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Which two scientists used x-ray diffraction to try to determine the 3-dimensional structure of DNA?
Answer:
The discovery of the Double Dna Helix was done by Watson and Crick.
Answer:
Chargaff's realization that A = T and C = G, combined with the vital work of X-ray crystallography by English researchers Rosalind Franklin and Maurice Wilkins, contributed to the discovery of Watson and Crick a three-dimensional, two-helical DNA model.
Explanation:
When warm air exists above cold air, thereby trapping the cold air, this is referred to as a __________
Question 2 options:
Altitude inversion
Temperature inversion
Convection cell
Heat gradient
Answer:
I think it's temperature inversion
But not sure....
Answer:
temperature inversion
I WILL MARK BRAINLIEST
Answer:
A) Fossil Fuels, Minerals
Have a nice day!
Answer:
i think the answer is Minerals
1. Cells don't use the energy in glucose directly. What do they need to do? Why do they need to do this?
2. What is Cellular Respiration?
3. How many ATP molecules are released from one glucose molecule that undergoes cellular respiration?
4. How can you sum up the overall process of cellular respiration?
Answer:
for 1 they preserve the energy for later use
that's all I know sos
Ferns have vascular tissue, an adaptation to life on land, but they have an ancestral reproductive trait that tends to limit them to moist habitats. What is it?
Answer:
The correct answer is - flagellated sperm.
Explanation:
In ancestral trait that is flagellated sperm in ferns that were limited to moist habitat has sperms that must swim to the eggs. This is why ferns often require splashing water for the movement of sperm to points near female gametangia during reproduction.
Fern now adapted the vascular system to get life on the life and they are not limited to the water bodies, however, flagellated sperm is the ancestral reproductive trait.
What are the 2 jobs of DNA polymerase?
Answer:
Forms new strands of DNA and forms bonds between nucleotides it also has proofreading abilities
Which of the following could be reasons why population sizes may reach and maintain plateaus? Select the three (3) that apply.
fewer deaths
limits in food supply
competition with other species
increased birth rates
competition for space
major storms
Answer:
the answers are a, b, and ,d
The following could be reasons why population sizes may reach and maintain plateaus are fewer deaths, limits in food supply and increased birth rates.
What is the relationship between natural selection and population?Natural selection can cause microevolution (change in allele frequency), which causes fitness-enhancing alleles to become more common in the population. Fitness is a measure of reproductive success (how many offspring an organism leaves for the next generation, relative to others in the group).
Another factor that limits the growth of populations is densification. This means that a large number of individuals present at the same time in the same area reduces the availability of resources for the population as a whole, increasing the mortality rate and reducing reproductive success.
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What type of bonds are found between the nitrogen bases?
A. Hydrogen bonds
B. covalent bonds
C. peptide bonds
Answer:
A. Hydrogen bonds
Explanation:
The nitrogen bases are held together by hydrogen bonds.
Using the words "selection pressure" and "fitness", explain how natural selection causes populations to change over time.
Answer:
Environment and competition is the leading cause of evolution. It's an instinct to want to live, but trying to survive is difficult when other animals have the same goal. An ecosystem is a cycle, but every generation of this ecosystem slightly changes, and so do the animals. Every bug that has fitness can start overpopulating the ecosystem, leading to a surge of resources for what preys on the bug. Now bird's population goes up, so do other animal populations. Or the bug becomes an invasive species, and birds are being hunted too often to decrease the population.
In a different scenario, bugs are evolving because of the selection pressure that the environment is giving them. The birds have become better over the generation, and now have a more suited beak to catch the bug off the ground. The bug population maybe be decreasing, but the ones who live through the crisis are populating with bugs that certain gene that helped them out. But it's not over, the bug population isn't declining but it wasn't as big as it was before. The bird will find more ways to find and capture the bugs. But then bugs will keep surviving through the selection pressure and become much harder to find since they figured out camouflage. The bug that was neon yellow was dying since they were easy to see. Now they can range from green to black to hide in the environment. Now the birds are facing the selection pressure, it's a cycle.
(look, im not good at gammar, so you should get this looked at before entering it. I put it through gammarly if that helps.
The majority of nitrogen fixation happens when _____ converts atmospheric nitrogen(N2) into ammonia(NH3).
1. Fungi
2. Plants
3. Bacteria
Answer:
3.bacteria
Explanation:
The majority of nitrogen fixation happens when bacteria converts atmospheric nitrogen(N2) into ammonia(NH3).
hope it is helpful to you
The majority of nitrogen fixation happens when bacteria convert atmospheric nitrogen (N2) into ammonia (NH3). Bacteria live in symbiotic associations such as Rhizobium, but some live freely and fix nitrogen.
How is atmospheric nitrogen fixed?The atmospheric nitrogen is fixed by bacteria, which convert the atmospheric nitrogen into ammonia. There are many bacteria involved in this process.
Some bacteria live in symbiotic relationships with the roots of legume plants and capture nitrogen. Example: Rhizobium converts the nitrogen into ammonia, and the nitrogen enters living creatures when they eat the legumes. The leguminous plant makes the soil more fertile due to this process.
This process is aided by bacteria such as Azotobacter and Clostridium. Azotobacter is an aerobic bacteria, while Clostridium is an anaerobic one. The nitrogen is important for living organisms, as nitrogen is important for DNA, RNA, and protein synthesis.
Hence, Bacteria is the correct answer, as bacteria convert the atmospheric nitrogen (N2) into ammonia (NH3). option 3 is correct.
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The chart lists coordinates that describe the locations of
four cities.
City
Location
Kinshasa, Democratic Republic of the Congo 4° S/15° E
Addis Ababa, Ethiopia
9°N/39°E
Lagos, Nigeria
6°N/3° E
Oran, Algeria
35° N/0°W
Which city listed in the chart is farthest south?
Answer:
c.
Explanation:
i took the test
North Carolina has more wind off its shore than any other Atlantic Coast state. How could this resource be best utilized to reduce carbon emissions and provide cleaner energy for the state?
Answer:
C. Offshore wind farms could be constructed to generate wind energy, which reduces fossil fuel use throughout the state.
Explanation:
Option C is the correct answer.
Actually, wind energy is another alternative to fossil fuel. If North Carolina has more wind off its shore, then it is best to utilize it to reduce carbon emissions. It will help produce cleaner energy for the state.
So, the best way it can be utilized to reduce carbon emission is by constructing offshore wind farms in order to generate wind energy. This wind energy will help to reduce fossil fuel emissions.
Answer:
C. Offshore wind farms could be constructed to generate wind energy, which reduces fossil fuel use throughout the state.
Explanation:
Wind power is an excellent option for North Carolina homes, farms, businesses, schools, and utilities interested in producing clean, independent electricity.
Which type of selection occurs when a population experiences a shift in diversity toward the larger organisms?
stabilizing selection
directional selection
disruptive selection
adaptive selection
Answer:
Directional selection
Explanation:
When a population experiences a shift in diversity toward the larger organisms, it is directional selection.
What is directional selection?The term directional selection has to do with a type of selection in which the specie tend towards one side of the population mean.
Therefore, when a population experiences a shift in diversity toward the larger organisms, it is directional selection.
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Is an adaptation on one organism necessarily useful on another? Explain with examples.
Answer:
Do you mean one organisms offspring or same species?
You are part of a research group experimenting with signaling molecules that would tell cancer cells to stop dividing. The cancer cells have inactive receptors on their plasma membrane so you need an alternate method of getting the signals into the cells. What could you use?
A. Plasmodesmata for direct contact.
B. Stimulate the pituitary gland to send the signal as a hormone.
C. Gap junctions for direct contact.
D. Through the synaptic cleft of a neuron.
Answer:
b
Explanation:
how does the muscular system help the body maintain homeostasis? if it doesn't function correctly how does it affect the body?
Answer:
Skeletal muscles contribute to maintaining temperature homeostasis in the body by generating heat. Muscle contraction requires energy and produces heat as a byproduct of metabolism.
Explanation:
hope this helps
the process of __________ is responsible for healing the damaged or worn out cells in our body. (pls answer fast!!)
Answer:
Mitosis
Explanation:
Mitosis is the process in which new cells are formed from older ones by equational division in which ploidy of the cell (chromosome number) remains the same.
which of the following is the best definition of Technology?
A. the most recent electronic devices.
B. The scientific process
C. The pursuit of scientific knowledge.
D. Practice applications of scientific knoledge.
Answer:
I believe its D, technology is to make life easier with new resources, so using that definition, I think that D falls under it
Explanation:
The best definition of technology is the practice applications of the scientific knowledge. The correct option is D.
What is Technology?Technology involves the practical use of scientific knowledge to create tools, machines, and systems that improve our lives and solve problems. It is not limited to just electronic devices, but encompasses a wide range of fields including engineering, medicine, and agriculture.
Technology is the means through which we put scientific knowledge to use. It encompasses both tools (like computers) and methods (like how we make computer chips), as well as both. Although the majority of contemporary technology is electronic, this does not mean that all technology is.
While the pursuit of scientific knowledge is important, it is the application of that knowledge that defines technology.
Therefore, the correct option is D.
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What information can a scientist learn directly from a single fossil? O A. What the organism looked like B. How the organism is related to organisms on Earth today C. How many offspring the organism produced D. How long the organism lived
Answer:
A. What the organism looked like.
Explanation:
From a single fossil you can see what the organism looked like, but you need more than one fossil to know how long it lived. You can't determine how many offspring an organism produced from any fossil. And how the organism is related to organisms on earth today can be learned indirectly from fossils, using other information and technology.
Two students are making models of
cells in plants and animals. They
choose an expanding and shrinking
rubber band to show how one type of
cell acts. Which type of cell does the
A
rubber band best model?
O A. Muscle cells
O B. Epithelial cells
O C. Dermal cells
O D. Guard cells
O E. Nerve cells
HINT
SUBMIT
Answer:
A. Muscle cell because muscle are actualy the most attractive cells in the body most especially men/boyz
Type the correct answer in each box. Use numerals instead of words. If necessary, use / for the fraction bar.
The following chemical equation shows the combustion of ethane. Balance the equation by filling in the coefficients.
C2H6 +
O2 →
CO2 +
H2O
Answer:
2,7. 4,6
Explanation:
2 C2H6. +. 7O2. ==. 4. CO2. +. 6 H2O
Note. In such questions balance C first then H and finally O
It will be easier
can someone please answer this lol
Answer:
C: Fewer nesting sites
Explanation:
Người ta có thể tạo ra những cơ thể mới có kg khác với dạng bố mẹ sẵn có. Em hãy đề xuất 4 cách để tạo ra cá thể như vậy
Answer:
plz ask questions in English
What do you think selectively permeable means?
A. The membrane lets nothing in or out.
B. The membrane lets certain substances move across it freely, while others must move through a “gate”.
C. The membrane lets everything in and out.
Answer:
B. The membrane lets certain substances move across it freely, while others must move through a “gate”.
Explanation:
Selective permeability is a property of cellular membranes that only allows certain molecules to enter or exit the cell. This is important for the cell to maintain its internal order irrespective of the changes to the environment. For example, water, ions, glucose and carbon dioxide may need to be imported or exported from the cell depending on its metabolic activity. Similarly, signaling molecules may need to enter the cell and proteins may need to be released into the extracellular matrix. The presence of a selectively permeable membrane allows the cell to exercise control over the quantum, timing and rate of movement of these molecules.
B. The membrane lets certain substances move across it freely, while others must move through a “gate”.
Which of the following statements is not an example of evolution that has resulted from human activity? Group of answer choices Some insect species are now resistant to pesticides. Many strains of bacteria are now resistant to some commonly used antibiotics. Like certain other crops, domesticated strawberries are larger than wild strawberries. Because of hunting, organisms such as bears and wolves are fewer in number.
Answer:
The correct answer is - Because of hunting, organisms such as bears and wolves are fewer in number.
Explanation:
Evolution is the change in the characteristics or traits of the species that are developed over several generations by the process called natural selection. Natural selection is the process of transferring the genes or traits that help in the survival of organisms.
Among the given statements all the are the example of the evolution that is resulted from human activity except the extinction or fewer the bears and wolves due to hunting. Other examples are showing evolution as they developed characteristics over generations.
Which thesis statement best suits this persuasive excerpt ?
Smoking Doesn’t Just Hurt Your Health
(excerpt)
The arguments about smoking are usually centered around its effects on the health of smokers and nonsmokers alike. Entire ad campaigns have been developed around the idea of educating smokers about the risk that smoking poses to their health. Chances are you’ve encountered the photo of that diseased lung in your health class. Lawsuits against tobacco companies have gained a lot of media attention. Cities have gone so far as to ban smoking inside buildings, restaurants, and bars. But have you ever stopped to think about what smoking does to the environment?
It is easy to guess that smoking might pollute the air. Did you know that tobacco smoke contains more than 4,000 chemicals? Fifty of those chemicals are known to cause cancer, and two hundred are known poisons. Think about the fact that 20 percent of Americans smoke. Can you imagine how many chemicals are released into the air each year?
Cigarettes also account for an estimated 1.7 billion pounds of trash each year. Some people say the ban on smoking indoors in some cities could contribute negatively to this statistic. Because people are smoking outside, the number of cigarette butts they leave behind may increase dramatically.
A.
Smoking pollutes the air in public places, such as buildings, restaurants, and bars.
B.
Smoking not only produces negative effects on human health but also on the environment.
C.
Smoking damages the environment more severely than it damages human health.
D.
Smoking increases water pollution when cigarette butts are dumped into waterways.
E.
Smoking harms wild animals by polluting and destroying their natural habitats.
Answer: B. Smoking not only produces negative effects on human health but also on the environment.
Smoking not only produces negative effects on human health but also on the environment is best suited thesis statement to this persuasive excerpt.
How smoking effects our body?
Smoking causes lung disease, pulmonary disease, emphysema, diabetes or many more problems.It might be cause throat cancer or mouth cancer. Cigarette have tobacco, carbon monodioxide, benzene, nicotine, formaldehyde types of chemicals which are extreme harmful for body as well as environment.
Smoking is harmful for body as well as environment. Tobacco smoke contains more than 4,000 chemicals. Fifty of those chemicals are known to cause cancer, and two hundred are known poisons. These all are spread over in air and that air intake by the non smokers.
Cigarettes also account for an estimated 1.7 billion pounds of trash each year, so it produces the pollution in air dramatically.
Hence, option 'C' is correct.
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Where is the DNA found in Eukaryotic cells?
A. nucleus
B. rough ER
C. mitochondria
Answer:
A NUCLEUS
Explanation:
Answer:
A. nucleus
Explanation:
The DNA is found in the nucleus of the Eukaryotic cells.
A cell that utilizes NHEJ to repair a double-stranded DNA break which occurred in the open reading frame of a gene is susceptible to indels resulting in a frame shift mutation and ultimately a non-functional protein. False True
Answer:
True
Explanation:
The non-homologous end-joining (NHEJ) pathway is a DNA repair pathway used to repair double-strand breaks that can occur throughout all cell cycle phases. Conversely to the homologous recombination (HR) pathway, the NHEJ pathway does not need a homologous template at the DNA double-strand breaks ends and therefore NHEJ is an error-prone repair pathway that may cause mutations within the repaired region of the DNA. The NHEJ pathway is well-known to induce indels (i.e., insertions and deletions) mutations that shift the reading frame of the protein (i.e., frameshift mutations), thereby leading to a completely different translated protein from the original one.
Leukemia is a type of cancer that prevents a person from being able to make new blood cells. What part of the body develops this kind of cancer? O A. Kidney O B. Brain O C. Liver O D. Bone marrow SUBMIT PREVIOUS.
Answer:
D. Bone
Explanation:
Leukemia, a type of cancer found in your blood and bone marrow, is caused by the rapid production of abnormal white blood cells. The high number of abnormal white blood cells are not able to fight infection, and they impair the ability of the bone marrow to produce red blood cells and platelets.
I’ll mark as brainliest pls help!
Answer:
the answer should be rrxrr
Explanation:
a wrinkled pod is a recessive trait which is represented by "r"
