Answer:
Nitrogen-fixing bacteria, microorganisms capable of transforming atmospheric nitrogen into fixed nitrogen.More than 90 percent of all nitrogen fixation is effected by these organisms, which thus play an important role in the nitrogen cycle.T or F The study of orthologs would be useful to determine the function of a specific gene in a species.
Answer:
True
explaination non
What will happen in the future if we keep on using our non-renewable resources?
The most well-known impact of using non-renewable energy sources is the emission of greenhouse gases such as carbondioxide gas etc.
What will happen if we continue to use non-renewable resources?We pursue to use of non-renewable resources, in specific, carbon dioxide and methane give to climate change. Different types of non-renewable energy fuels emit high levels of greenhouse gases.
Minerals is used for making metals which are also non-renewable natural resources. Nonrenewable natural resources take extended than a person's lifespan to be returned. In fact, Non-renewable energy can take millions of years to form. Fossil fuels such as oil, coal, and gas will not last forever.
So we can conclude that The problem with non-renewable energies is the ecological impact of non-renewable energies · The fuel of climate change.
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In chemistry, the elements are *
a. Pure chemical substances containing only one type of atom
b. Pure chemical substances containing two or more different types of atoms
c. Substances which can be burnt in the presence of air
d. Substances that do not react with other substances
A scientist is investigating the possibility that two traits in a particular plant are determined by genes that are on the same chromosome. The scientist crossed a plant that is homozygous dominant for both traits with a plant that is homozygous recessive for both traits. The heterozygous offspring in the Fl generation were then crossed with a plant that is homozygous recessive for both traits. The results expected if the genes independently assort and the observed results are presented in the table. Phenotype Expected Number in F2 Observed Number in F2 25 17 Long stems, white flowers Short stems, red flowers 25 19 Long stems, red flowers 25 31 25 33 Short stems, white flowers Total number of plants 100 100 Which of the following critical values should the scientist use for the chi-square analysis of the data? a. 3.00 b. 3.84 c. 7.81 d. 8.00
The critical value the scientist should use for the chi-square analysis of the data is b. 3.84.
THE CHI-SQUARE ANALYSIS OF THE DATAThe chi-square test is a statistical test used to determine whether there is a significant difference between the observed and expected frequencies in a contingency table. In this case, the scientist is investigating whether two traits in a plant, long stems and white flowers, are determined by genes that are on the same chromosome. The scientist has conducted a genetic cross between plants that are homozygous dominant and homozygous recessive for both traits, and has obtained a sample of 100 plants in the F2 generation. The scientist has then tabulated the observed and expected frequencies of the four possible phenotypes (long stems, white flowers; short stems, red flowers; long stems, red flowers; short stems, white flowers) in the F2 generation.
The chi-square test is used to determine whether there is a significant difference between the observed and expected frequencies in the table. The calculated chi-square value is compared to a critical value from a chi-square distribution table with 3 degrees of freedom and a significance level of 0.05. The degrees of freedom for a chi-square test are equal to the number of categories in the table minus 1. In this case, there are 4 categories (phenotypes) in the table, so the degrees of freedom are 3.
The critical value for this test is 3.84. If the calculated chi-square value is less than 3.84, the scientist would conclude that there is no significant difference between the observed and expected frequencies and thus the genes independently assort, meaning that the genes are located on different chromosomes. On the other hand, if the calculated chi-square value is greater than 3.84, the scientist would conclude that there is a significant difference between the observed and expected frequencies and thus the genes are located on the same chromosome.
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Phoebe and Jahiem are working together on an assignment on types of reproduction. They read an article about seedless orange trees. Farmers cut parts of the tree and plant them in the garden to make new trees. Jahiem and Phoebe made the following predictions: Phoebe: I think these trees reproduce asexually and rely on mitosis as there are no seeds to plant. So I predict that all orange trees will be genetically identical to each other and the parents. Jahiem: I think these trees reproduce sexually and depend on meiosis. Plants are multicellular organisms and all multicellular organisms reproduce through meiosis. So I predict that all orange trees will be genetically different from each other and the parents.
Determine who you agree with and explain your reasoning. Be sure to include at least two proofs in your explanation.
HEEEEEELP
Answer:
Technically, both are correct, but I would go with Jahiem.
Explanation:
In terms of how orange trees are normally produced, they usually reproduce asexually, but farmers will graft parts of trees to create new ones. But, normaly trees reproduce sexually.
Write down: An orange tree in the wild is not genetically similar to the one next to it
I agree with Phoebe that orange trees will be genetically identical to each other.
Predictions of PhoebeI think these trees reproduce rely on mitosis as there are no seeds to plant. So I predict that all orange trees will be genetically identical to each other and to their parents.
What are reproduction plants?In reproduction, the plant does not need another gamete to reproduce. For this type of reproduction, parts of the plant are removed to obtain new plants, which is known as a clone. Therefore, what is really used in this type of reproduction is the genetic material of the plant.
Whit this information, we can conclude that i agree with Phoebe that orange trees will be genetically identical to each other.
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In most cases, the two major climatic factors affecting the distribution of organisms in terrestrial ecosystems are __________. In most cases, the two major climatic factors affecting the distribution of organisms in terrestrial ecosystems are __________. temperature and sunlight predators and parasites competitors and predators precipitation and temperature wind and precipitation
Answer:
precipitation and temperature
Explanation:
Temperature and water are considered major abiotic factors that affect species distribution in terrestrial ecosystems. The temperature can affect the distribution of terrestrial organisms due to many species maintain a constant internal temperature, while other species maintain a body temperature range that may be very different from the environmental temperature, and therefore they will not be able to carry out their metabolic functions. Hibernation is an adaptation that allows some terrestrial animals to escape temperature fluctuations. Moreover, water is another limiting factor for life, since water is critical for cellular processes. The waxy cuticle is an adaptation that allows terrestrial plants to avoid excessive water loss through transpiration.
Which gender (male or female) is most likely to have X linked traits? _____
(Pls explain also)
How do clams oysters and snails protect themselves?
Organisms like clam, oysters and snails are all species of the phylum Mollusca who protect themselves from their enemies by hiding inside their shells.
Mollusca is the second largest phylum of the Animal kingdom that possess all invertebrate organisms. These are all aquatic organisms hat may be marine or freshwater resident. All the organisms of the phylum possess a solid shell that protects them.
Shells of the species of phylum Mollusca is a hard calcareous structure found on the external portion of the body. The main chemical component of the shell is calcium carbonate. Some animals have shell only on the upper side of the body while some have shells on both sides and are called bivalves.
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Gayla measured the temperature of two identical cups of water over three hours. One cup was kept in a dark cupboard. The other cup was kept under a lamp. Her data is shown in the table below.
Temperature of Water Over Time
Time
Passed Temperature of Water
In the Dark Under a Lamp
start 25°C 25°C
one hour 25°C 35°C
two hours 25°C 45°C
three hours 25°C 55°C
A good scientific explanation uses both the data and an interpretation of the data.
Which of the following is the best explanation for the results of this experiment?
A.
The light shining on the water was changed into heat energy, which increased the temperature of the water.
B.
The temperature of the water under the lamp increased, but the temperature of the water in the dark did not.
C.
The light energy turned into sound energy, which raised the temperature of the water.
D.
The temperature of the water increased because the air conditioner in the room was off.
Answer:
A: The light shining on the water was changed into heat energy, which increased the temperature of the water.
Explanation:
__________________________________________________
The best explanation for the results of Gayla's experiment is that the light shining on the water was changed into heat energy which increased the temperature of the water.
This explanation is not only based on the fact that the temperature of the water under the lamp increased and the temperature of the water in the dark did not, but it also explains how the light energy that came from the lamp changed into heat energy and warmed the water.
What two “parts” does a cell build ATP from?
Answer:
Explanation:
. The two ATP-producing processes can be viewed as glycolysis (the anaerobic part) followed by aerobic respiration
In cardiac muscle, the fast depolarization phase of the action potential is the result of
A) decreased membrane permeability to calcium ions.
B) increased membrane permeability to chloride ions.
C) increased membrane permeability to potassium ions.
D) decreased membrane permeability to sodium ions.
E) increased membrane permeability to sodium ions.
E) The increased membrane permeability to sodium ions causes the fast depolarization phase of the action potential in cardiac muscle.
In cardiac muscle cells, what causes the action potential's rapid depolarization phase?An opening of fast sodium channels initiates the depolarization phase of the action potential in muscle and nerve cells. This also occurs in cardiac cells that do not have pacing devices; However, the initial depolarization phase of the action potential is influenced by calcium ions in cardiac pacemaker cells.
What takes place during cardiac muscle depolarization?An electrocardiogram (EKG) is an indirect indicator of heart muscle contraction because contraction of the heart muscles is caused by depolarization of the heart. Without any external stimulus, the heart's cells will depolarize. Automaticity, or autorhythmicity, is the name given to this property of cardiac muscle tissue.
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Approximately how many plant made pharmaceuticals are currently under different stages of discovery?
a.
100
b.
200
c.
300
d.
400
PBS Evolution: Great Transformations
1. If the world’s history were compressed into one hour, how long have humans been here?
Microbes. Single-celled organisms
2. How long ago did mammals first appear on earth?
Mammals first appeared about 200 million years ago
3. What type of animal did the skull that Dr. Gingrich discovered resemble?
Dr. Gingrich discovered resembled a whale
4. What did "Whale Valley" used to be?
5. What unusual feature did they find at the end of the early tetrapods’ limbs?
6. How long ago did animals first appear on Earth?
About 800 million years.
7. When the mouse "eyeless" gene was implanted into the fruit flies, what happened?
8. How would walking on two legs be an advantage?
Humans have undergone evolutionary transitions, as mammals like whale resembled other mammals in terms of skulls and other sculptures on the basis of the fossils found.
The program begins with one of the most popular examples of a purported change used by the evolution contingency: the transition from land animals to the whale. This shift is demonstrated to be explained by the fossils of Pakicetus, Ambulocetus, Rhodocetus, Dorontid, and Basilosaurus. In contrast to a complete transitional fossil, Pakicetus only has a small piece of its cranium to show for itself. Although Ambulocetus is depicted in the documentary as a fully preserved fossil of an aquatic mammal with legs, this is an embellishment and stretching of the truth given that the skeleton of the animal was actually found to be very fractured. In the series, Rhodocetus is only depicted by a skull.
Many people have asserted that those "legs" weren't just vestigial; they also participated in copulation. They might have even had a swimming feature. In conclusion, two skulls, one incomplete, maybe transitional skeleton, and a complete aquatic whale type with short hind legs. Our top example of an apparent evolutionary transition comes from these data.
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the graph shows the motion of an object in both the x and y directions. Classify the motion of this object.
Answer:
where is the graph?
Explanation:
NO LINKS PLEASE
Which of the following was NOT a discovery that William Harvey made about the body's circulatory system?
O A. Blood flows in a circle through the body.
O B. Blood flows through pores in the tissues.
O C. The heart has one way valves to direct blood flow.
OD. Blood leaves the heart through arteries and returns through veins.
Answer:
blood flows through pores in the tissues
Please answer I really need help
Answer:
The answers to the blank spaces are numbered as follows:
1. Function
2. Nucleus
3. Mitochondria
4. ATP
5. Chloroplast
6. Glucose
7. Ribosomes
Explanation:
This question is describing the organelles found in a cell. An organelle is a structure that performs a specific FUNCTION (1) in a cell. There are different kinds of organelles with each possessing its own peculiar function. Some of them are as follows:
- NUCLEUS, which is regarded as the brain of a cell because it directs or controls a cell's activities just like the brain of an organism does.
- MITOCHONDRIA is an organelle that produces the energy storing compound called ATP (adenosine triphosphate), hence, it is called power house of the cell.
- CHLOROPLAST is an organelle found in plant cells that functions in the conversion of light energy (from sun) into GLUCOSE (chemical energy) in a process called PHOTOSYNTHESIS.
- RIBOSOMES is an organelle found in both prokaryotic and eukaryotic cells that serves as the site of PROTEIN production in a cell.
Can cyanide cause permanent damage?
Answer:
it can cause damage to the Brian and heart.
Explanation:
when you swallow, food, water, and other liquids move into the ____, a hollow tube that connects the mouth to the stomach
Which of the following is the best source of
scientific data?
A. Magazine
B. Scientific journal
C. Newspaper
D. Radio
Answer:
Scientific journal B:
Explanation:
HOPE IT'LL HELPS!!
I hope you guys are having a wonderful day but can you guys help? :/
Answer:
I know I am sure am going to have a wonderful day
Which of the following statements best explains why evolution by natural selection is considered a theory and not a hypothesis?
A. Evolution is an educated guess as to how species have changed over time.
B. Evolution is often refuted by other scientists, which is why it is only a theory.
C. Evolution is supported by a wide range of evidence from different fields of science.
D. Evolution started as a law, but after fossil evidence was discovered, it became a theory.
Answer:is that the full question
Explanation:
Which of the following accurately describes a
biome?
O A. A group of individuals of the same species
that live in a particular geographic region
and compete for resources
B. A group of plant species that live in a
particular geographic region and compete
for resources
C. A group of ecosystems that are near one
another and have similar climates but do
not interact
D. A group of populations that live in the same
area but do not compete for the same
resources
Answer:
The answer is A.
Explanation:
(This definition I got from the web so credits to them)
A biome is an area classified according to the species that live in that location. Temperature range, soil type, and the amount of light and water are unique to a particular place and form the niches for specific species allowing scientists to define the biome.
Which of the following genotypes would most likely lead to a low birth weight and a small placenta?
A. Igf2+/Igf2- where the mutated Igf2- allele comes from the paternal source.
B. Igf2+/Igf2- and it doesn't matter which parental source the mutated Igf2- comes from.
C. Igf2+/Igf2- but only in female progeny as the Igf2 gene is on the X-chromosome.
D. Igf2+/Igf2+ where neither maternal nor paternal allele is mutated.
E. Igf2+/Igf2- where the mutated Igf2- allele comes from the maternal source.
Igf2+/Igf2-, a genetic condition in which the mutated Igf2-allele is inherited from the father. B. Igf2+/Igf2-, and the parent from whence the mutant Igf2- comes is unimportant.
Whatever happens to a placental after delivery?
The placenta usually breaks from the uterine lining after childbirth. The placenta may still be partially or entirely attached to the uterus when there is placental accreta. This condition happens when the blood vessels and other parts of the placenta encroach too deeply into the uterine lining.
What benefits may you expect if you eat your placenta?
Despite suggestions that eating the placenta can reduce postpartum hemorrhage, increase mood and energy, increase milk production, and provide essential micronutrients like iron, there is no evidence to support any health benefits. You can suffer from placentophagy.
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I think I've finally figured out the problem with anti-vaccer's
Answer:
Wow. They're both right... I still think Vaccines aren't healthy.
Explanation:
what enzyme can proof-read the dna molecule, minimizing the mistakes made during the process of dna replication?
DNA polymerase enzyme proofreads the DNA molecule to minimize errors during DNA replication.
DNA polymerase enzymes are the enzyme that carries out DNA replication. During this mechanism, a wide range of errors can occur. DNA polymerase read the nucleotide in the template strand and pairs it with the complimentary nucleotide, that is adenine to thymine and guanine to cytosine. But errors occur all the time during this pairing.
But DNA polymerase also carries out proofreading along with the formation of the strand. When an incorrect nucleotide is paired, the whole mechanism is arrested. DNA polymerase identifies the errors by detecting the variation in the 3' OH group. The strand formation is stopped, and the incorrect nucleotide is replaced by the correct one, only after that the process continues.
The errors during DNA replication are rectified either by Base excision repair or Nucleotide excision repair. These are carried out by DNA polymerase as well as DNA ligase enzymes
DNA replication and proofreading are undertaken by the same enzyme, DNA polymerase.
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Snow leopards are very rare because they occupy what level of the food chain
Answer:
One big reason that snow leopards are endangered is because of poaching. Poachers illegally kill snow leopards, even though they are endangered, and sell the animals for money. The snow leopard's thick, white fur is highly sought after to make fur clothing.
Explanation:
hope this helps
Answer: One big reason that snow leopards are endangered is because of poaching. Poachers illegally kill snow leopards, even though they are endangered, and sell the animals for money. The snow leopard's thick, white fur is highly sought after to make fur clothing.
Explanation:
Sewage that end up in waterway can increae algae growth becaue it
A. Kill plant
B. Provide nutrient
C. Ue oxygen
D. Attract bird
Sewage that ends up in waterway can increase algae growth because it B. Provides nutrients.
Algae growth in waterbodies is aided by the nutrients phosphorus and nitrogen, which are necessary for algae production.
Eutrophication is the process that leads to harmful algal blooms, dead zones, and fish kills. Eutrophication begins with an increase in the amount of nutrients that reach estuaries and coastal waters. An overabundance of algae and plants initiates a chain reaction in the ecosystem as a result of eutrophication. The excessive plant and algae matter eventually breaks down, releasing a lot of carbon dioxide.
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Explain the application of biology epecially the role of microbilogy and biotechnology for the growing public and global health need
A, in the development of effective diagnotic ,prevention and treatment meaure including production of novel drug and recombnant vaccine
B, in the production of nutritionally enriched genetically modified crop and animal to alloviate food inecurity which i a common dilemma particularly in underdeveloped countrie
Biotechnology is the application of biology to the creation of new things, processes, and creatures with the goal of enhancing society and human health.
A. Medical biotechnology is a subspecialty of medicine that conducts research on living cells and cell components before creating pharmacological and diagnostic products. These goods aid in both disease treatment and prevention. Modern diagnostic and preventative medical devices, such as diagnostic test kits, vaccinations, and radio-labeled biological treatments used for imaging and analysis, have been made possible by advances in biotechnology.
B. By improving crop quality and in some cases productivity, biotech crops can boost farming's profitability. Some of these crops can make work easier and increase farmer safety. As a result, farmers may focus more of their time on other lucrative activities and spend less time cultivating their crops.
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Question 1 of 30
How do scientists collect data?
A. Through careful observation and measurement
B. Through interpretation of the conclusions
C. Through educated guesses
F
D. Through analysis of the results
Answer:
A.
Through careful observation and measurement
What type of mutation has occurred in the following example?
Original DNA Sequence ATC GGC TAG GCA
Mutated DNA Sequence
ATC AGG CTA GGC
A) deletion mutation
B) germ-cell mutation
C) insertion mutation
Explanation:
What type of mutation has occurred in the following example?
Original DNA Sequence ATC GGC TAG GCA
Mutated DNA Sequence
ATC AGG CTA GGC
A) deletion mutation