When a sperm and an egg first unite a single new cell called a ____________ is formed?
What is the minimum pulse ox reading the emt wants to maintain in the patient with spontaneous breathing?
A scientific theory can be defined as a well-supported and widely accepted explanation of nature. According to this definition, which statement describes a scientific theory. A) Matter is comprised of atoms. B) The Sun will rise tomorrow morning. C) The Sun will die in 7.5 billion years. D) The universe was created at the Big Bang.
Answer:
The universe was created at the Big Bang.
Explanation:
Which of the following apply to food webs? Select all that apply.
A.Food webs are a group of connected food chains.
B. Arrows in a food web go from the organism that is being eaten to the organism that is eating it.
C. Food webs show that animals only eat one type of food.
D. Arrows in a food web represent the flow of energy in a food web.
E. Food webs show all of the eating patterns in an ecosystem.
Answer:
Option A - Food webs are a group of connected food chains
Option B - Arrows in a food web go from the organism that is being eaten to the organism that is eating it.
Option D - Arrows in a food web represent the flow of energy in a food web.
Explanation:
A food web contain several food chain. Organisms with in one food chain are connected to the organisms of other food chain.
The arrows in a food chain represent the direction of flow of mass and energy. The face of the arrow points to the animal which is eating the animal located at the other end of arrow.
Hence, option A, B and D are correct.
I need help on this question
How does changing the proteins produced in a cell alter what an organism does?
Final answer:
Changing the proteins produced in a cell can alter what an organism does through modifications to the RNA or protein, as well as mutations in the DNA or RNA.
Explanation:
Changing the proteins produced in a cell can alter what an organism does through various mechanisms. For example, modifications to the RNA or protein can affect the amount, function, and stability of the protein. Mutations in the DNA or RNA can also cause a protein to be made incorrectly, resulting in a loss of protein function. This can be detrimental to the organism as proteins are responsible for orchestrating almost every cell function and influencing most of the traits displayed by multicellular organisms.
6.2. males afflicted with kartagener's syndrome are sterile because of immotile sperm, and they tend to suffer from lung infections. this disorder has a genetic basis. suggest what the underlying defect might be.
Final answer:
Kartagener's syndrome likely involves a genetic defect affecting the structure or function of cilia, which can cause immotile sperm and frequent lung infections. The issue could be due to mutations in dynein, a protein essential for ciliary movement.
Explanation:
Kartagener's syndrome is a genetic disorder characterized by immotile sperm and frequent lung infections due to certain genetic defects. The underlying defect could be related to abnormalities in the structure or function of cilia. Cilia are hair-like structures that help with movement and the flow of mucus in various parts of the body, including the respiratory system and the reproductive tract. In males, cilia are present in the respiratory tract and are also key in helping sperm swim, making them essential for fertility. Immotility of sperm in Kartagener's syndrome suggests a link to defective cilia. This could be caused by a mutation affecting the proteins that make up the structure of cilia or affecting the motor proteins that enable cilia to move.
The genetic basis for this condition points to an inherited defect in dynein, a protein that powers the movement of cilia. Since the cilia are not moving properly, it can lead to a buildup of mucus in the lungs, leading to infections, and the immotility of sperm, leading to sterility.
The two areas of the brain that are responsible for the initial storage of information are the ________ and the ________.
The two areas of the brain that are responsible for the initial storage of information are the hippocampus and amygdala.
The input and processing of the initial information of the brain in the limbic system consists of amygdala, hippocampus and limbic cortex out of which hippocampus and amygdala are mainly responsible for the initial storage of information.
The amygdala is situated in anterior temporal lobe within uncus, making reciprocal connection with hippocampus, hypothalamus, orbital frontal cortex and brain stem etc. Stimulus responses are mediated by the amygdala.
The hippocampus is an area in cerebral cortex comprising of three layers and plays a critical role in short-term memory. The hypothalamus receives the inputs from hippocampus via fornix and amygdala via the amygdalofugal pathway and stria terminalis.
Which of the following is the best example of an organism maintaining homeostasis
Answer:
It is Drinking water.
Explanation:
Because homeostasis is when you body is hot it sweats to cool down, drinking water does the same thing.
Which group of organisms is most closely related to archaebacteria) animalia
b.fungi
c.plantae
d.protista?
A distinct and diverse group of Protista is most closely related to archaebacteria for they are both single celled organism. Protista are broad group of eukaryotes that includes all eukaryotic organisms that are not plants, animals or fungi. Some scientists believe that eukaryotes descended directly from archaebacterial and a large number of protists live as parasites of animals and plants as archaebacteria do.
Proprioceptive neuromuscular facilitation refers to a method of stretching that utilizes a passive stretch performed by a partner.
a. True
b. False
Steroid hormones enter a cell by simple diffusion. in doing so, these steroids __________.
The answer is D: Do not initiate cell signaling by interacting with a receptor in the plasma membrane. Signaling molecules that are large and cannot diffuse through the pores of the cell membrane are the ones that initiate internal cell signaling cascade by binding to receptors on the cell membrane.
Steroid hormones enter a cell through simple diffusion, binding to intracellular receptors found either in the cytoplasm or within the nucleus. This triggers cell signaling pathways which directly influence gene expression, thereby controlling the levels of protein synthesis in the cell. As a result, steroid hormones can regulate specific cell processes.
Explanation:Steroid hormones, derived from cholesterol, enter a cell through a process known as simple diffusion. These hormones are hydrophobic and are small enough to diffuse across the lipid bilayer of the cell's plasma membrane. Upon entering the cell, steroid hormones bind to intracellular receptors located in the cytoplasm or within the nucleus.
Following this, the hormone-receptor complex triggers cell signaling pathways, which in turn regulate specific genes on the cell's DNA. This hormone-driven gene regulation acts as a transcription regulator, affecting the synthesis of mRNA molecules of certain genes. This process alters gene expression, determining the quantity of corresponding protein that is synthesized within the cell.
The proteins thus synthesized can alter the cell's structural characteristics or enforce the production of enzymes that catalyze chemical reactions. Therefore, steroid hormones can regulate specific cell processes based on the quantity and functionality of the proteins they influence.
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Why do lipophilic hormones require carrier proteins while being transported in the blood?
Lipophilic hormones, intuitive as the name suggests, tend to dissolve well in lipids/fats than they do in water. Therefore lipophilic hormone does not dissolve well in blood plasma which would affect their diffusion. The carrier proteins are mainly the serum albumins.
Which electromagnetic waves have the longest wavelengths?
It is kinda hard to answer without the answers, huh? Heres the possible answers for this Question!
radio
infrared
gamma
ultraviolet
(at least for my test, dont know about others)
Answer:
Explanation:
The answer is radio
Which of the following best describes succession? A. The changes in species composition in a community over time as species colonize and area. B. The evolution of species through natural selection to becomes different species over time. C. All of these are good descriptions of succession. D. The reduction of biodiversity of an ecosystem over time.
Succession is a process which brings change in the composition of species in a community over a period of time. In this process a community undergoes change for the initial colonization of a new habitat. Succession begins with colonization of an area that has not been previously occupied by an ecological community. Succession continues till the climax community occupies that area.
Succession refers to the changes in species composition in a community over time. It can be primary or secondary, commencing with pioneer species in primary succession. The community eventually reaches an equilibrium state.
Explanation:The term 'succession' best describes option A, that is, the changes in species composition in a community over time as species colonize an area. Succession describes the sequential appearance and disappearance of species in a community over time. Two types of succession namely are primary succession and secondary succession. In primary succession, newly exposed or newly formed land is colonized by living things, often starting with pioneer species who have few soil requirements. Secondary succession occurs when part of an ecosystem is disturbed yet remnants of the previous community remain. As succession progresses, communities will gradually reach an equilibrium state, the composition of species within these communities changing over time until a more or less permanent community is established.
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A purebred plant that has yellow flowers is crossed with a purebred plant that has white flowers. All the offspring have yellow flowers. Which conclusion about yellow flowers is supported by these results?
A:Yellow flower color is a dominant trait.
B:Yellow flower color is a recessive trait.
C:Yellow flower color is a hetero-zygous trait.
D:Yellow flower color is a mono-hybrid trait.
Answer: A Yellow flower is a dominant trait.According to Mendel's first law if a cross is made between two different characters then the dominant character will be the character of the offspring formed.Here when a yellow flowered plant is crossed with white flowered plant then the offspring had yellow colored flower because yellow color is a dominant trait.
A).Yellow flower color is a dominant trait is correct answer. This means yellow is expressed in the F1 generation despite the presence of an allele for white flowers.
The most accurate conclusion about yellow flower color is that it is a dominant trait, as supported by the results of crossing a purebred yellow-flowered plant with a purebred white-flowered plant, where all offspring displayed yellow flowers. According to Mendel's Principles of Dominance, a dominant trait will always manifest in the phenotype of the first generation (F1) in a monohybrid cross if it is present. Therefore, option A: Yellow flower color is a dominant trait is correct.
To understand this in detail:
Mendel's experiments showed that crossing two purebred plants, one with a dominant trait and one with a recessive trait, results in F1 generation hybrids that only display the dominant trait.The hidden or latent trait (white flower color in this case) is the recessive trait, which can reappear in subsequent generations if hybrids are crossed among themselves.Hence, the yellow flower color trait dominates and masks the white flower color trait in the F1 generation.
A human cell placed into a hypertonic solution is likely to a human cell placed into a hypertonic solution is likely to
In a hypertonic solution, where the concentration of solutes outside the cell is greater than inside, a cell will lose water and shrink. This occurs through the process of osmosis. This contrast with a hypotonic environment where cells absorb water and swell.
Explanation:When a human cell is placed in a hypertonic solution, it is exposed to an external environment where the concentration of solutes is higher than inside the cell. In response to this, the water molecules within the cell will begin to diffuse out of the cell in a process called osmosis to balance the concentration of solutes. This outflow of water causes the cell to lose water and consequently shrink, a process known as plasmolysis.
In contrast, in a hypotonic environment where the concentration of solutes is lesser outside than inside the cell, water molecules move into the cell, causing it to swell. The aim in living systems is to maintain cells in an isotonic solution where the concentration of solutes outside and inside the cell is equal, preventing the cells from either shrinking or swelling.
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A ball is thrown vertically upward. what is its instantaneous speed at its maximum height?
Answer:
sorry if this is not clear This is the only way i can explain it
Explanation:
. The instantaneous speed of any projectile at its maximum height is zero
3. The Peripheral Nervous System consists of what?
4. What is the difference between the somatic and autonomic nervous systems?
5. Draw a neuron and label the axon, dendrite and cell body.
6. Describe what roles the dendrites and axons play in a neuron’s transmission of impulses.
7. What are the three types of neurons?
8. What is the sequence of events when someone taps you on the shoulder? (5 steps)
9. What does the cerebrum enable us to do?
10. Compare and contrast the roles of the cerebellum and brain stem.
Concentrations are elevated by hot, sunny days: 2. increases exposure of organisms to ultraviolet light: 3. caused by halocarbons, such as chlorofluorocarbons (cfcs): 4. forms from emissions of sulfur dioxide: 5. montreal protocol aimed to reduce emissions that cause this: 6. a reaction between pollutants and atmospheric compounds that creates over 100 different chemicals: 7. leaches plant nutrients from soils: 8. most pronounced in cities prone to inversion events:
Answer:
All of them is the correct answer trust in me
Explanation:
The human body contains roughly 100 trillion cells. approximately what percentage of those cells are independent microorganisms?
Approximately 90% of the cells in the human body are estimated to be independent microorganisms.
These microorganisms, collectively known as the human microbiota, include bacteria, viruses, fungi, and other microbes that reside in and on our bodies. They are primarily found in areas such as the skin, mouth, gastrointestinal tract, and reproductive organs.
The human microbiota plays important roles in digestion, immune function, metabolism, and overall health. It is worth noting that estimates of the exact percentage may vary slightly in different studies, but the general range is around 90%.
More recent research indicates that the number of human cells and microbial cells in the body may be roughly similar, although there is still some variability among individuals it is still challenging to provide an exact percentage.
Hence, we can say that almost 90% of cells are independent microorganism.
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Final answer:
Approximately 50% of the cells in the human body are independent microorganisms, particularly those in the gut. These microorganisms are vital for digestion, metabolism, and the immune system.
Explanation:
The human body contains over 100 trillion cells, and it is estimated that these cells are outnumbered by bacteria and other microbes by a ratio of approximately 1:1. This means that roughly half of the cells in the human body are independent microorganisms. These microbes, particularly those in the gut, play a crucial role in digestion, metabolism, and the immune system. They have a significant impact on our overall health and well-being.
Insulin is needed to regulate sugar levels in the blood. while every cell in the body contains genes for the production of insulin, it is only produced by a specialized subset of cells in the pancreas. therefore:
Kersten, a 40-year-old woman, found it impossible to stop smoking and using alcohol during her pregnancy. these behaviors increase risk for:
The duodenum of the small intestine being squirted by bile how it works
Why are infants and preschool-age children at higher risk for contracting a foodborne illness?
Jupiter is 84% _______and______% helium
The Cretaceous-Tertiary extinction was most likely caused by _____. an asteroid hitting the earth volcanism both a and b none of the above
The correct answer is option A, an asteroid hitting the earth
Reason -
The extinction event of Cretaceous is considered as a mass extinction process in which near about 3/4th of the species on planet earth became extinct. The researches conducted (found in geologic record) to study the cause of this massive extinction event, revealed presence of iridium metal on the Earth crust which is a rare metal and is usually found in the asteroids or comets. Thus, hitting of planet earth by the asteroids or comets can be considered as a cause of this massive extinction.
How do cells acquire positional information about their location in a developing embryo?
This is by extrinsic chemical signaling from other cells. This way the cells will determine their position in the body axes and also into which type of tissue, organ or structure that they should begin to differentiate. Extrinsic signals are also coupled with intrinsic signaling from mother cells to daughter cells in cell division.
Consider the normal activation of the gene for polygalacturonase in model 3. what is the end result of activation of this gene
In labrador retrievers, a common breed of dog, black coat is dominant to chocolate, normal vision is dominant to progressive retinal atrophy (pra), and normal hip joint is dominant to hip dysplasia. all these genes assort independently. two dogs that are heterozygous for alleles of all three genes are crossed. using rules of probability (not a punnett square), what is the chance that the first pup born to these dogs will be chocolate, have normal vision, and have normal hip joints?
Final answer:
The chance that the first puppy born to two heterozygous Labrador retrievers will be chocolate, have normal vision, and have normal hip joints is 3/32.
Explanation:
In labrador retrievers, the coat color, vision, and hip joint condition are controlled by independent genes with dominant and recessive alleles. A chocolate coat is the result of having two recessive alleles (bb) for the TYRP1 gene, which affects eumelanin production. Normal vision and normal hip joint condition are both dominant traits. When two dogs that are heterozygous for all three genes (BbPpHh) are crossed, the probability of a puppy being chocolate with normal vision and normal hip joints is calculated by multiplying the probability of each independent event.
For the coat color, the probability that the puppy will be chocolate (bb) is ¼ (the chance of inheriting a 'b' allele from each parent). For normal vision and hip joints, the probability is ¾ for each gene, as the puppy can be homozygous dominant (PP or HH) or heterozygous (Pp or Hh) and still exhibit normal traits. Therefore, the combined probability is calculated as ¼ (chocolate) x ¾ (normal vision) x ¾ (normal hip joints), which equals 3/32.