To test the _____ of the hair, you should select a small section of hair at the crown, hold it at the root and the tip, and slide the hair down two to three times slowly.
Which condition is an accumulation of pus in the pleural cavity between layers of the pleural membrane?â?
Pleural empyema is a condition in which there is an accumulation of pus in the pleural cavity caused by microorganisms. Empyema usually occurs after pneumonia, injury or chest surgery. This condition is often seen in children and older adults. Alcoholism, diabetes and a weakened immune system can increase the chances of having pleural empyema after pneumonia.
A key reason older adults suffer bone fractures is as a result of
deficincey of calcium
The extracellular matrix is a coating found on the outside of _____.
A-animal cells
B-proteins
C-carbohydrates
D-plant cells
What enzyme is primarily responsible for antigenic drift?
Name two ways animals have adapted to the landscape of the sahara
Expression of a cloned eukaryotic gene in a bacterial cell involves many challenges. the use of mrna and reverse transcriptase is part of a strategy to solve the problem of _____. expression of a cloned eukaryotic gene in a bacterial cell involves many challenges. the use of mrna and reverse transcriptase is part of a strategy to solve the problem of _____. electroporation nucleic acid hybridization post-translational processing post-transcriptional processing restriction fragment ligation request answer
The use of mRNA and reverse transcriptase is part of a strategy to solve the problem of post-transcriptional processing when expressing a cloned eukaryotic gene in a bacterial cell.
Explanation:The use of mRNA and reverse transcriptase is part of a strategy to solve the problem of post-transcriptional processing when expressing a cloned eukaryotic gene in a bacterial cell.
Eukaryotic mRNAs must undergo several processing steps before they can be translated into a protein. The additional steps involved in eukaryotic mRNA maturation create a molecule that is much more stable than a prokaryotic mRNA.
By using mRNA as a template, reverse transcriptase can make a complementary DNA (cDNA) copy of the mRNA, which can then be used to produce a cDNA library of only the expressed genes in the cell, excluding introns and other non-coding sequences.
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The two intrinsic nerve plexuses serving the alimentary canal are the ________.
Presbyopia is the condition of changes in the eyes that occur with __________.
Crops are protected from disease-causing fungi by use of fungicides or by the use of genetically engineered fungi-resistant crops. Which statement BEST describes how the two techniques differ in reducing fungal infestations of crop plants?
A) Fungicides kill plants infected with fungi, while genetic engineering modifies fungal DNA.
B) Fungicides kill the source of food for fungi, while genetic engineering helps to make fungi-infected plants edible.
C) Fungicides interfere with fungal growth and reproduction, while genetic engineering produces plants resistant to fungi.
D) Fungicides change fungal DNA, while genetic engineering helps the crops and the fungi to form a symbiotic relationship.
Correct answer: C). Fungicides interfere with fungal growth and reproduction, while genetic engineering produces plants resistant to fungi.
Fungicide is a chemical substance that is known to cause toxicity in fungi in order to kill them. Its use can help to reduce the number of fungal infection that causes great loss to plants and its productivity.
In genetic engineering, the DNA of plants is altered in such a way that it produces a toxic protein, which will kill the fungi when it tries to infect them or slow down the growth of the plant.
Why is the carbon cycle important to plants?
Plants remove carbon from the soil to help them convert nitrogen to a usable form.
Plants remove carbon from the atmosphere to help them convert nitrogen to a usable form.
Plants remove carbon from the soil to help them make glucose.
Plants remove carbon from the atmosphere to help them make glucose.
The carbon cycle is important to plants because they remove carbon from the atmosphere to help them make glucose.
How is the carbon cycle useful to plants?Plants make use of carbon in the form of carbon dioxide from the atmosphere to synthesize sugar. The carbon dioxide in the atmosphere is an integral part of the carbon cycle.
Without this process, plants will not be able to survive.
The process is known as photosynthesis and the by-product of the process is oxygen.
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dentify the structure of the human heart which is a large vein (right and left branches) that carries oxygenated blood from the lungs to the left atrium of the heart
would the desert ecosystem be considered an open or closed system
The desert ecosystem is an open system as it exchanges energy and matter with its surroundings.
Explanation:In an ecosystem, whether it is open or closed depends on the exchange of energy and matter with the surroundings. The desert ecosystem can be considered an open system because it exchanges energy and matter with its surroundings. For example, energy from the sun enters the desert ecosystem and is utilized by plants through photosynthesis. Animals in the desert consume these plants, transferring energy within the ecosystem. Additionally, matter such as seeds can also be dispersed by wind or animals, allowing for exchange between the desert and other ecosystems.
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In a new zealand snail species, both sexual and asexual populations can be found in the same geographic region. some field observations indicated that sexually reproducing individuals are more common in the areas infested with parasites, and the reverse is also true. curt lively and mark dybdahl raised uninfected snails from many different asexual clonal lineages and then exposed them to parasites from the wild. what was their finding regarding the proportion of infected individuals, and did the results support the red queen hypothesis?
Which of these answers best describes why antibiotic administration is inappropriate for most of the common upper respiratory tract infections?
polygenic inheritance definition biology
Final answer:
Polygenic inheritance is when a trait is governed by multiple genes, often resulting in a bell-shaped curve of phenotypes in the population, illustrating a gradient from one extreme to another with most individuals being intermediate.
Explanation:
Polygenic Inheritance Explained:
Polygenic inheritance is a type of non-Mendelian inheritance where a polygenic trait is controlled by more than one gene, and each of these genes may have two or more alleles. Unlike Mendelian inheritance that involves a single gene with a clear dominant and recessive allele pattern, polygenic inheritance involves multiple genes contributing to a single trait. This often results in a continuous range of phenotypes, producing a bell-shaped curve in a population analysis. For example, adult height and skin color are human traits affected by polygenic inheritance. Each dominant allele in a series contributes to the phenotype, making it more likely the ultimate phenotype is an intermediate form.
Polygenic characteristics can be exceedingly complex because they involve multiple genes that could be located on the same or different chromosomes. This complexity leads to a wide variety of possible phenotypes for a given trait. A well-known feature of polygenic traits is their tendency to display a wide range of forms in the population, usually depicted by a bell-shaped curve, signifying that most individuals possess a combination of dominant and recessive alleles resulting in an intermediate phenotype.
A natural state of equilibrium; the body attempts to maintain this equilibrium by constantly reacting to external forces that attempt to disrupt this fine balance:
What do the digestive, respiratory, circulatory, and excretory systems have in common?
Answer:
Both get rid of waste material. Explanation:
the surgical creation of an opening between the colon and body surface is known as a/an _____.
a. colostomy
b. nephrostomy
c. gastroduodenostomy
d. gastrostomy
The right option is a.colostomy
A colostomy is a surgical procedure in which an opening is made between the colon and body surface. During colostomy, an opening is made by bringing one end of the large intestine or colon out through the abdominal wall using incision. Colostomy is performed when the large intestine is blocked or damaged and when a ruptured colon causes an abdominal infection. The procedure may be short-term or permanent.
The procedure of surgically creating an opening between the colon and the body surface is known as a colostomy. It is commonly done in cases like bowel obstruction, colorectal cancer, or severe colon injury.
Explanation:The surgical creation of an opening between the colon and the body surface is known as a colostomy. This procedure is commonly performed in cases of bowel obstruction, colorectal cancer, or severe injury to the colon. It allows for waste materials to exit the body through a new, artificial outlet when the natural pathway is blocked or damaged. The choice between the options given is a colostomy, as the other options, such as gastroduodenostomy, gastrostomy, or nephrostomy, are related to different parts of the body, not the colon.
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An s-shaped population growth curve best describes ________.
Final answer:
An s-shaped population growth curve describes logistic growth, which occurs in three phases: rapid exponential increase, reduced expansion as resources dwindle, and stabilization at the environment's carrying capacity.
Explanation:
An s-shaped population growth curve best describes logistic growth. This type of growth occurs in three phases. Initially, population growth is exponential due to the abundance of resources and few individuals. As the population increases, the available resources begin to dwindle, causing the growth rate to decrease. Eventually, the population levels off at the environment's carrying capacity, reaching a steady state where the number of individuals no longer changes significantly.
In logistic growth, despite different populations having unique starting points and growth rates, the overall S-shape of the curve remains consistent. This reflects the universal nature of logistic growth, where initially there is rapid expansion, followed by a decrease in growth, and finally stabilization.
In most tragedies, what happens to the main character
A cork is floating in the open ocean. How does the cork move when a wave passes
A cork floating in the open ocean moves in a nearly circular path as a wave passes, alternating between moving in the direction of wave propagation with the crest and against it with the trough.
As the wave crest moves forward, the cork also moves in the direction of wave propagation. Conversely, when the trough of the wave passes, the cork moves opposite to the direction of wave propagation. This motion is a visible manifestation of the water particles' oscillations, as water waves cause individual particles to move in circular paths at the surface.
Moreover, this circular motion is evident when observing multiple corks positioned in a line on the water surface. Each cork exhibits simple harmonic motion with a slightly different phase. The corks' up and down movement, which is easily noticeable when a wave passes, is an outcome of the energy transfer from the wave to the corks. This movement can also aid in the estimation of the wave's wavelength and period of oscillation.
How many cells and what type of cells are cresteed from meiosis?
Answer:
4 daughter cells that are haploid and genetically different from parent cell.
Explanation:
Meiosis is a kind of cell division that results in daughter cells with a reduced number of chromosome (by half). Meiosis is employed by sexually-reproducing organisms only during gamete formation. Since meiosis is used to produce gametes, which must contain half the number of chromosomes as the parent cell, it occurs in a two step division process namely: Meiosis I and II.
Meiosis I involves the separation of homologous chromosomes (similar but non-identical chromosomes received from each parent). The reduction in chromosomal number occurs in meiosis I i.e. Diploid state (2n) to Haploid state (n).
Each daughter cell produced from meiosis I undergoes another round of division but this time, sister chromatids (replicated chromosomes) separate. This is called meiosis II.
At the end of the meiotic process, four (4) daughter cells (gametes) will result with each possessing a haploid number of chromosome (n).
N.B: The gametes can be genetically different from the parent cell due to the CROSSING-OVER that occurs in the prophase stage. Crossing-over is the exchange of chromosmal material between the non-sister chromatids of homologous chromosomes.
To what kingdom would a unicellular organism found living in an extreme environment belong?
How are tropical rainforests and temperate forests different apex?
Tropical rainforests and temperate forests are different in their Location, Climate, and Dominant tree species.
How are tropical rainforests and temperate forests different?
Tropical rainforests and temperate forests are different in the following ways:
1. Location: Tropical rainforests are found closer to the equator, while temperate forests are found at higher latitudes.
2. Climate: Tropical rainforests are warm and humid, while temperate forests experience all four seasons.
3. Dominant tree species: Tropical species have evolved to fit narrow niches in a relatively constant environment, producing grandiose diversity, while temperate regions have fewer tree species.
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The ecosystem that would most likely have a very high net primary productivity is a
Many of the symptoms of vitamin a deficiency such as blindness and an increase in infectious diseases are related to the role of vitamin a in:
Which statement BEST explains Lamarck's theory of acquired characteristics as it relates to the neck length of giraffes?
Lamarck's theory of acquired characteristics suggests that useful traits, such as increased neck length in giraffes from stretching, could be passed to offspring. This contrasts with natural selection, which favors individuals with advantageous traits that are naturally present, not acquired.
Explanation:Lamarck's Theory of Acquired Characteristics
Jean-Baptiste Lamarck's theory of acquired characteristics suggests that traits developed during an organism's lifetime could be passed on to its offspring. In the context of giraffes, Lamarck hypothesized that their neck length increased because individuals stretched to reach leaves on taller trees, and these longer necks were then inherited by the next generation. His theory implies a purposeful evolution based on the use and disuse of characteristics, where traits that are beneficial for survival become more pronounced over generations, while those of less value diminish.
However, subsequent research and observations, such as those by Scientist B and Charles Darwin, have discredited Lamarck's ideas in favor of natural selection. Scientist B's experiments demonstrated that muscle stretching does not alter bone length or DNA in a way that would be heritable. Alternatively, Darwin's theory of evolution by natural selection posits that creatures with advantageous traits, like giraffes with naturally longer necks, are more likely to survive, reproduce, and pass on their advantageous traits without the need for the traits to be acquired during their lifetime.
What was the role of rosalind franklin in the discovery of the double helix?
Lucia ran a 5k on a hot afternoon. a few hours later, the muscles in her legs began to spasm painfully. what condition was lucia most likely experiencing?
Lucia is experiencing heat cramp, this is a painful, involuntary muscle spasm that is due to her extreme 5k run on a hot afternoon where she loss fluid and electrolyte. Heat cramps are more intense and more prolonged compare to typical leg cramps, it can be managed by taking lot of water, and electrolyte filled drinks.