What are the main points of the cell theory of life
Answers
The main points of the cell theory are:
1. The cell is the SMALLEST living unit of life.
2. The cell is so small is it is not visible to the naked eye.
3. The shape of the cell can vary based on the different lifeforms they are in.
4. The size of the cell also varies.
5. All living organisms or lifeforms are made from cells.
6. Cells originate from a pre-existing cell, in multicellular lifeforms, then the pre-existing cell will divide into many other cells with the process repeating.
7. All cells retain the same properties, such as growth, respiration, and etc.
Related Questions
Food must be broken down into________
before it can pass into the bloodstream.
O A. Molecules
O B. Proteins
O C. Atoms
O D. Liquids
Answers
As good passes through the GI tract, it mixes with digestive juices, causing large molecules of food to break down into smaller molecules. The body then absorbs these smaller molecules through the walls of the small intestine into the bloodstream,, which delivers them to the rest of the body.
"Machines are data hungry. Human are data efficient". support statement with four justifications.
Answers
Answer:
Machines are data hungry because they require large amounts of data for training and decision-making. Humans, on the other hand, are data efficient due to their cognitive abilities, generalization skills, contextual understanding, and creativity. Humans can process information effectively, draw upon prior knowledge, adapt to new situations, and make decisions with minimal data inputs
1) Which of the following statements correctly describes the role of a molecule that controls a
repressible operon?
A) The molecule binds to the promoter region and decreases the affinity of RNA polymerase for
the promoter.
B) The molecule binds to the operator region and blocks the attachment of RNA polymerase to
the promoter.
C) The molecule increases the production of inactive repressor proteins.
D) The molecule binds to the repressor protein and activates it.
Answers
An operon is referred to as repressible if its transcription is typically on until a repressor protein inhibits it.The operator does not readily attach to the repressor protein.It must have the presence of the its corepressor because it is generated in an inactive state.
C) The chemical stimulates the synthesis of dormant repressor proteins.
What causes repressor protein production?As a result, in a functional group known as an operon, structural genes are connected to an operator gene.
In the end, a regulator gene that generates a little protein molecule is called a repressor regulates the operon's activity.
What triggers repressor activation?Repressor,an amino acid binds with met repressor and activates it when it is present.The repressor's presence just on DNA strand prevents RNA production,The repressor separates from the operator whenever the amino acid is absent, and RNA production continues.
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Develop a 1-2 paragraph response to each question (or fill in the table). 1. Considering the limitations of diffusion and osmosis, why does it make sense that life started with small cells in an aquatic environment?
Answers
Small cells in an aquatic environment were likely the starting point for life due to the limitations of diffusion and osmosis in supporting cellular functions.
Why did life most likely begin with small cells in an aquatic environment?The small size of cells and the presence of an aquatic environment align with the limitations imposed by diffusion and osmosis.
Diffusion is the passive movement of molecules from an area of high concentration to low concentration, and osmosis is the movement of water across a semipermeable membrane. These processes are crucial for the exchange of nutrients, gases, and waste products in cells.
In small cells, diffusion and osmosis are more efficient due to the shorter distances that molecules need to travel.
Nutrients and gases can readily diffuse across the cell membrane to support cellular metabolism, while waste products can be efficiently expelled. In an aquatic environment, water provides an ideal medium for these processes to occur, allowing for the exchange of molecules necessary for cellular function.
The combination of small cell size and an aquatic environment creates favorable conditions for the early stages of life. It enables the efficient exchange of substances required for cellular processes, supporting the viability and survival of primitive organisms.
As life evolved and diversified, these foundational characteristics likely persisted, shaping the subsequent development of more complex organisms and their adaptation to various environments.
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Thank you to anyone who answers .
Answers
Answer:
D
Explanation:
Answer:
i think its D but im so sorry if it wrong my second answer would probably be A
Explanation:
i really hope this helps sorry if it doesn't
a substance produced by certain cells in lung tissue that reduces surface tension between fluid molecules quialet chapter 13
Answers
Certain cells in lung tissue produce a substance that reduces surface tension between fluid molecules.
The substance referred to in the question is known as pulmonary surfactant. Pulmonary surfactant is a complex mixture of lipids and proteins that is produced by specialized cells called type II pneumocytes in the lungs. Its primary function is to reduce the surface tension between fluid molecules that line the alveoli, the tiny air sacs in the lungs.
Surface tension is the force that causes liquid molecules to be attracted to each other, creating a cohesive force that can make the alveoli collapse. By reducing surface tension, pulmonary surfactant prevents the alveoli from collapsing completely during exhalation, ensuring their stability and preventing respiratory difficulties.
The lipids in pulmonary surfactant, such as phospholipids, act as surfactants by inserting themselves into the thin layer of fluid that lines the alveoli. This disrupts the cohesive forces between fluid molecules, reducing surface tension and promoting the expansion and stability of the alveoli during inhalation and exhalation.
In summary, the substance produced by certain cells in lung tissue that reduces surface tension between fluid molecules is pulmonary surfactant. Its presence is crucial for maintaining proper lung function and preventing the collapse of alveoli during breathing.
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What is reactivity and what does is have to do it chemistry
Answers
Answer:
In chemistry, reactivity is a measure of how readily a substance undergoes a chemical reaction. The reaction can involve the substance on its own or with other atoms or compounds, generally accompanied by a release of energy. The most reactive elements and compounds may ignite spontaneously or explosively.
( hope this helps!)
I need help please.
Write a series of questions that you have about how the mutated HIV-resistant gene could be used to prevent future AIDS epidemics.
Answers
Answer:
I hope it helps :)I just edit myself in Microsoft
which one of these (food chain or food web) tells us more about the entire ecosystem?
Answers
Answer:
cant see the food chain so i cant really help
Explanation:
what is the correct order of protein production?
1) ribosome
2) endoplasmic reticulum
3) secretory vesicles
4) golgy apparatus
a) 1,2,3,4
b) 2,4,3,1
c) 1,2,4,3
d) 3,2,4,1
Answers
Answer:
The correct order of protein production is:
c) 1,2,4,3
Ribosome: Protein synthesis begins in the ribosomes, which are located either in the cytoplasm or attached to the endoplasmic reticulum.
Endoplasmic Reticulum: After the initial stages of protein synthesis in the ribosomes, the newly synthesized protein is transported into the endoplasmic reticulum (ER) for further processing and modification.
Golgi Apparatus: The proteins synthesized in the ER undergo further processing and modifications in the Golgi apparatus. This includes sorting, packaging, and modifying the proteins to their final functional forms.
Secretory Vesicles: Once the proteins are properly processed and modified in the Golgi apparatus, they are packaged into secretory vesicles. These vesicles transport the proteins to their destination, such as the plasma membrane for secretion outside the cell.
Therefore, the correct order is 1, 2, 4, 3.
Answer:
The correct order of protein production is ribosome, endoplasmic reticulum, Golgi apparatus, and secretory vesicles. So the correct answer would be c) 1,2,4,3.
Many proteins destined for the endoplasmic reticulum, the Golgi apparatus, lysosomes, the plasma membrane, and secretion from the cell are synthesized on ribosomes that are bound to the membrane of the endoplasmic reticulum. The Golgi apparatus then distributes these proteins and lipids that it receives from the ER.
Please help I'll give a brainliest!
Traits can be_________ which means they can be seen and are capable of masking a different trait.
Traits can also be __________ which means they can be masked.
Answers
Recessive
Basic biology! Good luck
Answer:
✔ one allele
✔ each parent
✔ dominant
✔ recessive
✔ gene
Explanation:
Mendelian inheritance states that traits are determined when offspring receive
✔ one allele
for each trait from
✔ each parent
.
Traits can be
✔ dominant
, which means they can be seen and are capable of masking a different trait.
Traits can also be
✔ recessive
, which means they can be masked.
Alleles are different versions of the same
✔ gene
in an organism.
What are Mendel's two laws?
Answers
Answer:
1) the law of segregation
2) the law of independent assortment
Explanation:
cytotoxic cd8 t cells are selective and serial killers of target cells at sites of infection. the killing of infected target cells by effector cd8 t cell is initiated by which molecular interaction at the surface of cells
Answers
The killing of infected target cells by effector CD8 T cell is initiated by CD4 molecule molecular interaction at the surface of cells.
In the host's defense against pathogens that dwell in the cytosol, the most prevalent of which are viruses, armed effector cytotoxic CD8 T cells are crucial.
These cytotoxic T cells can destroy any pathogen-carrying cell by identifying foreign peptides that are carried to the cell surface in an MHC class I molecule-bound manner.
Because killer T cells have unique molecular weapons that allow them to attack and completely destroy other cells showing targets they recognize, such as a virus-infected cell or even a malignant cell, they are known as "cytotoxic" or "cytolytic" cells.
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Which term best describes a specially developed characteristic that enables an organism to live in a specific environment?
answer choices
adaptations
natural selection
survival of the fittest
variations
Answers
Adaptation is the best term to describe a specially developed characteristic that enables an organism to live in a specific environment.
What is adaption?Adaption is the process of adjusting to new conditions or environments. It is an evolutionary mechanism that enables organisms to survive in changing conditions. This can be seen in the way animals and plants adapt to their surroundings and climate, as well as the way that people adjust their behavior to suit their circumstances. Adaptations can occur on both a physical and behavioral level, and often involve changes in behavior, physiology, and anatomy.
Adaptations can include physical, physiological, and behavioral characteristics that allow an organism to thrive in its environment. Examples of adaptations include camouflage, hibernation, migration, and the development of specialized body structures. Adaptations can be either inherited from an organism’s parents or acquired over time through the process of natural selection. Adaptations give organisms an advantage in their environment and help them to survive and reproduce more successfully than organisms without the adaptation.
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Explain how plant life is benefited when microorganisms release carbon dioxide into the soil.
Answers
Answer:
When microorganisms release carbon dioxide into the soil, the acidity of water surrounding soil particles is increased. This increase in acidity allows for rock present in soil to be broken down, releasing minerals into the soil. These minerals are then available for use by plant life.
What is CRF (continuous reinforcement)?
Answers
Continuous reinforcement (CRF) is a type of reinforcement schedule in which a specific behavior is rewarded every time it occurs.
Continuous reinforcement (CRF) is a type of operant conditioning in which a behavior is reinforced every time it occurs. In other words, the desired behavior is consistently rewarded without any gaps or interruptions. This type of reinforcement schedule is highly effective in establishing and maintaining a behavior, as the individual learns to associate the behavior with a positive outcome. However, the behavior may also extinguish quickly if the reinforcement is removed. CRF is often used in animal training and behavioral research, but can also be applied in human learning and therapy. Alternatives to CRF include partial reinforcement schedules, where the behavior is only rewarded some of the time, which can result in more persistent behavior in the long run.
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A student examined two slides in the laboratory, one slide with normally dividing cells and another slide with cancerous cells. Which statement best predicts what the student will observe on the slide with cancer cells compared to the slide with normally dividing cells?
aThe slide with cancer cells will show more cells in interphase because they are growing in preparation for cell division.
b.The slide with cancer cells will show more cells in interphase because the stages of mitosis take longer to complete.
c.The slide with cancer cells will show fewer cells in interphase because the cells are dividing rapidly.
d.The slide with cancer cells will show fewer cells in interphase because the cells are not dividing.
Answers
The answer is option a, The slide with cancer cells will show more cells in interphase because they are growing in preparation for cell division. The correct answer is A.
The slide with cancer cells will show more cells in interphase because they are growing in preparation for cell division. There are some differences between cancer cells and normal cells.
Normally dividing cells go through the cell cycle: G1, S, G2, and M. During G1, cells grow and develop, but they don't begin DNA synthesis. DNA synthesis occurs during S phase, which is followed by G2, where the cell checks and prepares its newly synthesized DNA for mitosis.
Finally, mitosis, which is a sequence of steps during which a cell divides into two identical cells. Cancer cells, on the other hand, do not enter into the G0 phase; instead, they continue to divide.
As a result, they divide more quickly and require more nutrients. Since more cells need to be produced, more cells will be in interphase, growing and developing in preparation for cell division. Therefore, the correct answer is A.
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Which system must interact with the respiratory and digestive systems to transport gases and nutrients throughout the body?
Answers
The circulatory system must interact with the respiratory and digestive systems to transport gases and nutrients throughout the body.
The human circulatory system transport blood, nutrients, and gases throughout the human or other vertebrates' entire body. It includes the heart, blood vessels, and blood. The cardiovascular system, also known as the vascular system, includes the heart and blood vessels.
All cells in the body require the oxygen and removal of waste as well as nutrients. All of the body's cells receive oxygen and water from the respiratory system, as well as nutrients and water from the digestive system. Additionally, wastes are carried by the blood from body cells to organs that remove waste. The heart is the center of the circulatory system because it pumps blood.
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Which type of bond forms disaccharides?
A. 1-4 Hydroxyl bond
B. 1-5 Galactosidic bond
C. Hydrogen bond
D. 1-4 Glycosidic bond
Answers
Answer: D
Explanation:
Disaccharides type of bond forms 1-4 Glycosidic bond
What is the relationship between III-1 to III-2
Answers
Answer:
III 2 IS THE HUSBAND OF III1
when a eukaryotic organism reproduce by budding off a part of its body to create a genetically-identical new organism that will go on to live independently from the parent, this is .
Answers
When a eukaryotic organism reproduces by budding off a part of its body to create a genetically-identical new organism that will go on to live independently from the parent, this process is known as budding.
Budding is a form of asexual reproduction commonly observed in various organisms, such as yeast, hydra, and some plants.
During budding, a small outgrowth or bud forms on the parent organism. This bud gradually grows in size and develops into a complete individual, eventually detaching from the parent organism to lead an independent existence.
The offspring produced through budding inherit the genetic material from the parent, making them genetically identical or clones.
Budding allows for rapid reproduction and colonization of new habitats without the need for a separate mating partner.
It is advantageous in stable environments and can be an effective strategy for species to expand their population size or colonize new areas
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10) which of the following statements is/are true concerning unconventional neurotransmitters. choose the correct option. they are released by the post-synaptic cell and affect the pre-synaptic terminal endocannabionoids, similar to active ingredient of marijuana reduce the release of gaba nitric oxide gas (no) is formed from the amino acid arginine nitric oxide gas (no) may regulate the release of glutamate and play a role in memory, learning, and lowering blood pressure all of the above statements are true concerning unconventional neurotransmitters
Answers
All of the above statements concerning unconventional neurotransmitters are true because they are a class of signaling molecules that function outside the traditional definition of neurotransmitters.
The statement "unconventional neurotransmitters are released by the post-synaptic cell and affect the pre-synaptic terminal" is not entirely accurate.
Examples of unconventional neurotransmitters include endocannabinoids, nitric oxide, and various gaseous molecules.
The statement "endocannabinoids, similar to the active ingredient of marijuana, reduce the release of GABA" is true. Endocannabinoids are lipid-based signaling molecules that bind to cannabinoid receptors in the brain and peripheral tissues.
Activation of these receptors can modulate a variety of physiological functions, including the release of GABA, which is an inhibitory neurotransmitter.
The statement "nitric oxide gas (NO) is formed from the amino acid arginine" is also true.
Nitric oxide is a gas that functions as a signaling molecule in the body. It is produced by the enzyme nitric oxide synthase (NOS), which converts the amino acid arginine into NO and citrulline.
The statement "nitric oxide gas (NO) may regulate the release of glutamate and play a role in memory, learning, and lowering blood pressure" is also true. Nitric oxide has been shown to modulate the release of glutamate, an excitatory neurotransmitter, and may play a role in synaptic plasticity, learning, and memory.
NO has also been implicated in the regulation of blood pressure.
Therefore, the correct option is "Option D: All of the above statements are true concerning unconventional neurotransmitters."
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Which of these statements is true about the gene pool and genetic diversity?
А. The size of the gene pool and genetic diversity are not related to each other.
B. The size of gene pool and genetic diversity are inversely proportional to each other.
C. The size of gene pool and genetic diversity are directly proportional to each other.
Answers
Answer:
C. The size of gene pool and genetic diversity are directly proportional to each other
Explanation:
I had this question asked on a test and got a 5/5
Review the table detailing the mass of Jupiter’s moons and their distance from the planet.
A 3 column table with 4 rows. The first column is labeled Moon with entries Io, Europa, Ganymede, Callisto. The second column is labeled mas in x 10 Superscript 19 Baseline kilograms with entries, 8.932, 4.8, 14.819, 10.759. The last column is labeled Distance from Jupiter in meters with entries, 421700, 671034, 1070412, 1882709.
Which of Jupiter’s moons has the greatest gravitational force with Jupiter?
Io
Europa
Ganymede
Callisto
Answers
The Jupitar moon that would have the greatest gravitational force with Jupiter is Ganymede. Option C
What is the gravitational force?We know that the gravitational force has to do with the force that is exerted by one object on the other owing to the fact that they are all with the gravitational field of the universe. We must know that the universe is a great gravitational field.
The gravitational force that acts on objects in the universe is an attractive force. Hence we know that masses that are in the universe are able to be attracted to each other by reason of the force of gravity that is operating in the universe.
We know that the magnitude of the gravitational force depends on the mass of the objects as well as on the magnitude of the distances that separates the objects in the universe.
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Answer: c Ganymede
Explanation:
Describe the ways that carbon is ‘locked up’ so it is not in the atmosphere.
Answers
(1) as organic molecules in living and dead organisms found in the biosphere
(2) as organic matter in soils
(3) in the lithosphere as fossil fuels and sedimentary rock deposits
The goal of basic science is:
A. to design a new product.
B. to apply a new technology to an old problem.
OC. to understand the world around us.
OD. to solve a specific problem.
Answers
What do you think lies beyond the edge of space? Do you think we can ever know whether or not the Universe is infinite?
Answers
Answer:
sanmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm
Explanation:
Heelp pleaseeeeeeeeeeeee
Answers
Answer:
Option A is the correct option.Explanation:
Goose-bumps are created when tiny muscles at the base of each hair, known as arrector pili muscles, contract and pull the hair straight up. The reflex is started by the sympathetic nervous system, which is responsible for many fight-or-flight responses.Goosebumps occur when the tiny muscle's in our skin's hair follicles, called arrector pili muscles, pull the hair upright.
What is Goosebumps?Goosebumps are the condition of skin when an individual feels fear, cold, and excitement in which small bumps appear on the skin and cause the hair to be erect.
The arrector pili are involuntary and smooth muscles that a person cannot voluntarily contract. Such muscle cells are responsible for the causation of goosebumps.
Therefore, Goosebumps occur when the tiny muscle's in our skin's hair follicles, called arrector pili muscles, pull the hair upright.
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Meat and poultry products must be refrigerated or frozen after processing and before shipment to inhibit spoilage and
growth of pathogens. During transportation and storage, the challenge is to maintain proper refrigeration temperatures.
In the United States, most food is transported by truck. However, meat, poultry, and egg products may be transferred to and
from other modes of transportation during shipment and held at intermediate warehouses as well as at transfer or handling
facilities, such as airports, break-bulk terminals, and rail sidings. Because transportation and storage are vital links in the
farm-to-table food chain, effective control measures are essential at each point in the food distribution chain to prevent
unintentional contamination.
Use the relevant literature and the information in the extract to discuss how the characteristics of a product affects its
packaging and explain the main actions that should be taken to ensure food safety when transporting fresh meat
products. ( 20 marks)
Answers
Proper packaging and temperature control are vital when transporting fresh meat products to ensure food safety and prevent contamination. Adherence to sanitation practices and coordination among stakeholders is crucial.
Fresh meat products require specific packaging to ensure food safety during transportation. Packaging should provide a protective barrier against damage, moisture loss, and contamination. To ensure safety, temperature control is crucial, and refrigerated trucks with monitoring systems should be used.
Sanitary practices, including regular cleaning and sanitization of vehicles, are important to prevent cross-contamination. Proper handling and storage procedures at transfer facilities are necessary. Effective communication among stakeholders is also crucial. By implementing these measures, the risk of contamination and spoilage can be minimized, ensuring the safety and quality of fresh meat products throughout the distribution process.
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What would happen to skeletal muscle if the epimysium were destroyed? Answer in two hundred and fifty words or more.
Answers
The destruction of the epimysium would have significant detrimental effects on skeletal muscle. It would compromise the structural integrity, impair force transmission, reduce protection against mechanical stress, and disrupt vascularization and innervation.
The epimysium is the outermost layer of connective tissue that surrounds skeletal muscle. Its main function is to provide structural support, protection, and elasticity to the muscle. If the epimysium were destroyed, several consequences would occur in skeletal muscle.
Firstly, without the intact epimysium, the structural integrity of the muscle would be compromised. The epimysium plays a crucial role in maintaining the shape and form of the muscle by containing and compartmentalizing the muscle fibers. Its destruction would result in the loss of this support, leading to muscle fiber disorganization and potential muscle deformation.
Secondly, the destruction of the epimysium would compromise the muscle's ability to transmit force effectively. The epimysium acts as a conduit for the transmission of forces generated by the muscle fibers to the tendons, which ultimately connect the muscle to bones. Without the epimysium, there would be a disruption in the force transmission pathway, reducing the muscle's ability to generate and transfer force efficiently.
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