Answer:
By the late 1830s, botanist Matthias Schleiden and zoologist Theodor Schwann were studying tissues and proposed the unified cell theory. The unified cell theory states that: all living things are composed of one or more cells; the cell is the basic unit of life; and new cells arise from existing cells
Robert Hooke: (1663-1665)- The cell was discovered by Robert Hooke in 1665. He examined very thin slices of cork and saw many tiny pores. However, Hooke did not know their real structure or function.
Anton Van Leeuwenhoek: (1674-1683)- Leeuwenhoek made a microscope of glasses used by drapers by polishing tiny lenses of great curvature which gave magnifications up to 270× diameters, the finest known at that time.Leeuwenhoek was the first to see and describe bacteria(1674), yeast plants, the life present in a drop of water, etc.
Theodor Schwann(German zoologist):(1837-1839)- Matthias Schleiden found that all plants are composed of cells, and shared the finding with Schwann, who had found similar structures in the cells. Other researchers confirmed the similarity, after which he concluded, "All living things are composed of cells and cell products". This became the cell theory.
Matthias Schleiden(German botanist):(1839)- He stated that different parts of the plant organism are composed of cells. He also recognized the importance of the cell nucleus and told about its connection with cell division.
Rudolf Virchow:(1855)- Rudolf Virchow suggested that all cells come from pre-existing cells. His aphorism 'Omnis cellula e cellula' means every cell originates from pre-existing cell became the foundation of division, even if the process was not fully understood then.
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in epithelial tissues group of answer choices cells obtain nutrients via blood vessels found in the tissues the organelles and other cytoplasmic components are evenly distributed between the exposed and attached surfaces of the epithelial cells extracellular fluid or fibers separate the individual cells
In epithelial tissues there is little or no intercellular space between the cells.
The correct option is D.
What is epithelial tissue and its function?There are many epithelial tissues in the human body. They make up the majority of the tissue in glands, line body cavities and hollow organs, and cover all of the body's surfaces. Protection, secretion, absorption, excretion, filtration, diffusion, and sensory reception are just a few of the many tasks they carry out.
Why is epithelial tissue so important?The body's fundamental tissue barriers are the epithelia; they divide tissue into compartments, allow for the exchange of nutrients and waste products, and shield the body from the outside environment.
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The complete question is-
In epithelial tissues ________.
A) cells that are damaged or lost at the surface cannot be replaced
B) cells obtain nutrients via blood vessels found in the tissues
C) extracellular fluid or fibers separate the individual cells
D) there is little or no intercellular space between the cells
E) the organelles and other cytoplasmic components are evenly distributed between the exposed
List the energy saving adaptations that help aquatic amphibians manage the challenges of living in a dilute environment as efficiently as possible.
The majority of aquatic amphibians have a short Loop of Henle, which lessens mineral and water absorption. Water thus enters the kidney tubules directly.
Ammonia a safe waste product for amphibians :Ammonia is simple to excrete because it is small and easily diffuses through cell membranes. In essence, there is a trade-off between easy excretion and levels of toxicity. Due to the abundance of water available to diluted ammonia wastes, toxicity is minimal for aquatic animals.
How amphibians release their waste product ?The two kidneys in amphibians, like those in humans, filter waste from the bloodstream and combine it with water to form urine. The ureters transport urine from the kidneys to the bladder before it leaves the body through the cloaca.
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what is not the function of a nuclues
Answer:
To provide shape and rigidity to the cells.
OR
To transfer traits from parents to offspring in the form of genes.
Explanation:
Which sentence best describes the production of the energy carried NADPH by the light reactions?
Photons of light are absorbed by electrons in NADPH, increasing its energy.
Why are photons of light are absorbed by electrons in NADPH?Although it operates similarly, photosynthesis requires the distinct fuel NADPH. A high-energy electron and proton are taken up by the low-energy form NADP+ and transformed into NADPH. NADPH changes back to NADP+ when one electron is lost. Overall, this process transforms light energy into chemical energy in the form of ATP and NADPH.
The Calvin cycle, the following stage of photosynthesis, uses ATP and NADPH from the light-dependent process to produce carbohydrates. Two electron transport chains work together to make ATP and NADPH. During the photoreaction, oxygen and water are both consumed. Since the process starts with sunlight, these reactions can only occur in the sun. the moment the photosystem is reached by an electron from the electron transport chain.
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What is the name of naturally occurring salt, NaCI? A Halite B Sulfur C Graphite D Gypsum
The name of the naturally occurring salt Na CI is Halite.
What is Na Cl?
One of the most prevalent minerals on Earth is sodium chloride (NaCl), more generally known as salt. Many animals and plants require salt as nutrition. Seawater and subterranean rock formations both naturally contain sodium chloride.
Salts are ionic substances in chemical language. Most people understand salt to be the sodium chloride compound found in table salt. Ionic bonds between sodium ions and chloride ions produce sodium chloride. NaCl is the chemical formula because there is one sodium cation (Na+) for every chloride anion (Cl-). Every cell in our body depends on salt and, more specifically, the sodium ions (Na+) that are part of the salt's NaCl structure. Sodium and potassium-containing compounds are electrolytes, which are chemicals that dissolve in water and release ions.
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Plants and animals are part of all of the nutrient cycles through the foods they eat and what eats them. name four classes of organic compounds contain carbon and explain how the carbon cycle and nitrogen cycle contribute to the usable supplies of the macromolecules.
Four classes of organic compounds containing carbon are carbohydrates, proteins, lipids, and nucleic acids. The carbon cycle involves photosynthesis which gives proteins to plants and animals. plants get their carbon from the air and their nitrogen from the soil.
Every living thing contains organic molecules like lipids, proteins, carbohydrates, and nucleic acids. Large carbon-based structures make up these macromolecules.
Living things use carbohydrates as a significant source of energy. Glucose, fructose, sucrose, galactose, ribose, deoxyribose, cellulose, and chitin are a few examples of carbohydrates.Lipids (Fats) Lipids are molecules that store a lot of energy. In comparison to carbohydrates, lipids store twice as much energy per gram.Amino acids are what make up proteins. The primary building elements of organisms are proteins. Large, intricate molecules called proteins are the building blocks of many different biological elements, including muscle fibers, enzymes, and hemoglobin.RNA and DNA are nucleic acids. The genetic code for producing proteins, specifically, is carried by DNA.Carbon is shared between living things and their environment during the carbon cycle. It describes how carbon moves when it is recycled and used again. Since carbon is the primary component of biological compounds, it is crucial for photosynthetic organisms to absorb carbon dioxide (CO₂) from the atmosphere, use it to make organic molecules like carbohydrates, lipids, proteins, and nucleic acids, and then release it back into the atmosphere as CO₂ during respiration.
On the other hand, plants cannot absorb nitrogen from the atmosphere in the form of the gas N₂. It is transformed by bacteria into ammonia (NH₃), a type of nitrogen that plants may use, as part of the nitrogen fixation process. Animals ingest useable nitrogen molecules when they consume plants.
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What are your own ways on protecting our environment?
What are the causes of soil erosion?
How can we protect our environment?
What should we do to increase the awareness about environmental population?
What are the solutions to our environmental problems?
please answer it...
Answer:
1.Reduce, reuse, and recycle. Cut down on what you throw away. ...
Volunteer. Volunteer for cleanups in your community. ...
Educate. ...
Conserve water. ...
Choose sustainable. ...
Shop wisely. ...
Use long-lasting light bulbs. ...
Plant a tree.
How do you know the strand below is
RNA and not a strand of DNA?
AGUCAAGGCACUGGAG
A. There is no way to distinguish the two strands.
B. The strand is too short to be DNA.
C. RNA contains uracil and DNA does not.
Answer:
C
Explanation:
because there is uracil instead of thymine. thymine is found in dna and uracil is found in rna
Why do some plants remove water from their cells to reduce the amount of water that freezes inside them during winter?
a. The frozen water constricts organelles and causes plant cells to shrink.
b. As water contracts during freezing, the cells pull away from each other causing damage.
c. Less water in the cells means the cells are smaller and need to do less work.
d. The expansion of water as it turns to ice inside the cells would break the cells apart.
Answer:
b. As water contract during freezing the cells pull away from each other causing damage
[tex]\Large \boxed{\sf D}[/tex]
The cells would split apart due to the expansion of extra water when it freezes inside them. The liquid inside the cells can freeze and expand when the temperature drops below 0°C. The crop becomes unproductive as a result of the cells breaking.
Technology has advanced to be able to create artifical body parts (vital organs, blood, etc). At what point do we stop being human and are considered machine?
Answer:
The point at which you are no longer human is subjective to yourself.
Explanation:
If you replace the broken parts of a ship over decades and decades as it slowly breaks down, you don't ever have a completely different ship, even after all the parts have been replaced. Fixing something thats broken doesn't detract from what it was originally.
answer picture attached
Answer:
I think its c or d
Explanation:
What is the function of carbon dioxide in the atmosphere?
Answer:
To warm up the Earth.
Explanation:
Carbon dioxide in the atmosphere warms the planet causing climate change.
in the green alga chlamydomonas spp. the zygote divides only by meiosis, never by mitosis. haploid cells undergo mitotic divisions. this is an example of
The division of Chlamydomonas cell by meiosis and mitosis is an example of sexual and Asexual reproduction respectively
Chlamydomonas is a genus of green algae that are mostly found in ponds, freshwater lakes etc.
THEY used to be claasifeied as a protist but are generall regarded as plants
Chlamydomonas undergo both asexual, which can occur at any time and sexual reproduction that can only occur in favorable conditions
They reproduce asexually by a process known as mitosis is the division of one cell into daughter cells. each cell is genetically identical
During sexual reproduction, a single cell divides to produce four daughter cells through a process known as meiosis
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Helppppp this is due in 56 minutes
The image depicts erosion, specifically soil erosion. Soil erosion is the gradual deterioration of soil caused by the impact of water or wind on soil particles.
What are the consequences of soil erosion?Soil erosion refers to the denudation of the upper layer of soil. It is a form of soil degradation. This natural process is caused by the dynamic activity of erosive agents such as water, ice (glaciers), snow, air (wind), plants, and animals.Subsoil exposure, which frequently has poor physical and chemical properties. Higher runoff rates, shedding water and nutrients that would otherwise be used for crop growth crop failure in newly planted crops.Low-lying areas have silt deposits.Ways to prevent soil erosion :
Change your tillage practices. Soil tillage (digging, stirring, and overturning) is one of the most common methods of preparing land for crop cultivation.Keep an eye out for overgrazing.Think about terracing steep slopes.Create a buffer strip.To learn more about soil erosion refer to :
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When u sit an egg in water where does the water go and why
What is the major function of the endomembrane system? question 2 options: producing and storing energy manufacturing proteins directing the cell's activities transporting substances in a cell
The major function of the endomembrane system is transporting substances in a cell .
Endomembrane system in eukaryotic cells refers to the collection of membranes found inside the cytoplasm that work as a unified developmental and functional unit.
With the aid of vesicle transport, the membranes are either directly or indirectly coupled and exchange material.
This system's primary job is to transport, pack, and alter proteins and lipids into and out of the cell.
The Golgi apparatus, lysosomes, nuclear membrane, endoplasmic reticulum, and vesicles are the principal organelles that make up the endomembrane system.
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9. Is oxygen necessary for the production of ATP in your
cells? Why or why not?
Answer:
ATP production depends upon respiration
oxygen requirement depends on the type of respiration (aerobic or anaerobic) the cell does.
Explanation:
for anaerobic --->no oxygen is required e.g.red blood cells do not respire aerobically, only glycolysis produces ATP are utilized
for aerobic ----->oxygen is required.e.gliver cell
A student made a model of the earth and its atmosphere by covering a box
with plastic wrap and placing thermometers inside and outside of the box.
The temperature inside the box increased at a faster rate than the outside
temperature. This model best represents
This model best represents the role of carbon dioxide in trapping heat from radiation in the green house effect.
What is the green house effect?
By means of "greenhouse gases," heat is held in close proximity to the Earth's surface, creating the greenhouse effect. The world is kept warmer than it would be without the help of these heat-trapping gases, which act as a blanket surrounding the planet.
Most of the sun's visible light can travel through the atmosphere and reach the surface of the Earth. When sunlight heats the Earth's surface, some of the energy is radiated back into space as infrared radiation. Contrary to visible light, this radiation has a tendency to be absorbed by the greenhouse gases in the atmosphere, increasing its temperature. Infrared radiation is sent back toward the surface of the Earth by the heated atmosphere. (Despite its name, the greenhouse effect is not the same as the warming in a greenhouse, where glass panes transmit visible sunlight but hold heat inside the building by trapping warmed air.)
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Algal blooms, and the rapid proliferation of photosynthetic plankton can ultimately end up depleting all the oxygen from a body of water.
Please select the best answer from the choices provided
T
F
It is true that algal blooms, and the rapid proliferation of photosynthetic plankton can ultimately end up depleting all the oxygen from a body of water.
What is algal bloom?Algal bloom is the dense spread of algae on the surface of water. Algal bloom is caused by a process called eutrophication.
Eutrophication is the ecosystem's response to the addition of artificial or natural nutrients, mainly phosphates, through detergents, fertilizers, or sewage, to an aquatic system.
The proliferation of algal species will result in the increase in the number of decomposers such as bacteria when the algae die. This decomposers will make use of oxygen excessively causing a decline.
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Answer: its TRUE
Explanation: I got a 100% on the test
What can you do to take CO2 from the atmosphere?
Answer:
The first is by enhancing carbon storage in natural ecosystems, such as planting more forests or storing more carbon in soil.
Explanation:
On average day the trillions of cell in human body perform many chemical processes. which form of energy do those processes use directly?
sunlight
ATP
glucose
glycogen
Since on average day the trillions of cell in human body carry out many chemical processes. The form of energy do those processes use directly is option B: ATP.
How does your body get energy from ATP?By adding a phosphate group to another molecule, ATP can drive biological operations (a process called phosphorylation). Special enzymes are responsible for carrying out this transfer, which connects the cellular processes that need energy to the release of energy from ATP.
Note that since ATP is produced in the human body, the majority of ATP synthesis takes place during cellular respiration within the mitochondrial matrix, producing about 32 ATP molecules for each oxidized glucose molecule.
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Which event results in a change in the number of chromosomes in a cell?
A. crossing over
B. deletion
C. insertion
D. nondisjunction
In a culture of bacteria, there are some individuals that are unable to synthesize histidine. What is the best and most likely description of how these individuals differ from the other bacteria in the culture?.
In a culture of bacteria, individuals that are unable to synthesize histidine differ in their genotype and in their phenotype compared to other bacteria.
In a culture of bacteria, individuals that are unable to synthesize histidine differ in their genotype and in their phenotype compared to other bacteria.
Lower eukaryotes, plants, lower bacteria, and archaea all contain the old metabolic pathway that generates histidine. The majority of histidine biosynthesis research has been concentrated on Escherichia coli and Salmonella typhimurium, uncovering fundamental regulatory mechanisms in bacteria. An organism's observable attributes or characteristics are referred to as its phenotype, whereas the genetic information passed down through generations is known as its genotype. Bacteria that synthesize histidine do so because of their physical characteristics and genetic makeup, as opposed to bacteria that do not because of those same characteristics and genetic makeup.
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doctors use radioactive iodine as a tracer in diagnosing certain thyroid gland disorders. this type of iodine decays in such a way that the mass remaining after t days is given by the function m(t)
The initial mass of iodine decay after t days is 6 g
How much of the mass remains after 20 days is 1.053 g
Here's the complete question:
Doctors use radioactive iodine as a tracer in diagnosing certain thyroid gland disorders. This type of iodine decays in such a way that the mass remaining after
m(t) = 6e−0.087t
where m(t) is measured in grams.
a) Find the initial mass (mass at time t = 0).
b) How much of the mass remains after 20 days?
a) Find the initial mass (mass at time t = 0).
m(t) = 6e-0.087t
The unit t is assume to be in days.
m(0) = 6e⁰ g = 6 g
b) How much of the mass remains after 20 days?
Using the equation
m(x) = ne⁻⁰°⁰⁸⁷⁽²⁰⁾
m(20) = 6e⁻⁰°⁰⁸⁷⁽²⁰⁾ g ≅ 1.053 g
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2. Congratulations! You are in charge of the world. List the three most important components of your strategy for dealing with urban
growth and sustainability in (a) developed countries and (b) developing countries.
Being in charge of the world , the three most important components of my strategy for dealing with sustainability would be completely different for developed and developing country.
What is sustainable development and how can it be achieved in developed and developing country ?See in today's world if something really is necessary then it is sustainable development , which needs to be approached and installed .Sustainable development is the development of the work along with taking proper care of natural environment.Dealing with these issues would be a different handling operation for developing country and developed country .In the context the statistical data shows that achieving sustainable development in developing country is far more difficult than doing it over developed country.To know more about sustainable development visit:
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Which analogy best describes the spinal cord?
1.A slip-and-slide that makes the nervous system fun
2.A highway for nerve messages to travel from the brain to the body and back
3.A big collection of bones that helps us stand up straight
1 p
If a serving of this food is 29 grams, what percentage of the food is made up of carbohydrates?
Answer: It depend on what you eat. For example, Dietary fibers are complex carbohydrates, so some people estimate that they provide 4 calories per gram just like any other carbohydrate
Explanation:
after two cycles of pcr, how many double-stranded dna molecules correspond exactly to the desired product of amplification (i.e. have both strands the correct length)?
After two cycles of PCR, 4 copies of double-stranded DNA molecules correspond exactly to the desired product of amplification.
What is PCR?The polymerase chain reaction (PCR) is a technique that is frequently used to quickly create millions to billions of copies (complete or partial) of a specific DNA sample. This technique enables researchers to take a very small DNA sample and amplify it (or a portion of it) to a large enough quantity to study in detail. The PCR method of DNA manipulation was created in 1983 by American biochemist Kary Mullis at Cetus Corporation. Mullis and biochemist Michael Smith, who had created other crucial techniques for DNA manipulation, shared the 1993 Nobel Prize in Chemistry.
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PLEASE GIVE ANSWER
The given diagram describes the Calvin cycle of photosynthesis. Where does the NADPH come from?
Answer:
Light-dependent reactions harness energy from the sun to produce ATP and NADPH so Light Reactions
1. Chemical properties describe how a substance changes Trure Or False
Answer:
False
Example:
Only the physical properties like shape, size, appearance etc., are changed. Hence the given statement is false.
Answer:
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