Answer:
There are three distinct kinds of symbiotic associations, that is, commensalism, mutualism, and parasitism. In the given case, that is, when nitrogen becomes readily accessible from another source the UCYN-A will be in a parasitic relationship with other species and will be the obtaining food from them, as this species will not be able to perform the process of photosynthesis in order to generate its own food.
In the parasitic association, one organism, that is, the parasite feeds off of another organism, which is considered as the host, harming it and probably resulting in its death. The parasite thrives on or in the body of the host.
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.
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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Which of the following bacterial cells would best be able to survive an attack by an antibiotic?
a.A bacterial cell that used its toxins to alter its DNA and resist the antibiotic
b. A bacterial cell that had a cell membrane made of ester-linked fatty acids
c.A bacterial cell that lacked receptors on its surface for that antibiotic
d.A bacterial cell that was going through binary fission when the antibiotic appeared
Answer:
c. A bacterial cell that lacked receptors on its surface for that antibiotic
Explanation:
If the bacteria lacks the receptors on its surface meant for that antibiotic then it will be best defense for the survival of that bacteria. It is receptors which interact with the antibiotic so as to permit it inside the cell. Therefore, in the absence of receptors, it doesn't matter how much antibiotic is lying in the external environment of that bacteria, the antibiotic will not be able to enter the bacterial cell to kill it. Hence, the bacteria will be able to survive easily.
Answer:
The correct answer is option c."A bacterial cell that lacked receptors on its surface for that antibiotic".
Explanation:
There are different mechanisms by which bacteria can get antibiotic resistance. One common mechanism is that the bacteria changes the site or changes the receptor that is recognized by the antibiotic to work. Taking into account this adaptation, a bacterial cell that lacked receptors on its surface for the antibiotic from the beginning would best be able to survive an attack by an antibiotic.
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:
The ecosystem that would most likely have a very high net primary productivity is a
After water itself, what are the two primary elements which occur in sea water?
Which of these answers best describes why antibiotic administration is inappropriate for most of the common upper respiratory tract infections?
Name two ways animals have adapted to the landscape of the sahara
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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What is an organism that lives on or in another organism and uses the other organism for nourishment to the detriment of the host organism?
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.
Which state looks like it has an area shaped like the heel of a boot?
Louisiana is the state that looks like it has an area shaped like the heel of a boot, due to its curved southeastern coastline shaped by the Mississippi River and the Gulf of Mexico.
The state that is often referred to as having an area shaped like the heel of a boot is Louisiana. When looking at a map, the southeastern part of Louisiana curves around in a shape that is reminiscent of a heel. This distinctive geographical feature is largely due to the irregular coastline shaped by the Mississippi River and the Gulf of Mexico.
Moreover, different regions of the United States have unique shapes that can be associated with various objects or features.
For instance, Michigan is sometimes called the "mitten" state due to its shape. These colloquial terms are often used to help describe the distinctive shapes of the states in a relatable way.
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?
Presbyopia is the condition of changes in the eyes that occur with __________.
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.
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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What enzyme is primarily responsible for antigenic drift?
A key reason older adults suffer bone fractures is as a result of
deficincey of calcium
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.
Determining alternate solutions to a problem is an important aspect of critical thinking because _______. a. it means that the best solution to a problem can be implemented b. it means that the easiest solution to a problem can be implemented c. each person needs their own solution to a problem d. conclusions must be adjusted when necessary Please select the best answer from the choices provided A B C D
To what kingdom would a unicellular organism found living in an extreme environment belong?
which of the following describes how an abiotic factor can impact the population dynamics in an ecosystem
An abiotic factor can impact the population dynamics in an ecosystem by affecting the availability of resources and creating environmental conditions; examples are the soil, air, etc.
What is the significance of the abiotic factors in the surroundings?Abiotic factors such as temperature, water availability, and soil nutrients impact population dynamics and can cause a decline in the population size, and the favorable conditions and the unfavorable conditions regulate the population growth. Abiotic factors explain how ecosystems function and how species interact with their environment.
Hence, an abiotic factor can impact the population dynamics in an ecosystem by affecting the availability of resources and creating environmental conditions; examples are the soil, air, etc.
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Aerobic respiration uses ________ to convert glucose (or other organic nutrient molecules) back into carbon dioxide and water.
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.
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.
What do the digestive, respiratory, circulatory, and excretory systems have in common?
Answer:
Both get rid of waste material. Explanation:
Has a nucleus and a cell wall that contains chitin
In most tragedies, what happens to the main character
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:
Anciently the one performing the sacrifice would place the animal on the altar with its head to his right. he would then declare his authority by raising his right arm to the square