Let's list the given options alphabetically to choose the appropriate answer.
One reason cancer cells are easier to culture than normal cells extracted from an organism is that ________. Group of answer choices
A. cancer cells grow in a more regulated fashion.
B. cancer cells do not need to adhere to a substratum to grow.
C. nutrient requirements for cancer cells are precisely defined.
D. cancer cells are better models for demonstrating what happens in an intact organism
Answer:
B.
Explanation:
Cancer cells are easier to culture in comparison to normal cells because cancer cells do not need to adhere to a substratum to grow.
As cancer cells are uncontrolled growth of cells and they do not require any substratum to grow and can easily grow to a culture while a normal cell require optimal conditions to grow in a culture.
Hence, the correct option is "B".
Place the 4 steps of biofilm formation, listed below, in the correct order.
1. Surface (substratum) is preconditioned by environmental molecules.
2. Quorum sensing and the establishment of the extracellular matrix commences as microbes attach more stably.
3. Biofilm matures and some microorganisms escape to the planktonic state.
4. Microbes attach and detach from the preconditioned surface.
Answer:
1. Surface (substratum) is preconditioned by environment molecules.
4. Microbes attach and detach from the preconditioned surface.
2.Quorum sensing and the establishment of the extracellular matrix commences as microbes attach more stably.
3. Biofilm matures and some microorganisms escape to the plank-tonic state.
Explanation:
Biofilm is a process in which microorganism irreversibly attach and grow on the surface to produce extra cellular polymers that facilitate formation of matrix. The biofilm process takes three days for the formation after which thickness of plaque increases. There are 4 main steps in biofilm formation. Surface is preconditioned by environment molecules. The microbes attach the preconditioned surface. Establishment of extra cellular matrix and finally biofilm matures.
what is the volume of a cylinder if the height is 6 cm and the radius is 4 cm?
Answer:
v = πr²h
v = 3.142*4²*6
v = 301.71cm³
Explanation:
volume of the cylinder = πr²h
an example of biogeochemical cycle would be the A. carbon cycle B. fire cycle C. trophic cycle
Answer:
Carbon Cycle
Explanation:
What is each half of a chromosome called?
O A. Demisome
OB. Spindle Fiber
C. Chromatid
D. Centromere
Answer:
cromatidaida
Explanation:
Answer:
the answer is C
''chromatid''
Explanation:
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which type of cell(s) contain ribosomes?
Answer:
Ribosomes are found in prokaryotic and eukaryotic cells; in mitochondria, chloroplasts and bacteria. Those found in prokaryotes are generally smaller than those in eukaryotes. Ribosomes in mitochondria and chloroplasts are similar in size to those in bacteria. hope this is good enough to help you
Explanation:
A key component in the formation of organic compounds, such as nucleic acids and ATP
The correct answer is Phosphorus I just took the test.
What do nitrifying bacteria do?
Answer: Nitrifying bacteria such as Nitrosomonas play an important role in providing nitrogen to plants and limiting carbon dioxide fixation. They are found widely distributed in soil or water, where there are large amounts of ammonia, such as lakes or streams into which treated and untreated sewage is pumped.
Explanation:
Answer:
They change Nitrogen to Nitrite and ammonia. Which helps plants to use Nitrogen even though it's in another form.
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what in your home would be considered something you could study in biology?
Answer:
Food and plants!
Drag each characteristic to the correct location on the phylogenetic tree. Complete the phylogenetic tree by matching each characteristic that arose during the evolution of animals to its correct position.
Answer:
The correct characteristics are - tissue, coelom, segmentation, endoskeleton, and backbone from top to bottom boxes.
Explanation:
Answer:
issue, coelom, segmentation, endoskeleton, and backbone
Explanation:
plato
As human travel increases, the number of introduced species likely
decreases.
increases
stays the same
is eliminated
Answer: The correct answer to the question is option B
INCREASES.
As human travel increases(As humans move from one place to another),the number of introduced species likely increases because as humans move from one place to another,they introduce new species of organisms to their new environment.
These non-native species grow in this new environment,becomes economically important and doesn't pose any harm to their new ecosystem unlike invasive species that poses a substantial harm.
The number of introduced species are likely to : ( B ) Increases
As Humans migrate from one place to another they introduce new species into their new environment naturally or artificially.
MigrationThe movement of humans or any type of organism comes with the introduction of new species because as they move they take along with them certain species that naturally do not belong to their new environment.
Hence we can conclude that As human travels The number of introduced species are likely to Increase.
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How are surface waves different from body waves? Which are more damaging?
Answer:
Explanation:
surface waves decay more slowly with distance than body waves, which travel in three dimensions. Particle motion of surface waves is larger than that of body waves, so surface waves tend to cause more damage.
Answer:
surface waves decay more slowly with distance than body waves, which travel in three dimensions. The particle motion of surface waves is larger than that of body waves, so surface waves tend to cause more damage. Surface waves. Their side-to-side motion (like a snake wriggling) causes the ground to twist from side to side, that's why Love waves cause the most damage to structures. Rayleigh waves create a rolling, up, and down motion with an elliptical and retrograde particle motion confined to the vertical plane in the direction of propagation.
Explanation:
When you centrifuge the DNA isolated from the bacteria, the DNA separates into two classes. One class of labeled DNA includes very large molecules (thousands or even millions of nucleotides long), and the other includes short stretches of DNA (several hundred to a few thousand nucleotides in length). Which two classes of DNA do these different samples represent
Answer:
Leading strand and Okazaki fragments
Explanation:
The two classes of DNA that the different samples represent include the leading strand and the Okazaki fragments.
The large molecules DNA with thousands/millions of nucleotides constitutes the leading strand of the DNA while the short stretches of DNA with just a few thousand nucleotides in light constitute the Okazaki fragments.
This is because, during replication, the leading strands of DNAs are usually synthesized in a continuous manner and end up forming a long, continuous daughter strand while the lagging strands are usually synthesized in short, discontinuous fragments known as the Okazaki fragments.
The continuous/discontinuous replication of the leading/lagging strands of the DNA is due to the characteristics of the enzyme responsible for adding bases to the growing daughter strands. The DNA polymerase enzyme can only add nucleotides in the 5' to ' direction.
The image shows a food web in an Arctic ecosystem. Rising temperatures in the Arctic Ocean can lead to large die-offs of phytoplankton, which are autotrophs. What would most likely happen in an Arctic ecosystem if the phytoplankton population decreased?
Answer:
as the population of phytoplankton decreases, the amount of food for zooplancktons decreases
In part A, you analyzed genes that contribute to two diseases. (cystic fibrosis and muscular dystrophy) How can scientists use this information to develop new treatments for these diseases? Based on your findings, do you think that scientists will need to develop multiple treatments to control symptoms of these diseases? Explain your reasoning.
Answer:
By designing suitable gene therapies in order to restore target gene expression.
Explanation:
Cystic fibrosis and muscular dystrophy are inherited genetic disorders associated with serious health problems. Cystic fibrosis is caused by mutations in the gene that encodes for the cystic fibrosis transmembrane conductance regulator (CFTR) protein, and it is a condition associated with abnormal production of sticky mucus that leads to problems in the lungs and the digestive systems. On the other hand, muscular dystrophy is produced by mutations in genes localized on the X chromosome such as, for example, the gene 'dystrophin'. Gene therapy is an experimental approach used to compensate abnormal gene function by introducing exogenous genetic material and thus restore their altered protein products. Consequently, personalized gene therapies can be useful to treat inherited disorders such as cystic fibrosis and muscular dystrophy.
Examine the statement. A scientific theory can become a scientific law, but a scientific law cannot become a scientific theory. If the statement is true, select “True.” If it is false, select the option that is true 1.) True 2.) A scientific theory can become a scientific law, and a scientific law can become a scientific theory. 3.) A scientific law can become a scientific theory, but a scientific theory cannot become a scientific law. 4.) A scientific theory cannot become a scientific law, and a scientific law cannot become a scientific theory.
Answer:
It's true.
Explanation:
In general, a scientific law is the description of an observed phenomenon. It doesn't explain why the phenomenon exists or what causes it. The explanation of a phenomenon is called a scientific theory. It is a misconception that theories turn into laws with enough research.
When the scientists test the idea, they develop a theory by following a set of logical steps. A theory becomes a scientific law once it has been rigorously examined and accepted. Thus, option A is correct.
What A scientific theory can become a scientific law?One prevalent fallacy is the idea that hypotheses eventually become laws. Despite the number of supporting examples, hypotheses do not actually become laws after repeated testing.
Scientific laws, like theories, explain occurrences that the scientific community has determined to be verifiably true. In general, laws explain what will occur in a specific circumstance and are proven by a mathematical equation, whereas theories explain how the phenomenon occurs.
Therefore, A testable explanation of a natural event is what constitutes a scientific hypothesis. The concept of gravity, for instance, explains why an apple always falls to the ground when.
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who discovered micro organisms
Robert Hooke is the person that discovered Micro organism
Answer:
An English architect, "Robert Hooke" discovered micro organisms in 1665.
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Why are the testes located in the scrotum rather than inside the ventral body cavity? _______________________________
Answer:
the scrotum provides a slightly cooler temperature for optimal sperm production
Explanation:
What is biology??And what does it came from??
Answer:
BIOLOGY IS THE STUDY OF LIFE
Explanation:
Answer:
Biology is studying about life and the human body. The term biology in its modern sense appears to have been introduced independently by Thomas Beddoes (in 1799)
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How does the body prevent the loss of sugar in urine?
Answer:
Drinking enough water prevents dehydration and also helps the kidneys remove extra sugar from the body in the urine. Those looking to reduce blood sugar levels should reach for water and avoid all sugary drinks, such as fruit juice or soda, which may raise blood sugar levels instead.
Explanation:
What is the monomer that’s makes up polysaccharides
Answer:
glucose
Explanation:
Polysaccharides are long chains of monosaccharides linked by glycosidic bonds. Three important polysaccharides, starch, glycogen, and cellulose, are composed of glucose. Starch and glycogen serve as short-term energy stores in plants and animals, respectively. The glucose monomers are linked by α glycosidic bonds.
Atmospheric nitrogen can be fixed by nitrogen-fixing bacteria. Arrange the following forms of nitrogen from the atmospheric N stage to the final form that enters the roots. 1. Ammonia 2. Nitrogen gas 3. Ammonium ion 4. Nitrite 5. Nitrate
Answer:the answer is ammonia
Explanation:the nitrogen fixing bacteria fix the nitrogen as ammonia
Scientists want to track the wind speeds and precipitation for a hurricane that will affect the entire East Coast of the United States. Which weather equipment would be best to measure the impact of the storm for this entire region? A. an anemometer B. a rain gauge C. Doppler Radar D. global positioning system (GPS)
Answer:
A anemometer an instrument for measuring the speed of the wind, or of any current of gas.
GPS is to see where you on on the earth so this is a no.
rain gauge only shows the amount of rain so this is a no
Doppler radar determine's the location and velocity of a storm, clouds, precipitation. So therefore, this is your answer.
Explanation:
Common symptoms of iron-deficiency anemia include muscle weakness, shortness of breath, and lightheartedness. Why does iron deficiency cause these symptoms?
Answer:lack of blood flow and blood concentration
Explanation:
The data collected from an experiment shows that as the temperature outside goes up, the number of swimmers at the local pool
goes up. This data shows a/an
Select one:
O a direct relationship
b. indirect relationship
c. inverse relationship
O d. no relationship
Answer:
The goal of disinfection of public water supplies is the elimination of the pathogens that are responsible for waterborne diseases. The transmission of diseases such as typhoid and paratyphoid fevers, cholera, salmonellosis, and shigellosis can be controlled with treatments that substantially reduce the total number of viable microorganisms in the water.
While the concentration of organisms in drinking water after effective disinfection may be exceedingly small, sterilization (i.e., killing all the microbes present) is not attempted. Sterilization is not only impractical, it cannot be maintained in the distribution system. Assessment of the reduction in microbes that is sufficient to protect against the transmission of pathogens in water is discussed below.
Chlorination is the most widely used method for disinfecting water supplies in the United States. The near universal adoption of this method can be attributed to its convenience and to its highly satisfactory performance as a disinfectant, which has been established by decades of use. It has been so successful that freedom from epidemics of waterborne diseases is now virtually taken for granted. As stated in Drinking Water and Health (National Academy of Sciences, 1977), "chlorination is the standard of disinfection against which others are compared."
However, the discovery that chlorination can result in the formation of trihalomethanes (THM's) and other halogenated hydrocarbons has prompted the reexamination of available disinfection methodology to determine alternative agents or procedures (Morris, 1975).
The method of choice for disinfecting water for human consumption depends on a variety of factors (Symons et al., 1977). These include:
its efficacy against waterborne pathogens (bacteria, viruses, protozoa, and helminths);
the accuracy with which the process can be monitored and controlled;
its ability to produce a residual that provides an added measure of protection against possible posttreatment contamination resulting from faults in the distribution system;
the aesthetic quality of the treated water; and
the availability of the technology for the adoption of the method on the scale that is required for public water supplies.
Economic factors will also play a part in the final decision; however, this study is confined to a discussion of the five factors listed above as they apply to various disinfectants.
The propensity of various disinfection methods to produce by-products having effects on health (other than those relating to the control of infectious diseases) and the possibility of eliminating or avoiding these undesirable by-products are also important factors to be weighed when making the final decisions about overall suitability of methods to disinfect drinking water. The subcommittee has not attempted to deal with these problems since the chemistry of disinfectants in water and the toxicology of expected by-products have been studied by other subcommittees of the Safe Drinking Water Committee, whose reports appear in Chapter III of this volume (Chemistry) and Chapter IV (Toxicity) of Drinking Water and Health, Vol. 3.
Organization of the Study
The general considerations noted in the immediately following material should be borne in mind when considering each method of disinfection. Available information on the obvious major candidates for drinking water disinfection—chlorine, ozone, chlorine dioxide, iodine, and bromine—is then evaluated for each method individually in the following sections. Other less obvious possibilities are also examined to see if they have been overlooked unjustly in previous studies or if it might be profitable to conduct further experimentation on them. Disinfection by chloramines is dealt with in parallel with that effected by chlorine because of the close relationship the former has to chlorine disinfection under conditions that might normally be encountered in drinking water treatment.
Imagine an invertebrate that lives in an estuary where salinity varies cyclically with the tides. If this individual is able to adjust the salt concentration of its body fluids, its salt concentration will have:____. a. a cyclic variation depending upon when the animal drinks. b. regular variations that range from large to small. c. slight fluctuations that are kept within a narrow range. d. a cyclic variation opposite that of the surrounding water.
Answer: Option C.
slight fluctuations that are kept within a narrow range.
Explanation:
An invertebrate that lives in an estuary where salinity varies cyclically with the tides. If this individual is able to adjust the salt concentration of its body fluids, its salt concentration will have slight fluctuations that are kept within a narrow range so has to maintain homeostasis and prevent the cells of the the invertebrate from not shrinking which can be due to the salt solution (Hypertonic).
Estuary is an area of water or shorelines where river meet the ocean. It normal do have concentration of salts. Organisms that live in estuaries must be able to adapt to their dynamic environments, wich is due to variations in water chemistry includes salinity, as well as physical changes like the rise and fall of tides.
Which ecosystem service would suffer from the opening of a mineral mine along a small mountain range?
A. Cultural
B. Provisioning
C. Regulating
D. Supporting
Answer:
D. Supporting
Explanation:
Ecosystem services include provisioning, regulating, culture and supporting services.
Opening of a mineral mine along a small mountain range will affect the supporting services of ecosystem because supporting services deals with soil formation, provision of habitat and nutrition cycle.
Opening of mineral mine will destroy the tosoil, landscape, forests and wildlife of mountain area which affect the supporting services such as habitat and soil formation.
Hence, the correct answer is "D. supporting".
why aphids are mostly found in the daytime ?
Answer:
When daytime high temperatures are between 90 degrees Fahrenheit
You are conducting research into the effects of certain chemicals being dumped into lakes on the populations living in the lakes. Which of the following metrics is NOT used to measure populations? A. The growth rate of the population B. The density of the population C. The rate of food consumption of the population D. The size of the population
Answer:
B. The density of the population.
Explanation:
Plants respond to changes in their environment. They detect gravity, light, touch, and seasonal changes, and respond to these stimuli in many ways. Which statement best explains this flexibility in response? A) Phenotypes are controlled by one gene that codes for multiple regulatory proteins. B) The genes that regulate plant responses can be expressed in different ways. C) The genes that regulate plant responses can mutate to adjust to environmental changes. D) Phenotypes control the genotypes of individuals, determining plant responses.
Answer:
B)
Explanation:
Plants have the ability to detect the changes in their environment and respond accordingly. Plants' responses to stimuli is due to the genes that regulate plant responses can be expressed in different ways.
Genes code for hormones and support transport of hormonal synthesis in plants. Plants hormone such as auxin promotes different changes in plant growth in response to light, gravity, touch or seasonal changes and the auxin respond due to transport inhibitor response 2 gene.
Hence, the correct answer is "B".
Determine whether each of the following is a characteristic of DNA, RNA, or both.
Is single-stranded:
Contains nitrogenous bases:
Contains uracil:
Contains adenine:
Is double-stranded:
Is made of nucleotides:
Contains deoxyribose sugar:
DONE
Answer:
Both DNA and RNA are made from nucleotides, each containing a five-carbon sugar backbone, a phosphate group, and a nitrogen base. DNA provides the code for the cell's activities, while RNA converts that code into proteins to carry out cellular functions.
