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:
Consider the normal activation of the gene for polygalacturonase in model 3. what is the end result of activation of this gene
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:
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.
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.
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 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.
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.
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.
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.
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 does a cell carry out cellular respiration?
A.
to use up excess oxygen
B.
to consume water
C.
to produce ATP
D.
to deliver glucose to cells
Answer:
C. to produce ATP
Explanation:
Answer from gradpoint
The table shows the relative size of the genomes (total DNA in the nucleus), number of genes, and number of chromosomes for a variety of different organisms. What is the relationship between the complexity of an organism and the number of chromosomes that it has? A) There is a strong tendency for advanced organisms to have more chromosomes. B) There is a strong tendency for advanced organisms to have fewer chromosomes. C) There is no relationship at all between the complexity of an organism and the number of chromosomes. D) There is a weak link between advanced organisms and more chromosomes, but some organisms do not follow this rule.
Answer:
D.
Explanation:
There is a weak link between advanced organisms and more chromosomes, but some organisms do not follow this rule. The correct option is D.
What are chromosomes?Chromosomes are thread-like structures that are found within the nucleus of animal and plant cells.
Protein and a single molecule of deoxyribonucleic acid make up each chromosome.
DNA, which is passed down from parents to offspring, contains the specific instructions that distinguish each type of living creature.
Chromosomes are the highest level of DNA and protein organization. The primary function of chromosomes is to transport DNA and genetic information from parents to offspring.
During cell division, chromosomes play an important role. They keep DNA from becoming tangled and damaged.
Although there is a weak link between advanced organisms and more chromosomes, some organisms defy this rule.
Thus, the correct option is D.
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terminal buttons are located on which part of a neuron?
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.
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.
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.
Jupiter is 84% _______and______% helium
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:
Proprioceptive neuromuscular facilitation refers to a method of stretching that utilizes a passive stretch performed by a partner.
a. True
b. False
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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Explain two ways in which genetic variation is preserved in a population
Genetic variation in a population is preserved through mutations, which are changes in the DNA sequence, and sexual reproduction, which combines genetic material from two parents to create diverse offspring.
Explanation:Genetic variation is essential for the adaptability and survival of a population. Two main ways genetic variation is preserved within a population are through mutation and sexual reproduction. A mutation refers to a permanent change in the DNA sequence of an organism, and it can introduce new genetic material into a population. This new genetic material can result in individual organisms having differing traits, which can be critical for adaptation to the environment or changing conditions.
Sexual reproduction also significantly contributes to genetic diversity. Unlike asexual reproduction, which yields genetically identical offspring, sexual reproduction involves the combination of genetic material from two parents to produce genetically unique offspring. This mixing of alleles increases genetic variance within a population and contributes to a wider range of physical attributes or phenotypes, which can be beneficial for the survival of the species, especially in changing environments.
Overall, preserving genetic variation through these mechanisms is crucial for preventing inbreeding depression, ensuring a population's ability to adapt to new challenges and maintaining overall population health.
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.
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
What happens when people burn fossil fuels?
Phosphorus is removed from the atmosphere
Water is removed from the atmosphere
Nitrogen is removed from the atmosphere
Carbon dioxide is released into the atmosphere
Budding is a form of asexual reproduction characterized by
The correct option for budding is C) Unequal division of cytoplasm and equal division of genetic material. Budding involves a bud forming on the original organism, getting equal genetic material but less cytoplasm before becoming independent.
Budding is a form of asexual reproduction in which:
An outgrowth (or bud) forms on the original organism.This outgrowth receives an equal amount of genetic material but an unequal amount of cytoplasm compared to the parent organism.The bud eventually separates from the parent to form an independent organism.This process is common in some invertebrates, such as hydras and corals. In hydras, the bud develops into an adult and detaches from the main body, while in corals, the bud may remain attached and contribute to colony growth.
complete question:
Budding is a form of asexual reproduction characterized by
A)equal division of cytoplasm and equal division of genetic material
B) Unequal division of cytoplasm and unequal division of genetic material
C) Unequal division of Cytoplasm and equal division of genetic material
D) Equal division of cytoplasm and unequal division of genetic material
When a sperm and an egg first unite a single new cell called a ____________ is formed?
Why are infants and preschool-age children at higher risk for contracting a foodborne illness?
Kersten, a 40-year-old woman, found it impossible to stop smoking and using alcohol during her pregnancy. these behaviors increase risk for:
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