Answer:
He extracted and observed DNA from white blood cells.
Explanation:
F.Miescher was a Swiss physician and a Biologist.He was 41 years old.With his experimental processes he was able to isolate many compounds which contains phosphate from the nuclei of white blood cells.He called these chemicals nuclein.(Nuclei acids) This took place in a Felix-Hope seyler's Lab, In Germany.The discovery was in 1869.
Answer:
D on EDG
Explanation:
What role do dominant and recessive alleles play in determining phenotypes?
Answer:
They determine what everything will look like, by the different combinations of alleles.
Imagine a company that sells robots like the one shown above. The company makes this claim: “This living machine is the perfect companion.” Make a case to either support or refute this claim. How similar are living and nonliving systems?
This is a perfect example of artificial intelligence and machine learning.
What is artificial intelligence?
Artificial Intelligence (AI) is intelligence exhibited by machines, as opposed to natural intelligence demonstrated by animals and humans. Artificial intelligence research is described as the study of intelligent agents, which refers to any system that observes its surroundings and performs actions that optimize its chances of success.
The following are some similarities between living and nonliving objects: both living and nonliving things have mass.
They both take up a considerable amount of room.
They are both made up of fundamental components (cells for living, particles for nonliving things).
Both may be transported at the expense of energy.
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20 POINTS
NEED ASAP
A. What is the function of the genes in DNA molecule?
B. How is DNA compacted to form a chromosome?
C. How is the cell divided during mitosis?
a. Genes are a section of DNA that are in charge of different functions like making proteins. Long strands of DNA with lots of genes make up chromosomes. DNA molecules are found in chromosomes. Chromosomes are located inside of the nucleus of cells.
b. DNA is tightly packed up to fit in the nucleus of every cell. As shown in the animation, a DNA molecule wraps around histone proteins to form tight loops called nucleosomes. These nucleosomes coil and stack together to form fibers called chromatin. Chromatin, in turn, loops and folds with the help of additional proteins to form chromosomes.
c. Mitosis is the phase of the cell cycle where chromosomes in the nucleus are evenly divided between two cells. When the cell division process is complete, two daughter cells with identical genetic material are produced.
A. To carry out these functions, DNA sequences must be converted into messages that can be used to produce proteins, which are the complex molecules that do most of the work in our bodies. Each DNA sequence that contains instructions to make a protein is known as a gene.
B. To package DNA inside the nucleus, cells wrap their DNA strands around scaffolding proteins to form a coiled condensed structure called chromatin. Chromatin is further folded into higher orders of structure that form the characteristic shape of chromosomes.
C. During mitosis, a cell duplicates all of its contents, including its chromosomes, and splits to form two identical daughter cells. ... Meiosis also allows genetic variation through a process of DNA shuffling while the cells are dividing.
Hi can someone please help me with these 3 questions!!!!
The dependent variable being measured in the preceding plant experiment, “How Plants Grow In Response to Light,” is the plant's growth. The independent variable is how the plant grows in response to variations in the amount of light it receives.
What is florist hypothesis?The independent variable is how the plant grows in response to variations in the amount of light it receives.
Determine the variable that will be altered first. In this instance, the plant's exposure to light is altered. The independent variable is this.
A clear, explicit, testable assertion regarding the expected relationship between variables or the explanation for an event is called a research hypothesis (or scientific hypothesis).
Therefore, plant growth, hormone concentration, shoot and root, floral pattern development are the part of data in the hypotheses.
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Identify a human disorder with developmental limitations that results from changes in chromosome number. Explain how nondisjunction leads to changes in chromosome number.
Answer:
The Klinefelter syndrome is caused by the presence of one extra X chromosome (i.e., XXY males). Developmental limitations of this genetic disorder include: reduced muscle mass, neurodevelopmental problems, hypogonadism, etc. Abnormal chromosome numbers (known as aneuploidies) are usually caused by the nondisjunction of homologous chromosomes during Anaphase I or the nondisjunction of sister chromatids during Anaphase II
Explanation:
The Klinefelter syndrome is the most common sex chromosomal disorder in males, which is caused by the presence of an extra X chromosome (i.e., males with a XXY karyotype). This genetic disorder has many effects on development, including small testes (hypogonadism), weaker muscles, longer arms and legs, larger breasts than normal, infertility, immature development of secondary male sex features, cognitive problems (e.g., speech and language delays), etc. A chromosomal disorder occurs when chromosome pairs or chromatids fail to separate during meiosis, thereby producing cells (gametes) with more or fewer chromosomes than normal, a phenomenon known as aneuploidy.
Which proposed amendment to the Constitution was passed by the Congress in the early 1970s but failed to receive the necessary three-fourths majority
The proposed Equal Rights Amendment (ERA) to the Constitution was passed by the Congress in the early 1970s but failed to receive the necessary three-fourths majority for ratification.
The Equal Rights Amendment (ERA) was a proposed amendment to the United States Constitution that aimed to guarantee equal legal rights for all citizens regardless of their sex. It was passed by the U.S. Congress in 1972 and sent to the states for ratification. However, the ERA ultimately fell short of the required three-fourths majority needed for it to be added to the Constitution.
The ERA faced significant opposition and controversy during its ratification process. Opponents argued that the amendment could potentially erode traditional gender roles, disrupt family structures, and undermine existing laws that provided protections for women. Several conservative groups mobilized against the ERA, expressing concerns about unintended consequences and the potential impact on women's rights.
Ultimately, the deadline for ratification expired in 1982, and the ERA fell short of the necessary approved from three-fourths of the states. However, the ERA continues to be a topic of debate and activism, with efforts to revive the amendment and extend the ratification deadline ongoing in recent years.
The proposed Equal Rights Amendment (ERA) was passed by the U.S. Congress in the early 1970s but failed to secure the required three-fourths majority from the states for ratification. The ERA aimed to ensure equal legal rights for all citizens, regardless of their sex. Despite its failure to be added to the Constitution, discussions and efforts to revive the ERA have persisted in pursuit of gender equality.
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i am usually single-stranded. is it DNA O RNA ?
Answer:
RNA
Explanation:
DNA is double-stranded DNA mostly and RNA is single stranded mostly.
The T4 bacteriophage could not infect Staphylococcus aureus because this bacterium doesNOT possess aA) lipopolysaccharide outer membrane.B) teichoic acid outer membrane.C) pili.D) flagella.
A) lipopolysaccharide outer membrane. The T4 bacteriophage is a virus that infects bacteria by attaching to specific receptors on the bacterial cell surface.
In the case of Staphylococcus aureus, this bacterium lacks a lipopolysaccharide outer membrane, which is one of the key receptors that the T4 bacteriophage uses to attach and infect bacterial cells. Therefore, the T4 bacteriophage is unable to infect Staphylococcus aureus due to the absence of this critical receptor. Teichoic acid outer membrane, pili, and flagella are not directly involved in the process of bacterial infection by T4 bacteriophages.
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as insulin is released, it is wrapped in a sac as it moves across a cell membrane to enter the bloodstream, circulating until it finds its target cell. what is this process called?
The process in which insulin is released, wrapped in a sac and moved across a cell membrane to enter the bloodstream and circulate until it finds its target cell is called exocytosis.
Exocytosis is the process by which a cell releases materials to the exterior by fusing a vesicle containing the materials with the cell membrane and forcing its contents out of the cell. It is an active transport process in which the materials to be transported are packaged in vesicles and secreted out of the cell by fusion with the plasma membrane. In this case, insulin is secreted from the pancreatic beta cells into the bloodstream by exocytosis.
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Question 19 (2 points)
Enzymes are not considered to be reactants in a chemical reactions because
Answer:
they are needed for activation energy.
Explanation:
If they are needed for activation energy. Just like you don't say chloroplasts are a reactant in photosynthesis.
which biome has nutrient rich soil?
Answer:
Temperate Grasslands/ Grasslands
Explanation:
This biome's soil is fertilized and it is rich because of the decay of deep.
(I hope this make sense)
there are ________ different skeletal muscles that are responsible for the movement of the body through contractility, extensibility, and elasticity.
When muscles shorten or contract, the bone moves as a result. Skeletal muscle pairs work together. When the first muscle contracts, the other muscle relaxes.
How many bones in a human body are skeletal?Normal human infants have about 270 bones, which combine to make 206–213 bones in adults. There is variety in the number of bones since some people may have a different number of ribs, vertebrae, and digits.
What distinguishes it as a skeletal muscle?The vertebrate muscular system includes skeletal muscles, also referred to as muscles, which are typically connected to the skeleton's bones by tendons.
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Any being that uses the sun's energy to create carbohydrates (sugars) is a
A.secondary producer
B.secondary consumer
C.primary consumer
D.primary producer
Answer:
A
Explanation:
Answer:
D.primary producer
Explanation:
which of the following groups would be most likely to exhibit uniform dispersion?a) red squirrels, who actively defend territoriesb) cattails, which grow primarily at edges of lakes and streamsc) dwarf mistletoes, which parasitize particular species of forest treed) lake trout, which seek out cold, deep water high in dissolved oxygen
The group most likely to exhibit uniform dispersion would be (a) red squirrels, who actively defend territories. Uniform dispersion is a type of population distribution where individuals are evenly spaced throughout a habitat.
This pattern typically occurs when individuals actively compete for limited resources or space. Red squirrels are known for being territorial and fiercely defending their space, which can lead to evenly spaced individuals in a population.
In contrast, cattails (b) grow primarily at the edges of lakes and streams, which can lead to clumped dispersion, while dwarf mistletoes (c) parasitize particular species of forest trees, which can lead to random dispersion. Lake trout (d) seeking out cold, deep water high in dissolved oxygen may also lead to clumped dispersion.
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Plants lack bones, but they have left many fossils. What decay-resistant plant material is largely responsible for the occurrence of plant fossils
The decay-resistant plant material largely responsible for the occurrence of plant fossils is lignin. Lignin is a complex organic polymer found in the cell walls of vascular plants, providing strength and rigidity to the plant tissues. It is highly resistant to decay and decomposition, making it an important factor in the preservation of plant fossils.
When plants die and become buried under sediment, the process of fossilization begins. Over time, layers of sediment accumulate, exerting pressure on the plant remains. This pressure, combined with the gradual replacement of organic material by minerals, leads to the formation of fossils. During this fossilization process, lignin acts as a protective barrier, inhibiting microbial degradation and preventing complete decomposition of the plant material.
While softer plant tissues, such as leaves and stems, may decay relatively quickly, the presence of lignin in woody tissues, such as tree trunks and branches, provides a more durable and resistant structure. Lignin's chemical properties make it difficult for microorganisms to break down, allowing for the preservation of plant tissues over long periods.
Fossils of woody plants, such as trees and shrubs, are particularly common in the fossil record due to the presence of lignin. The preservation of wood tissues in the form of petrified wood or coal is a testament to the longevity and resistance of lignin.
In summary, the decay-resistant plant material responsible for the occurrence of plant fossils is lignin. This complex polymer found in the cell walls of vascular plants provides strength and resistance to decay, allowing for the preservation of plant tissues over geological timescales. The presence of lignin, especially in woody tissues, contributes to the abundance of plant fossils, providing valuable insights into the history and evolution of plant life on Earth.
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how does the position of the gray and white matter differ in the spinal cord and the cerebral hemispheres?
In the spinal cord and cerebral hemispheres, the organization of gray and white matter differs. Gray matter mainly consists of neuronal cell bodies, while white matter is composed of myelinated axons.
In the spinal cord, gray matter is found in the central region, forming an H-shaped or butterfly-shaped pattern. The gray matter is surrounded by white matter, which forms the outer portion of the spinal cord. This arrangement allows the gray matter to process and integrate information from the peripheral nervous system, while the white matter transmits signals to and from the brain.
In contrast, the cerebral hemispheres have an outer layer of gray matter called the cerebral cortex. The white matter is found beneath the cortex, forming the inner part of the cerebral hemispheres. This organization allows the gray matter to process and integrate information at the highest level in the brain, while the white matter facilitates communication between different regions of the cerebral cortex and with other parts of the central nervous system.
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Glaciers, such as the Hubbard Glacier
in Alaska shown here, form when the climate remains cold over a
long period of time. Sudden or drastic changes in the climate can
have significant effects on the formation and growth of a glacier.
How might a glacier be affected by dramatic changes in climate?
Dramatic climate changes can lead to glacier retreat, decreased accumulation, increased melting, altered hydrology, and changes in precipitation patterns.
Dramatic changes in climate can have significant effects on glaciers. One key impact is the alteration of the accumulation and ablation processes that maintain the glacier's mass balance. Warmer temperatures and increased melting can lead to a higher rate of ablation (loss of ice through melting and sublimation) compared to the rate of snowfall and accumulation. This can result in a negative mass balance, causing the glacier to shrink and retreat.Changes in climate can also affect the glacier's hydrological system. Increased melting can lead to higher water inputs, causing changes in the flow patterns and behavior of the glacier. This can result in increased crevassing, accelerated ice flow, and changes in the glacier's shape and topography.Additionally, changes in climate can impact the availability and distribution of precipitation. Alterations in the timing, intensity, and type of precipitation (such as snowfall) can affect the glacier's accumulation rates and overall health.In summary, dramatic changes in climate can lead to reduced mass balance, altered hydrology, and changes in precipitation patterns, all of which can significantly impact the formation, growth, and stability of a glacier.For more such questions on Climate changes:
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Thomas constructs a model by completing the following steps.
1. Draw a diagram that shows where oxygen is found on Earth, including the atmosphere, bodies of water, land, and living things.
2. Draw arrows to show how oxygen moves and changes form from one location to another.
3. Label each arrow.
Thomas has constructed an example of what type of ecological model?
A. biogeochemical cycle
B. food web
C. energy pyramid
D. geological system
Answer:
B
Explanation:
saw the answer
Which of these can cause sensorineural deafness?
a. otosclerosis
b. otitis media
c. degeneration of the hair cells in the spiral organ of Corti
d. rupture of the eardrum
Sensorineural deafness can be caused by option C, degeneration of the hair cells in the spiral organ of Corti.
Sensorineural deafness, also known as nerve deafness, is a type of hearing loss that occurs due to damage to the sensory hair cells or nerve pathways in the inner ear. This type of hearing loss can be , or age-related and is often permanent. Sensorineural hearing loss can result from various factors, such as noise exposure, genetic mutations, infections, ototoxic drugs, or head trauma. Symptoms of sensorineural hearing loss may include difficulty hearing certain frequencies, speech comprehension problems, tinnitus (ringing in the ears), and decreased sound perception. Treatment options for sensorineural hearing loss may include hearing aids, cochlear implants, and assistive listening devices. Prevention of sensorineural hearing loss includes protecting the ears from loud noises, avoiding ototoxic medications, and early treatment of infections or injuries.
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practical work is importance in studying science why
Practical work is essential in studying science because it allows for hands-on learning, experimentation, and application of theoretical concepts.
Practical work plays a crucial role in studying science as it provides students with the opportunity to engage in hands-on learning experiences that help them better understand scientific concepts and theories.
Through practical work, students can observe and analyze scientific phenomena, carry out experiments, collect and analyze data, and draw conclusions based on their findings.
This not only enhances their understanding of science but also develops their critical thinking, problem-solving, and experimental skills.
Moreover, practical work allows students to experience the challenges and complexities of scientific research, which prepares them for real-world scientific practices.
Therefore, practical work is not just important but also essential in studying science as it provides students with a comprehensive and practical understanding of scientific concepts and prepares them for future scientific endeavors.
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What are chromosomes ? explain
Explanation:
sana po makatulong sainyo
What are chromosomes?
Answer:Chromosomes are thread-like structures found within the nucleus of both animal and plant cells. Protein and a single molecule of deoxyribonucleic acid make up each chromosome (DNA). DNA is passed along from parents to children and carries the precise instructions that distinguish each living thing.
The word "chromosome" is derived from the Greek terms "chroma" and "body" (soma).
--------------------------hope it helps...have a great day!!Select the three hypotheses.
Grass prevents erosion when planted on a hillside.
Eating sweets may affect weight gain in children.
Brand X battery maintains a charge longer than brand Y.
Hummingbirds are aggressive animals.
A child will catch a cold if she plays in the rain.
If a plant receives fertilizer, it will grow at a faster rate.
Answer:
Eating sweets may affect weight gain in children.
A child will catch a cold if she plays in the rain.
If a plant receives fertilizer, it will grow at a faster rate.
Hypothesis is an educated guess. It is necessary to have a Hypothesis before performing an experiment. There are also other steps or requirements you need before conducting experiments. A Hypothesis usually has what is known as an if-then statement. Example: If do da do, then this will occur. "IF" is the first part, "THEN" is the second part of the statement.
A heterozygous brown hair person is crossed with a homozygous blonde hair person. What are the genotypes and phenotypes of the offspring?
Where is the main store of phosphorus ?
Answer:
Phosphorus is most commonly found in rock formations and ocean sediments as phosphate salts.
Answer:
The largest reservoir of phosphorus is in sedimentary rock. It is in these rocks where the phosphorus cycle begins. When it rains, phosphates are removed from the rocks (via weathering) and are distributed throughout both soils and water. Plants take up the phosphate ions from the soil.
1.
Which of the following is the correct order from DNA to traits
a. Proteins --> DNA --> genes --> traits
b. DNA --> genes -> protein --> tait
I
C. DNA --> genes-> traits --> proteins
d. Tráit --> protein --> DNA --> Gene.
Answer:
B
Explanation:
Genes are sections of DNA that hold the instructions for building proteins that ultimately code for traits.
what happens to bacterial growth after 40∘ c
Answer:
It depends on the type of bacteria.
Explanation:
Without more information, it would be impossible to tell what would happen to bacterial growth after 40 C. Some bacterial growth will slow, some will undergo a population explosion.
Which period represents the last 2 million years of geologic time?
Why aren't human populations evolving to produce immune systems that are able to fight off MRSA and other "superbugs"?
Answer: There are genes that code for different cell receptors that detect foreign substances. And for the immune system to fight these superbugs, the genes encoding these receptors must mutate and evolve. Humans have a slow rate of evolution, slower than bacterial evolution. Then not only human genes mutate at a very slow rate, but insect genes mutate very fast and can improve their strategy to evade the immune system.
Explanation:
A mutation is a random change in the nucleotide sequence or in a gene, which produces a variation in its characteristics and which is not necessarily transmitted to the offspring. They occur spontaneously by the action of mutagens, which are physical, chemical or biological agent that changes the genetic information of an organism and thereby increases the frequency of mutations above the natural level. In multicellular organisms, mutations can only be inherited when they affect the reproductive cells, called gametes (egg and sperm) A consequence of mutations can be, for example, a genetic disease, or it can also be a favorable improvement such as being able to fight against a virus. However, even if in the short term mutations could detrimental, they are essential for our long-term existence becuase without mutations there would be no change, and without change life could not evolve.
The immune system is the body's natural defense against infections, such as bacteria and viruses. The body attacks and destroys invading infectious organisms by the coordinated action of cells and proteins. Any substance or compound produced by an organism is a potential antigen when it is recognized as foreign by the immune system of another organism, whether it is of the same or a different species. In addition, the genes code for different cell receptors that detect these foreign substances. And for the immune system to fight these superbugs, the genes encoding these receptors must mutate and evolve. But, humans have a slow rate of evolution, slower than bacterial evolution. Then not only human genes mutate at a very slow rate, but insect genes mutate very fast and can improve their strategy to evade the immune system. Therefore, the human population may not have mutations that improve the immune system to help it fight againts these superbugs.
9. what would happen to a red blood cell that was placed into a solution of 10% nacl? 0.1% nacl? 0.8% nacl? (blood has about 0.8% salt). how would this differ (or be the same) with a plant cell?
A red blood cell (RBC) that was placed into a solution of 10% nacl will shrink.
Because of the difference in osmotic potential generated by the salt water solution, water will diffuse out of the red blood cells (RBC), causing them to shrink in size. Osmosis is a physico-chemical process that results from pressure changes. Due to the "water-stealing process," the majority of the bacteria will have their cells killed during the curing(*) of meat and vegetables.
Consequently, when we insert blood red cells (RBC) in a salty solution, pressure created by concentration differences, of salt, higher outside, will cause salt come in, according to cell-self-protection mechanisms, not too much, and water will come out, finally causing the cell to shrink.
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A pathogenic RNA molecule is called a...
capsid
Virion
Virold
prion