Answer:
(C) DNA
Explanation:
This experiment shows that when bacteriophage infects bacteria, it only inserts its DNA (radioactive phosphorus is incorporated only in nucleic acid, while radioactive sulfur is incorporated only in proteins). Proteins with incorporated sulfur are located within the capsid of bacteriophage, which stays outside the bacterial cell.
A zebra mussel is discovered in a lake in Pennsylvania for the first time. Why would this make an ecologist worried?
A. Zebra mussels need to live in hot-water environments.
B. Zebra mussels are vulnerable to many predators in that lake.
C. Zebra mussels need to live in salt-water environments and it will hurt the organism.
D. Zebra mussels are an invasive species that can completely disrupt an ecosystem
Answer:
D
Explanation:
Zebra mussels can be a nuisance in novel ecosystems. When introduced in a non-native ecosystem with no natural predators, they reproduce rapidly displacing native mussels. Zebra mussels take up much of the algar that feeds the other native species hence starving them to death and causing their numbers to plummet. In addition, they attach to the other mussels and clog up power plants, that use the local water, water intakes.
Answer:
D. Zebra mussels are an invasive species that can completely disrupt an ecosystem
Explanation:
What controls which dna is amplified in pcr?
Answer:
Primers
Explanation:
PCR or Polymerase Chain Reaction is in vitro techinque, widely used for production of DNA copies of a specific DNA region. The major components of this reaction are thermostable enzyme Taq polymerase and primers designed for specif region of DNA that is region of interest.
PCR reaction is repeatedly cycled through a series of temperature changes, and the purpose of it is to make as much amplified DNA sequences for further investigations.
In PCR, the DNA segment that gets amplified is controlled by the sequence of the primers. The thermocycler conducts temperature changes necessary for denaturing, annealing, and extending DNA. Post-PCR, products are checked via electrophoresis and careful practices are essential to prevent contamination.
The process that controls which DNA is amplified in PCR (Polymerase Chain Reaction) is primarily determined by the sequence of the primers used in the reaction. These primers are short pieces of DNA that are designed to be complementary to the specific regions of the template DNA that one intends to amplify. Therefore, by controlling the primers' sequences, experimenters can target exactly what segment of DNA is replicated.
During PCR, thermal cycling is employed to change temperatures in a way that facilitates the replication process. The thermocycler machine is responsible for raising and lowering the temperatures for denaturing the DNA, annealing the primers, and extending the new DNA strands. Each of these steps occurs at a different temperature, with the entire amplification process being completed rapidly.
Post-amplification, the PCR product is typically checked on an electrophoretic gel to confirm the successful amplification of DNA of the expected size. PCR not only allows for selective replication of a specific DNA segment but also requires stringent practices to avoid contamination, which can greatly affect the results due to the high sensitivity and amplification capabilities of PCR.
Recently, ruth has difficulty lifting her feet to climb steps. sometimes her hands tremble when she's drinking her afternoon cup of tea. which neurocognitive disorder is she likely suffering from
Answer:she gon die
Explanation:
The animals found in australia who carry their young in pouches are collectively known as _______________.
The animals found in australia who carry their young in pouches are collectively known as marsupials .
Answer: marsupials
Which of the following parts in the human body cannot be infected by a virus? a) none of the above, as they can all be infected by virusesb) blood cellsc) braind) skeletal muscle
a) none of the above, as they can all be infected by viruses.
On Earth, animals were sorted out by classification. There were many kingdoms that defined whom they were. Which of the following is the most generic classification for animals?
Population
Group
Genus
Species
Answer: Genus
Explanation:
We can automatically cross out "Population" and "Group" because both are not part of the classification system. Species is more specific, so our only answer would be Genus.
Hope this helps ya :D
What will most likely happen if a new producer is introduced into a food web? A) The omnivores will decrease. B) The herbivores will increase. C) The carnivores will decrease. D) The decomposers will decrease
B) the Herbivores will increase
Which does not increase blood pressure? increased venous return. increased total blood vessel length. increased heart rate. increased parasympathetic impulses. decreased blood vessel radius?
Answer:
The answer is definitely increase heart rate
Explanation:
This cold river of air travels from west to east in the northern hemisphere. Last winter, it dipped far south to bring cold air and snow to many southern states. This is the A) Hadley wind. B) polar jet stream. C) Arctic jet stream. D) tropical jet stream.
Answer: The answer is polar jet stream because the polar jet stream dips low over the Northern United States during the winter to bring cold air. In the summer, the jet stream retreats and brings cool air to the Northern United States.
Explanation:
In which direction does Earth rotate?
eastward around its axis
in an ellipse around the Sun
counterclockwise around the Sun
from north to south around its axis
What force acts between Earth and the moon?
gravity
mass
motion
newtons
Answer:
The answer is its eastward around its axis
Explanation:
What is the gel-like fluid that fills the cell and surrounds the organelles?
Chloroplast
Cytoplasm
Mitochondria
Ribosome
Answer:
Cytoplasm!!
Explanation:
The gel-like substance that fills a cell and surrounds the organelles is known as the cytoplasm. It primarily contains water, along with various molecules and ions required for cellular activities, housing the organelles within it.
Explanation:The gel-like fluid that fills the cell and surrounds the organelles is called the cytoplasm. The cytoplasm is majorly made up of water and also contains various molecules and ions needed for the cell functions. Organelles such as the mitochondria, ribosomes, and others, are suspended in the cytoplasm and perform their functions there. It's important to note that cytoplasm is not one of the organelles, but the medium in which they reside and operate. Therefore, the cytoplasm is popularly described as the 'backdrop' or 'stage' upon which the 'actors' (organelles) carry out their roles.
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What is the first thing to occur in dna replication?
Which of the following does NOT occur during the Calvin cycle?carbon fixationconsumption of ATPrelease of oxygenoxidation of NADPHregeneration of the CO2 acceptor
I’m fairly sure it’s the last choice. I hope I was helpful
Which of the following statements about aldosterone is NOT correct?
A. Aldosterone increases the number of passive sodium channels in the luminal membrane of the distal tubule and collecting duct, thus aiding sodium reabsorption.
B. Aldosterone is produced in the adrenal cortex.
C. Aldosterone increases sodium reabsorption by increasing the number of Na+-K+ ATPase pumps in the luminal membrane of the proximal tubule.
D. Aldosterone is stimulated by decreased plasma sodium levels and increased plasma potassium levels.
Answer:
C. Aldosterone increases sodium reabsorption by increasing the number of Na+-K+ ATPase pumps in the luminal membrane of the proximal tubule.
Explanation:
Aldosterone hormone is produced by the adrenal gland and mainly carries out its functions in the kidney.Through the aldosterone hormone the body is able to retain more water for the kidney is able to hold more sodium.When the plasma sodium levels decrease and the plasma potassium levels increase the production of aldosterone hormone is stimulated for sodium is needed in the .body to maintain the high water levels in the body.The incorrect statement about aldosterone is C. Aldosterone increases sodium reabsorption by increasing the number of Na+-K+ ATPase pumps in the luminal membrane of the proximal tubule. Aldosterone works primarily in the distal tubules and collecting ducts, not the proximal tubule.
Explanation:The statement about aldosterone that is NOT correct is: C. Aldosterone increases sodium reabsorption by increasing the number of Na+-K+ ATPase pumps in the luminal membrane of the proximal tubule. This is incorrect because aldosterone increases the reabsorption of sodium primarily in the distal tubules and collecting ducts of the nephron, not the proximal tubule. Its impact is through the upregulation of sodium channels and pumps at these locations, facilitating more sodium to be reabsorbed back into the bloodstream to increase sodium and water retention, and therefore increase blood volume and blood pressure. It is produced in the adrenal cortex (Statement B is correct), and is indeed stimulated by decreased plasma sodium levels and increased plasma potassium levels (Statement D is correct).
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A byproduct of amino acid catabolism in the liver is
Answer:
B. Urea
Explanation:
Urea is a byproduct of amino acid catabolism in the liver.Excess amino acids undergoes the process of deamination in the liver. During the process of deamination, the amino acids are broken down into amine group and a carboxyl group.The amine group is then reduced to ammonia by addition of a hydrogen atom while the carboxyl group or the non-nitrogenous part is converted to fats or carbohydrates. Ammonia is then removed from the body in form of urea.The principal byproduct of amino acid catabolism in the liver is urea, which is formed from the ammonia generated during the transamination process and subsequently excreted in urine.
Explanation:A byproduct of amino acid catabolism in the liver is urea. During the breakdown of amino acids, the liver plays a crucial role in removing the amino group from amino acids in a process called transamination. This amino group is eventually converted into ammonia, which is toxic to the body. To safely excrete this ammonia, the liver synthesizes urea, combining two ammonia molecules with a carbon dioxide molecule. Urea is then eliminated from the body through urine, making it the principal waste product of amino acid catabolism in mammals.
The liver is not the only organ involved; tissues such as the kidney, small intestine, muscles, and adipose tissue also participate in amino acid metabolism. When glucose levels are low, such as during fasting or starvation, amino acids are more likely to undergo catabolism, with their carbon skeletons being utilized for energy production through the citric acid cycle.
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One function of _____ tissue is to hold organs and other tissue in place. epithelial connective nervous muscular
Answer:
connective
Explanation:
a key term is "connect" it hold it together with this
hope this helps : )
Connective tissue is the correct answer
The base of the pyramid is built from organisms that primarily A) are autotrophs. B) are heterotrophs. C) consume organisms located above them.
The base of the pyramid is built from organisms that primarily are autographs.Answer: A
Which of the following substances contain nucleotides made up of a sugar, phosphate, and a nitrogen base?
DNA
RNA
Both DNA and RNA
Neither DNA nor RNA
Which of the following is single-stranded, found throughout the cell, and has the bases A, C, U, and G?
DNA
RNA
Both DNA and RNA
Neither DNA nor RNA
The sequence of amino acids effects which of the following
the amount of cytoplasm
the number of proteins
the size of the ribosomes
the shape of the protein
Answer:
i) The substances that nucleotides that are made up of sugar, phosphates and a nitrogen base are both DNA and RNA. Both are composed of a carbon ringed structure that is a sugar base with the only difference of -OH group that is absent in DNA and present in RNA, to this carbon ring phosphate diester bond helps in the attachment of nucleotide monomers, and nitrogenous base is attached to the ring at one of the carbon.
ii) RNA is single-stranded structure that is found thought the cell and has bases A, C, U and G. It can't be DNA, because DNA is double stranded helix with adenine, guanine, cytosine and thymine as their bases uracil is not present in DNA. The sugar of DNA lacks the hydroxyl group at 2' position of carbon atom. Both DNA and RNA has a base of a sugar, to which one of the four nitrogenous base is attached and one or two phosphate groups are attached.
iii) The shape of protein is effected by the sequence of amino acids. As through the central dogma of transcription and translation lead to the formation of proteins, any change in the gene would mislead to the production of transcript RNA, this mutated RNA will result in the formation of mutated proteins with change in one or more amino acids. Change in a single amino acid will lead to change in the shape or structure of protein that would ultimately change the function of that protein.
In lacI —mutant cells, when there are high levels of glucose present but no lactose, how much β-galactosidase will be produced? See Section 18.2 (Page 371) . View Available Hint(s) In lacI —mutant cells, when there are high levels of glucose present but no lactose, how much β-galactosidase will be produced? See Section 18.2 (Page 371) . A low amount A great deal It depends on what other sugars are present in the growth medium. Essentially none
In lacI mutant cells with high glucose and no lactose, essentially no β-galactosidase is produced due to the absence of lactose to inactivate the dysfunctional repressor and the presence of glucose which keeps cAMP levels low, resulting in inactivity of the CAP.
In lacI —mutant cells, when high levels of glucose are present and no lactose is available, essentially no β-galactosidase will be produced. This is due to the fact that the lac repressor in a lacI mutant is non-functional, and cannot properly respond to the presence of lactose. However, the presence of high glucose levels prevents the catabolite activator protein (CAP) from enhancing transcription at the lac operon. Essentially, in the absence of lactose, there is no inducer to inactivate the repressor and no β-galactosidase activity. Moreover, high glucose levels decrease the cyclic AMP (cAMP) levels, leading to an inactive CAP which cannot increase transcription of the lac operon. Thus, the concentration of β-galactosidase remains low or nonexistent.
A group of scientists believe that global warming is an irreversible process. Another group of scientists feel that human intervention can reverse the global warming process. Which of these is the most likely outcome of differences in opinions of scientists on the issue of global warming?
All old ideas would be discarded.
Scientific evidence would be weakened.
New ideas would be created and tested.
The limitations of science would be evident.
Answer:
C
Explanation:
Whenever researchers have conflicting opinions, they test their own hypothesis first to ensure it is possible. If neither options are possible then they simply create new ones.
Answer:
The correct answer will be option-New ideas would be created and tested.
Explanation:
The scientists use the scientific method to answer and explain any scientific question based on observations. These explanations must be verified with the peer review fellow scientists on the basis of which a consensus is established.
If two group of scientists on the same issue proposes different or contradictory explanations, then the groups should form new hypothesis to explain the phenomenon.
In the given question, the opinions of the two groups on global warming disagree with each other's explanations. These issues should be handled by forming a new hypothesis which could be tested again to reach a conclusion.
Thus, the selected option is the correct answer.
How do limiting factors impact local ecosystems?Limiting factors prevent populations in ecosystems from growing any larger. If any of the limiting factors change, animal and plant populations change, too.Limiting factors do not prevent populations in ecosystems from growing any larger. If any of the limiting factors change, animal and plant populations do not change, too.Limiting factors can never impact ecosystems.As biodiversity of an ecosystem increases, the ability to withstand environmental stress due to the loss of a single species or group also increases, improving the sustainability of the ecosystem.
Answer:
If any of the limiting factors change, animal and plant populations change, too.
Explanation:
it changes it's either it's increasing or the other way around. if it's not favourable organisms leave increasing the population of the other area.
If any of the limiting factors change, animal and plant populations change, too.
Explain how limiting factors change, animal and plant populations change?
it changes it's either it's increasing or the other way around.
if it's not favourable organisms leave increasing the population of the other area.
Thus, option "B" is correct, If any of the limiting factors change, animal and plant populations change, too.
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Which polysaccharide is an important component in the structure of many animals and fungi?
a. amylopectin
b. chitin
c. cellulose
d. amylose?
B. Chitin
that' because both animals and fungus are eukaryotic and heterotrophic, so they share same characterstics in terms of feeding and cellular structure. In addition to both share the same protist supergroup, which is (Unikonta).
Chitin is the polysaccharide that is significant in the structure of many animals and fungi, functioning mainly as a protective and supportive component in arthropods and fungi.
Option B is correct
Explanation:The polysaccharide that functions as a crucial component in the structure of many animals and fungi is chitin. This polysaccharide is mainly found in the exoskeleton of arthropods like insects, crabs, and spiders, as well as in the cell walls of fungi. Unlike the other polysaccharides mentioned in the options, chitin has a structural role in nature, helping to provide protection and support.
In contrast, amylopectin and amylose are both components of starch, a polysaccharide used by plants for energy storage. Cellulose, on the other hand, is a polysaccharide found in the cell walls of plants, helping to maintain their structure.
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Hershey and Chase set out to determine what molecule served as the unit of inheritance. They completed a series of experiments in which E. coli was infected by a T2 virus. Which molecular component of the T2 virus actually ended up inside the cell?A) proteinB) RNAC) ribosomeD) DNA
Answer:
The correct option is D.
Explanation:
In the year 1952, two scientists, Hershey and Chase conducted a series of experiments that helped to establish the fact that DNA is a genetic material. The DNA is located inside the nucleus of living cells in form of chromosomes and its the determinant of traits that are found in living organisms. During protein synthesis, the information in the DNA molecule is encoded into an RNA molecule and this is used in the production of protein, thus, DNA actually directs all the happen in the living cells.
Hershey and Chase conducted an experiment in 1952 that proved DNA is the molecule carrying genetic information. They demonstrated this by infecting E. coli cells with T2 bacteriophage - a virus - and discovered that only the DNA from the bacteriophage ended up inside the cells.
Explanation:The answer to your question lies in a series of experiments conducted by Alfred Hershey and Martha Chase in 1952. They were investigating the molecular component of the T2 bacteriophage, a type of virus, that ended up inside E. coli cells it infected.
Using two separate batches of phage, they used radioactive sulfur, ³⁵S, to label the protein coats of one batch, and radioactive phosphorus, ³²P, to label the DNA of the other batch. After infection, they separated the phage and cells and discovered that only the phage batch radiolabeled with ³²P ended up inside the bacterial cells. This confirmed that it was the DNA, not protein, that was injected into the cell and served as the genetic material.
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selling food locally increases sustainable use of the land because crops can be rotated more easily. what is another benefit of this practice?
Answer:
Less CO2 emitted from transportation
Explanation:
The other answer options don't make as much sense, since it would basically be from farm to table, answers B and D don't make sense. As for C, farmers would probably end up making more and if not the same, because they'd be able to directly sell a higher percentage of their yieldings from the crop because little to no transportation is required (less bruised or damaged goods) and the store or supermarket they sell it in wouldn't be taking a percentage of their earnings.
Another benefit of the particles is there is less CO2 emitted from transportation. Option A is correct.
What is selling food locally?When the farmers produce food, they sell the food to earn money. Farmers sell their food out in the city to get more prices. Selling food locally means selling the product in the same place where it grows.
Selling the food locally cuts the cost of vehicles, and also it's eco-friendly because greenhouse gases will be less emitted.
Thus, option A, There is less CO2 emitted from transportation, is correct.
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The options are attached to the image.
The mating strategy in which a female mates with multiple males is
Answer to this is Polygamy
A diagnosis of one type of cardiovascular disease does not necessarily indicate risk for another type true or false
Answer:
True
Explanation:
There are several cardiovascular issues which are caused due to varied reasons. Hence it is very essential to conduct different diagnosis to determine the exact cause of problem.
For instance -
Abnormal Heart Rhythms causes slowing or fastening of heart beat. There is no physical damage of any of the substructures of heart but there is lack in neural co-ordination.
On the other hand Aorta Disease and Marfan syndrome are caused due to widening or tearing of aorta.
Cardiomyopathy is the problem associated with heart muscle.
Different heart diseases are due to different factors and hence there must be individual diagnosis methods for all the cardiovascular issues.
Hence, the given statement is true
What is the correct order of processes involving the movement of oxygen from the environment to mitochondria in vertebrates?
Answer:
a.) ventilation, circulation, cellular respiration
Explanation:
a.) ventilation, circulation, cellular respiration
b.) diffusion in tissues, cellular respiration, diffusion at respiratory surface
c.) ventilation, diffusion in tissues, circulation
d.) circulation, cellular respiration, diffusion in tissues
e.) circulation, ventilation, cellular respiration
Ventilation occurs in the lungs and is the process by which carbon dioxide in the capillaries is lost to the environment while oxygen is taken in. Circulation is the process by which this dissolved oxygen is taken by the blood to tissues around the body. When this oxygen is taken to tissue, the concentration gradient allows the oxygen to be taken up by tissue. This oxygen is used as an electron acceptor (when it reduced to water) in the mitochondria during electron transport chain of cellular respiration.
please help
The cell membrane is important for maintaining ___________ because it controls what enters and leaves the cell.
shape
homeostasis
temperature
pressure
Answer: Homeostasis
Remember homeostasis is the tendency toward a relatively stable equilibrium between interdependent elements, especially as maintained by physiological processes. The cell membrane is providing an equilibrium inside and outside the cell. Hope this helped :)
What is the definition of a dihybrid cross?
Answer:
A dihybrid cross describes a mating experiment between two organisms that are identically hybrid for two traits. A hybrid organism is one that is heterozygous, which means that is carries two different alleles at a particular genetic position, or locus. hope this helps you
Explanation:
A Dihybrid cross is defined as a cross between 2 true-breeding parents that possess different forms of two genes.
What is Dihybrid?A dihybrid cross is defined as a mating experiment between two organisms that are alike hybrid for two traits. A hybrid organism is one that is heterozygous, which means that it carries two different alleles at a single genetic position or locus.For example color and the shape of seeds at a time they picked. He picked the wrinkled-green seed and round-yellow seed and meet them. He procures only round-yellow seeds in the F1 generation.Genetics is the offspring of two individuals that are unlike with respect to two pairs of genes.To learn more about dihybrid refer to:
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causes and effect (climate change)
Answer; green house effect because of the ozone layer deteriorating
Explanation:
Answer:
Climate change refers to the global changes in the climate, that are caused due to the changes that occur in terms of precipitation, wind pattern, surface temperature, and other climatic factors.
It is caused due to the increasing amount of greenhouse gases such as carbon dioxide, water vapor, methane and chlorofluorocarbon in the atmosphere that depletes the ozone layer. These gases are released from vehicles, industries, and factories. Deforestation also leads to an increasing amount of global surface temperature.
The effects of climate change are the increasing and decreasing amount of sea level, global rise and fall of surface temperature, as a result of which the ecosystem at various places are affected significantly.