The source of bacteria in the culture tube in model 1 is from a swab of a desktop. Moreover, there are four variants in the E. coli culture from the initial swab and the variants of E.coli found on the dish grown with triclosan are evolution and selection.
Final answer:
The bacteria in a culture tube model often come from a specimen from the body, with the number of genetic variants determined by colony morphology on a streak plate. After 3 hours, a culture of 1000 E. coli with a 30-minute generation time would grow to around 64,000 bacteria. Detailed drawings or images of streak plates help in observing microbial growth and identifying distinct colony morphologies.
Explanation:
The source of the bacteria in the culture tube in model 1 is typically obtained from a specimen swabbed from a region of the body, such as the skin, and transferred to a culture medium. The number of genetic variants of E. coli in the culture from the initial swab can be determined by observing the different types of colonies that form on a streak plate. These colonies display various aspects of colony morphology such as shape, size, color, and texture, which can help identify different bacterial strains.
When starting with a culture of 1000 E. coli bacteria with a generation time of 30 minutes, one would expect the number of bacteria to increase exponentially as each bacterium divides. After 3 hours, which is 6 generation times (3 hours / 0.5 hour per generation = 6 generations), the number of bacteria would be expected to increase by a factor of 26, or 64 times, resulting in a total population of around 64,000 bacteria (1000 initial bacteria × 26).
During a microbiology lab exercise, students are often instructed to make detailed drawings or take images of their plates, describe the colonial morphology, and use streak-plate techniques to isolate and obtain pure cultures. Streak plating helps dilute the sample to achieve isolated colonies, where each colony usually represents the growth of one bacterial cell. This method allows the oldest section of the streak plate to generally have the most growth, while the newest streaked section has the least.
What kind of sensory adaptation would you hypothesize the cave fish has to allow it to navigate in a cave, including catching and eating food.
The kind of sensory adaptation that the cave fish would have is :
Presence of sense organs on the surface of the cave fishSense organs
The presence of sense organs on the surface of the cave fish will allow the fish detect the presence of prey in the water and also the presence of different chemicals in the water as well.
Navigating through the cave is aided by the pair of eyes also present on the surface of the fish head.
Hence we can conclude that the e kind of sensory adaptation that the cave fish would have is : Presence of sense organs on the surface of the cave fish
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The protein agtr1 (angiotensin ii receptor 1), encoded by gene agtr1, allows for binding of angiotensin ii, which generates diacylglycerol, and in turn activates protein kinase c [
According to the hardy-weinberg principle, if 75% of the alleles in the gene pool are a1 and 25% are a2, what is the proportion of individuals with genotype a1a2 in this population?
According to the Hardy-Weinberg principle, the proportion of individuals with genotype a1a2 in a population can be calculated using the formula 2pq, where p is the frequency of allele a1 and q is the frequency of allele a2.
Explanation:According to the Hardy-Weinberg principle, the proportion of individuals with genotype a1a2 can be calculated using the formula 2pq, where p is the frequency of allele a1 and q is the frequency of allele a2. In this case, the frequency of a1 is 0.75 and the frequency of a2 is 0.25. Therefore, the proportion of individuals with genotype a1a2 is 2(0.75)(0.25) = 0.375, or 37.5%.
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Describe the outer covering of a reptile's egg.
The outer covering of a reptiles egg is hard to protect it from harm while growing. :P
I hope this helped :D
What has led scientists to believe that echinoderms are more closely related to humans and other vertebrates than to cnidarians?
Final answer:
Echinoderms are more closely related to humans and other vertebrates than to cnidarians because both are deuterostomes, a group determined by specific embryonic development patterns and characterized by having a sophisticated endoskeleton.
Explanation:
Scientists believe that echinoderms are more closely related to humans and other vertebrates than to cnidarians because both echinoderms and chordates (the phylum that includes humans) are classified as deuterostomes. This is a significant classification that is determined by the pattern of embryonic development, where in deuterostomes, the anus develops from the first opening in the embryo (the blastopore), and the mouth forms secondarily. In contrast, protostomes develop the mouth from the blastopore. The shared deuterostome development pattern is just one of the reasons echinoderms and vertebrates are considered more closely related. Additionally, echinoderms possess an endoskeleton made up of calcareous ossicles covered by the epidermis, which is conceptually similar to the vertebral endoskeleton of humans and other vertebrates, further supporting the close phylogenetic relationship between the two groups.
Which two systems provides the molecules needed for the metabolic activity that takes place at ribosomes?
Final answer:
Ribosomes in cells require specific molecules like tRNA and mRNA for metabolic activities.
Explanation:
Ribosomes are the cellular structures responsible for protein synthesis in living cells. They consist of large and small subunits composed of ribosomal RNA (rRNA) and proteins. The molecules needed for the metabolic activity at ribosomes are transfer RNA (tRNA) and messenger RNA (mRNA), along with various enzymatic factors that contribute to the translation process.
What is the process called when embryonic cartilage is replaced by bone cells?
Cleaner fish feed off the algae fungi and other microorganisms that are found in larger fish. Other species of fish which look like cleaners are able to approach the larger fish and remove large bites of flesh. If the look alike population outnumber the cleaner fish the A.microorganisms on large fish would decrease B.cleaners and mimics would interbreed C.behavior of large fish would change D.cleaner population would increase
Answer:
C.behavior of large fish would change
Explanation:
thats what jlab says the answer is
A steady supply of _________ is needed throughout the body in order for electrons to be accepted at the end of the electron transport chain.
Answer: Oxygen
The cells use oxygen molecules during oxidative phosphorylation. Oxidative phosphorylation is the final stage of cellular respiration which is made up of two closely connected components: 1) the electron transport chain and 2)chemiosmosis.
Oxygen sits at the end of this electron transport chain, where it accepts electrons and picks up protons to form water. If oxygen is not available to accept electrons, the electron transport chain will cease running, and ATP Adenosine triphosphate) will no longer be produced by chemiosmosis. Without enough ATP, cells can’t carry out the reactions they need to function, causing death.
Help me please!
Darwin hypothesized that there are definite steps to natural selection. Consider the model of bacterial resistance to antibiotics. How would Darwin explain step I?
Question 1 options:
Bacteria adapt to environmental changes.
Some bacteria alter their DNA in response to environmental changes.
In any population, some individuals are weaker than others.
In any population, genetic variation exists.
What is the equation with which you can calculate population density?
Smoke form forest fires is most likely to affect air quality over larger areas for many days when ...
Forest fire smoke affects large area air quality over many days when favorable wind conditions are present, there are larger fires, and the burning is persistent.
Explanation:Smoke from forest fires is most likely to affect air quality over larger areas for many days when there are favorable wind conditions, larger fires, and persistent burning. Favorable wind conditions help to disperse the smoke satisfactorily over a vast area, maintaining its presence in the atmosphere for a longer duration. The larger the fire, the more smoke is produced, leading to a more significant impact on air quality over an extensive area. Lastly, persistent burning causes continued production of smoke, hence more extended periods of polluted air.
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How do animals in the desert defend themselves from predators?
Answer:
anything with there claws
Explanation:
What is likely phenotypic ratio resulting from a dihybrid cross with alleles showing epistatic interactions?
The answer is one (1) phenotype. This is because epistasis interaction of gene alleles involves the masking of one phenotype of an allele of a gene (at one or more loci) by the other. Alternatively, the epistatic alleles may interact to cause a modification of a phenotype.
Final answer:
The phenotypic ratio from a dihybrid cross which includes epistatic interactions differs from the non-epistatic 9:3:3:1 ratio, with the actual ratio depending on the specific nature of the epistatic relationship between the genes involved. One gene may mask the effects of another, altering the expected ratios of phenotypes in the offspring.
Explanation:
The phenotypic ratio resulting from a dihybrid cross with alleles that show epistatic interactions will differ from the classic 9:3:3:1 ratio seen in Mendel's dihybrid crosses with non-interacting genes. This is because epistasis is a form of gene interaction where one gene masks or modifies the expression of another. For example, if one gene's expression is completely dependent on another gene, you might see a modified ratio such as 9:3:4, where the 4 represents the epistatic effect.
In a case of epistasis similar to the one described by the figure, where one gene (C) masks the expression of another (A) for a trait like coat color, the presence of the C allele is necessary for color to be expressed. If it's absent (cc), no color is expressed regardless of the A gene's alleles. Here, the phenotypic ratio can deviate significantly from the typical 9:3:3:1 observed in a dihybrid cross without epistasis. The actual ratio will depend on the specific epistatic relationship between the genes involved.
It's important to remember that the independent assortment of genes and Mendelian inheritance can be altered by various genetic interactions, including epistasis, which must be taken into account when predicting phenotypic ratios in genetics problems.
What term is given to the actual name of a color?
A unique trait that is used to construct a cladogram showing relationships between organisms is called a
There are about 100 calories in 30 grams of swiss cheese. ruth ate 70 grams of this cheese. about how many calories were in the cheese that she ate if the number of calories varies directly as the weight of the cheese?
_____may have evolved from aerobic bacteria and ____ may have evolved from photosynthetic cyanobacteria engulfed by a predatory cell.
__________ is a bacterium that lives in our digestive systems, where it has a beneficial role; but it becomes dangerous when our food or water is contaminated with feces. sciemce
Which structure of a paramecium holds a "reserve copy" of all the cell's genes?
In a Paramecium, the micronucleus holds a 'reserve copy' of all the cell's genes and is essential for sexual reproduction, as well as the formation of a new macronucleus.
In a Paramecium, the structure that holds a "reserve copy" of all the cell's genes is the micronucleus. While the macronucleus manages most of the biological functions such as asexual binary fission, the micronucleus is critical for sexual reproduction and serves as a genetic reservoir. During the sexual reproduction process known as conjugation, the micronucleus undergoes meiosis and subsequent exchange of genetic material with another Paramecium, ensuring genetic diversity. Following conjugation, the micronucleus gives rise to a new macronucleus, thus supporting cellular rejuvenation and ensuring a continuity of the genetic blueprint.
There can be advantages to using fossil fuels. What is one advantage?
A)Fossil fuels are a nonrenewable source of energy, because they are primarily made from the remains of ancient plant and life matter.
B)Fossil fuels are inexpensive and readily available with existing equipment. C)The burning of fossil fuels releases carbon dioxide in the environment, contributing to climate change.
D)The burning of fossil fuels releases harmful chemicals into the environment.
Answer: B)Fossil fuels are inexpensive and readily available with existing equipment.
Explanation:
The fossil fuels are the fuels that are produced inside the heap of the earth crust. These are produced as a result of the geological and biological processes occurring under the surface of earth. These includes the hydrocarbons such as coal, crude oil, natural gas which are formed from the dead remains of the plants and animals.
These fuels are the non-renewable source of energy and these produce large amount of carbon dioxide on burning, this can lead to global warming.
The main advantage associated with these fuels is that they are inexpensive because of the appreciable volume of availability in some regions of the world.
why will a radioactive rock never become completely stable?
Excess of neutrons and protons cause large amount of energy in the nucleus, which cause the instability of the radioactive rock.
What is a radioactive rock?
Radioactive rock consist of atoms of radioisotopes like thorium and uranium.
Excess neutrons or protons in an element's atoms provide extra energy in the nucleus.
That cause the atom to become imbalanced or unstable.
Whether and how radioactive elements can also become stable.
Radiation is emitted by the unstable nuclei of radioactive atoms.
Thus, the because of the nucleus, of the radioactive rock never become completely stable.
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Why anatomical and molecular features often fit a similar nested pattern.in addition descibe a orocess that can cause this not to be the case
Which procedure is performed to affix sagging breasts in a more elevated position??
Final answer:
A breast lift, also known as mastopexy, is performed to affix sagging breasts in a more elevated position. It involves removing excess skin and reshaping the breast tissue to achieve a more youthful and uplifted appearance.
Explanation:
The procedure performed to affix sagging breasts in a more elevated position is called a breast lift, also known as mastopexy. This is a surgical procedure that involves removing excess skin and reshaping the breast tissue to achieve a more youthful and uplifted appearance.
During a breast lift, the surgeon will make incisions usually around the areola and may extend vertically and horizontally depending on the amount of sagging. The breast tissue is then lifted and reshaped, and any excess skin is removed. The nipples and areolas are repositioned to a higher position on the breast.
It's important to note that a breast lift does not significantly change the size of the breasts or provide a fuller appearance. If a patient desires both a lift and an increase in breast size, a breast augmentation with implants may be recommended.
what is cytokinesis
The distribution of terrestrial biomes on earth depends mostly on ________.
The distribution of terrestrial biomes on Earth depends on abiotic factors such as temperature and precipitation.
Explanation:The distribution of terrestrial biomes on Earth depends mostly on abiotic factors such as temperature and precipitation. These factors determine the types of plants and animals that can survive in different regions. For example, tropical wet forests thrive in warm, moist environments, while deserts have low biodiversity due to extreme temperatures and lack of water.
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mickey, who describes himself as heterosexual, frequently drinks to intoxication and has been an intravenous methamphetamine user for years. after mickey developed a high fever and vomiting, his doctor diagnosed mickey with hepatitis
c. mickey most likely contracted hepatitis through . . .
Mickey likely contracted Hepatitis C through his intravenous drug use, as the disease is often transmitted through blood-to-blood contact, such as sharing needles.
Explanation:Mickey, diagnosed with Hepatitis C, likely contracted the disease through his intravenous drug use. Hepatitis C is often transmitted through blood-to-blood contact, and sharing needles, as is common among intravenous drug users, is a well-established risk factor. Even microscopic amounts of methamphetamine used during these sessions can contain the blood of an infected person, which can lead to transmission of the virus to Mickey.
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The cells that make up a human body need oxygen at all times. During periods of exercise and activity, the amount of oxygen needed increases. To meet this increased need, the number of breaths per minute during exercise can be sharply higher than the number of breaths per minute while at rest. Which term BEST describes the process by which cells work together to maintain the needed level of oxygen?
A) homeostasis
B) metabolism
C) osmosis
D) respiration
Why did the number of americans receiving food stamps rise after 2008?
Which term do geographers use to classify an area with unifying physical characteristics?
A physical Region is the term used by geographer to classify an area with unifying characteristics. Regions are areas that are extensively characterized by physical features, human influence and relationship between humanity and the environment. An example of a physical region is the Rocky Mountain in the west.
Answer:
physical region/region
Explanation: