to shed and reduces branch damage. The needles' narrowness reduces the surface area through which water could escape. They also have a thick, waterproof waxy coating. The needles are shielded from drying winds as a result.
Spruce commonly withers in hot, humid conditions despite being a native of cool, dry regions. Pick a planting location with full sun exposure, rich, wet soil, and good drainage. Once planted, spruce is tolerant of brief droughts. The short version is that evergreens don't have to be green all the time, but it's perfectly normal for them to lose leaves in the winter and early spring. Check that newly planted trees and shrubs have received the recommended upkeep if they appear ill after spring or in the middle of summer.
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Cyanobacteria were the first organisms to photosynthesize but
they died out before the end of the Precambrian.
True or false
Answer:
true
Explanation:
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Answer:
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Would this statement be accurate? Organisms and their habitats are in danger of destruction, since plastic is a non-renewable, non-biodegradable material that is easy to manufacture but hard to convert to environment friendly substances.
As plastic is made from crude oil, the end product of million of years, a non renewable resource, it really is non renewable. But it still can be recycled. Most plastics are no biodegradable because there are no organisms (such as bacteria and fungi) that could break that material. It can be easy to be manufactured, even if it's production costs lots of other material extracted from nature, but humanity is still looking for the best ways to convert it into environment friendly substances. Therefore, yes the statement is accurate.
a fossilized cell is discovered and evidence suggest it reproduced on its own and had dna but a membrane did not enclose its dna which type of organism would this most likely be
a fossilized cell is discovered and evidence suggest it reproduced on its own and had dna but a membrane did not enclose its dna. this is more likely a prokaryotes.
What are prokaryotes?Prokaryotes are creatures without a nucleus or other organelles in their cells. Bacteria and archaea, two separate groupings of prokaryotes with allegedly independent evolutionary histories, are separated into.
The majority of prokaryotes are tiny, single-celled creatures with a straightforward structure. Prokaryotic cells lack intrinsic membrane-bound organelles in their cytoplasm, while being surrounded by a plasma membrane. Prokaryotes differ from eukaryotes, another type of creatures, in that they lack a nucleus and other membrane-bound organelles.
One circular DNA molecule, or chromosome, makes up the majority of the genetic material carried by prokaryotes. Prokaryotes have a nucleoid in the centre of the cell that houses the DNA but is not protected by a nuclear membrane. In addition to chromosomal DNA, many prokaryotes also possess smaller, circular DNA molecules known as plasmids, which can provide genetic benefits in particular situations.
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Which is not an adaptation of desert animals that help them retain and acquire water in such a hot and dry environment?
a.
burrow in moist soil or live in underground dens
b.
excrete uric acid instead of urine
c.
evolved an internal ‘air conditioning’ system to help them stay cool
d.
obtain water from the plants and animals they eat
An adaptation of desert animals that helps them retain and acquire water in such a hot and dry environment is to evolve an internal air conditioning system to help them stay cool. Thus, the correct option is C.
What is Adaptation?Adaptation may be defined as the methodology that involves numerous changes through which an organism or species becomes better compatible with its surrounding environment.
Adaptation also characterizes the specific property of organisms through which they acquired certain changes slightly over time to be able to continue to exist in a particular environment.
Statement three "evolved an internal air conditioning system to help them stay cool" represents the process of evolution rather than adaptation.
While excretion of uric acid in place of urine, obtaining water from the plants and animals, and burrowing in moist soil or living in underground dens demonstrate the process of adaptation.
Therefore the correct option for this question is C.
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Which of the following describes an effect of particulate matter on health?
Fine particles are less dangerous, as they mainly affect nasal passages.
Coarse particles are associated with aggravated asthma.
Coarse particles are more dangerous, as they infiltrate deep into the lungs.
Fine particles are associated with decreased lung function.
Answer:Particle pollution and health risks, including premature death. Health effects may include cardiovascular effects such as cardiac arrhythmia´s and heart attacks, and respiratory effects such as asthma attacks and bronchitis.
Explanation:
a macrophage ingests the equivalent of 100% of its plasma membrane each half hour by endocytosis. what is the rate at which membrane is returned by exocytosis? discuss what would happen at rates above and below you assumed correct rate.
The rate at which membrane is returned by exocytosis as since the surface area and volume of a macrophage does not appreciably change during this period, the rate of exocytosis also needs to be 100% of the plasma membrane every half hour.
According to our research, the endocytosis rate may be increased even to interphase levels by adding amphiphilic chemicals to metaphase cells. All detergents and solvents accelerated endocytosis, and the degree of this accelerated endocytosis increased directly with the addition of concentration. This would happen above and below the assumed correct rate. For the purpose of ingesting nutrients from the environment, a cell creates tiny vesicles or bags through the process of endocytosis.
A cell's plasma membrane area must remain constant in order for it to keep its size and shape. The process of exocytosis, which is the opposite of endocytosis, increases the plasma membrane area.
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When reactive oxygen species build up in a cell, they tend to bind avidly to different sites in the cell. Which site is most strongly linked with the onset of chronic inflammation?
Cell membrane
Nuclear DNA
Ribosomes
Mitochondrial membrane
The site that is most strongly linked with the onset of chronic inflammation when reactive oxygen species build up in a cell is the cell membrane.
The site that is most strongly linked with the onset of chronic inflammation when reactive oxygen species build up in a cell is the cell membrane. Reactive oxygen species, also known as free radicals, are highly reactive molecules that can cause damage to different components of a cell. When they accumulate in excess, they can bind avidly to the cell membrane, leading to oxidative stress and inflammation. This can result in the activation of immune cells and the release of inflammatory mediators, such as cytokines and chemokines. Over time, chronic inflammation can contribute to the development of various diseases, including cancer, cardiovascular disease, and neurodegenerative disorders. Therefore, it is important to maintain a balance between the production and scavenging of reactive oxygen species to prevent oxidative stress and chronic inflammation.
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A drug-resistant bacteria, virus, fungus, or parasite?
Explanation:
Antimicrobial resistance (AMR),develops when microbes, including bacteria, fungi, parasites, and viruses, no longer respond to a drug that previously treated them effectively.
What global circulation cell most strongly affects the weather
and climate and Vancouver, British Columbia?
Select one:
a. Ferrel cell
b. Polar cell
c. Trade winds
d. Polar high
e. Hadley cell
Which of these human activities is most likely to cause the excessive growth of phytoplankton
in the world's oceans?
F The use of chemical fertilizers that are carried by runoff into rivers
G The logging of old-growth forests, which results in erosion
A The spraying of chemical herbicides that reduce carbon dioxide in the air
J
The mining of fossil fuels, which requires digging underground tunnels
Answer:
F
Explanation:
Chemical fertilizers usually contain nutrients that phytoplankton require to grow
Answer:
F
Explanation:
Tttttcy
3. A family rented a pontoon and cruised across the lake at 15 mph for 1.85 hours. How many
miles did the family travel?
Answer:
27.75 Miles
Explanation:
15 * 1.85 = 27.75