La presencia de un núcleo organizado en el interior de la célula es característica de: a)celula procarionte b) celula eucarionte c) las bacterias d) los virus

You have just witnessed a car accident. Your heart rate and respiration rate are likely to be elevated due to sympathetic nervous system activity.

The nervous system is an extensive organ network that connects various body parts and systems to coordinate and control the body's functions. It is the master controlling and communication system in the body, comprising the brain, spinal cord, and peripheral nerves. The nervous system consists of two major divisions: the central nervous system (CNS) and the peripheral nervous system (PNS).

The nervous system controls the body's functions through electrical signals, the nervous impulses that travel along nerve cells called neurons. The nervous system detects changes inside and outside the body and initiates responses to maintain homeostasis. It has two main types of nerve cells: the sensory neurons that detect stimuli and carry signals from receptors to the CNS, and the motor neurons that carry signals from the CNS to the muscles and glands.

The nervous system regulates heart rate and respiration rate to meet the body's demand for oxygen and nutrients. Sympathetic and parasympathetic divisions of the autonomic nervous system (ANS) control heart rate and respiration rate. The sympathetic division is responsible for increasing heart rate and respiration rate during stress or exercise, while the parasympathetic division decreases heart rate and respiration rate during rest or relaxation.

When you witness a car accident, your nervous system's sympathetic division is activated, leading to the release of adrenaline and noradrenaline hormones that prepare your body to respond to the perceived threat. These hormones cause your heart rate and respiration rate to increase, increasing oxygen and nutrients delivery to your tissues and muscles and preparing them to fight or flee. The activation of the sympathetic nervous system during stress is an adaptive response that helps you cope with the perceived danger.

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To determine if the genes are linked, we need to compare the observed frequencies of the different genotypes with the expected frequencies based on independent assortment. If the observed frequencies deviate significantly from the expected frequencies, then the genes are likely linked.

In this case, the observed frequencies suggest that the genes are linked, as there are fewer double recombinants than would be expected if the genes were assorting independently. Based on the data, we can infer that the order of the genes on the chromosome is: C-S-f-s.

Double crossover refers to a crossover event that occurs between two loci, resulting in the exchange of the intervening segment between the homologous chromosomes. Non-crossover events refer to no exchange of genetic material between homologous chromosomes. Single crossovers occur when there is only one exchange of genetic material between homologous chromosomes.

The parental cross would be CFS x cfs, and the test cross would be CfS/cFs/CFs/cfs x cfss. To construct a linkage map, we need to calculate the recombination frequencies between the different genes. The recombination frequency between two genes is equal to the number of recombinant progeny divided by the total number of progeny.

The map distances between the genes can be calculated by multiplying the recombination frequencies by 100.

C-S: 118/1000 = 0.118

S-f: 456/1000 = 0.456

f-s: 72/1000 = 0.072

The map distances are:

C-S: 11.8 cM

S-f: 45.6 cM

f-s: 7.2 cM

The coefficient of coincidence (CC) is equal to the observed double crossover frequency divided by the expected double crossover frequency. The expected double crossover frequency can be calculated by multiplying the recombination frequencies of the two adjacent intervals. In this case, the expected double crossover frequency between S and f is (1-0.118) x 0.456 = 0.397. The observed double crossover frequency is 6/1000 = 0.006.

CC = 0.006/0.397 = 0.015

The interference (I) is equal to 1 - CC. In this case, the interference is 1 - 0.015 = 0.985. This indicates that the occurrence of a double crossover event between S and f reduces the likelihood of a second double crossover event occurring nearby, as interference is high.

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The above is about Biochemical Cycles. The information that comletes the table as well as describes Photosynthesis Equation are given below.

Adds CO₂

Removes CO₂

The word equation for Photosynthesis is:

Carbon Dioxide + Water + Sunlight → Glucose + Oxygen

Note that CO₂   is removed form the surface of the Earth via physical processes such as dissolution in the ocean via chemical weathering o frocks.

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Cellular respiration is usually defined as: the oxidation of organic compounds that occurs within cells, producing energy for cellular processes.

Oxidation is the reaction that occurs by adding oxygen to other materials, often in combination with water.

Organic compounds are compounds that contain carbon bonded with other elements, such as hydrogen, nitrogen, sulfur, and more.

Cells are the smallest form of life - the functional and structural units of all living things.

Answer:

Explanation:

The scientific method

1. Make an observation.

2. Develop a hypothesis.

3. Test hypothesis by trying different experiements.

4. Collect data.

5. Determine if hypothesis is supported by data.

Observation Felt sleepy after eating lunch.

Hypothesis 1: Student wanted to be more alert for afternoon class and hypothesized exercise might make her feel alert to pay better attention in class.

Experimentation and data collection: Tried exercising before class to alleviated sleepiness but still felt sleepy.

Hypothesis 2: Student wanted to be more alert for afternoon class and hypothesized drinking water during class might make her feel alert.

Experimentation and data collection: Tried drinking water during class and discovered she felt more alert and was better able to pay attention in class.

Hypothesis supported through experimentation and data. Tried exercising and found it did not work. Tried drinking water and discovered it worked.

Answer:

Explanation:

the answer is option A.transverse waves

Answer:

B. Dominant traits

Explanation:

Dominant traits are as what the name implies, dominant over other traits. If something overpowers the other trait then it is a dominant trait.

Gymnosperms use pollen tubes, while seedless vascular plants rely on water for sperm to reach eggs.

Gymnosperms, such as conifers, employ the mechanism of pollen tubes for sperm delivery. Pollen grains are carried by wind or other pollinators to receptive female cones. Upon reaching the female cone, a pollen grain germinates and forms a pollen tube, which grows through the tissues of the cone until it reaches the ovule containing the egg.

In contrast, seedless vascular plants like ferns and horsetails depend on water for successful fertilization. They produce motile sperm cells that require a film of water to swim to the egg. The sperm is released into water, and they navigate towards the female reproductive structure called an archegonium. Within the archegonium, the sperm enters through the neck canal to fertilize the egg.

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The sympathetic nervous system is responsible for the release of epinephrine and norepinephrine from the adrenal medulla. When the body perceives a threat or stressor, the sympathetic nervous system activates the adrenal medulla, which then secretes these hormones into the bloodstream as part of the body's "fight or flight" response.

This response is a survival mechanism that prepares the body to respond quickly and effectively to potential danger or stress. In summary, the release of epinephrine and norepinephrine from the adrenal medulla is triggered by the activation of the sympathetic nervous system in response to a perceived threat or stressor.

The release of epinephrine and norepinephrine from the adrenal medulla is primarily triggered by the activation of the sympathetic nervous system in response to a stressor, such as physical or emotional stress. This activation prepares the body for the "fight or flight" response, increasing heart rate, blood pressure, and overall alertness.

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The increase in average beak length in Parus major birds can be explained by the process of natural selection.

What is Natural Selection?

Natural selection is the process through which specific features or characteristics, depending on whether they aid or impede an organism's capacity to live and reproduce, gradually become more or less prevalent in a population over time.

The availability of food from gardens is decreasing. Thus birds that are more adapted to survive on a diet of more challenging seeds, nuts, and berries will have a higher chance of surviving and procreating. The longer beaks of birds make it easier for them to break open and ingest the nutrients from these more challenging foods.

As a result, as time goes on, the population's frequency of the genes that produce longer beaks will rise, and so will the average beak length. This is an example of directional selection, in which the pressure of selection favors individuals with longer beaks at one end of the distribution of a feature.

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Amino acids joining together to make a peptide is a good example of a condensation reaction.

A condensation reaction is a reaction of two substances with the simultaneous loss of water or other small molecule.

A polypeptide or protein is a polymer made up of monomers called amino acids. These amino acids combine to form the protein.

Amino acid is made up of the following components;

When two or more amino acids combine, a molecule of water is lost, hence, it is a type of condensation reaction.

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Two of Ethan and Edna's eight children would be carriers of the colorblindness gene (1 in 4 chance), and about six of them would have the normal form of the gene and not be affected by the condition.

Colorblindness is an inherited condition that is caused by a genetic mutation that affects the normal function of the photopigments in the retina of the eye. These photopigments, called cone cells, are responsible for detecting different wavelengths of light, which allows us to see a wide range of colors.

Ethan is colorblind, which means that he has a mutated form of the gene responsible for the normal function of the cone cells. This mutated form of the gene is recessive, which means that a person needs to inherit two copies of the mutant gene (one from each parent) to be affected by the condition. If a person only inherits one copy of the mutant gene, they will be a carrier of the condition but will not be affected by it.

Edna is homozygous for the normal color vision allele, which means that she has two copies of the normal form of the gene and is not a carrier of the colorblindness gene. If Ethan and Edna have eight children, each child has a 1 in 4 (25%) chance of inheriting the colorblindness gene from Ethan. Since Ethan has only one copy of the mutant gene, each child has a 3 in 4 (75%) chance of inheriting the normal form of the gene from Edna.

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18 %

T= A = 32%

G= C =x

So :-

T+A+G+ C = 100%

32+32+x+x = 100%

64+2x=100%

2x=100-64

2x = 36

x= 18%

Answer:

asexual reproduction through budding in the leaf

When a compound passes from the plasma to the CSF, it first goes through the extracellular matrix, then the astrocytes, then pericytes, then the capillary endothelium and finally to the CSF.

Cerebrospinal fluid or the CSF is a clear and colorless fluid which is found in the tissues which are present around the brain and the spinal cord. The blood brain barrier or the BBB is the network which consists of tissues and blood vessels which perform the function of keeping the harmful substances away from the brain.

When a particular compound passes from the plasma to CSF, it first has to pass through the extracellular matrix of the ECM. From the ECM, it goes to the astrocytes and then to the pericytes. The compound then passes to the capillary endothelium from where it finally reaches the CSF.

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Small proteins released from tissue cells infected with viruses, as well as from activated lymphocytes and macrophages, are called Interferons

A collection of signalling proteins known as interferons are produced and released by host cells in response to the presence of certain viruses. Typically, a virus-infected cell will release interferons, boosting the antiviral defences of neighbouring cells.

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Answer:

Darwin conducted an experiment with breeding pigeons.

Explanation:

The pigeons provided the perfect animal to test his theory of selection for quite a number of reasons including its trait diversity from wing structures to color patterns to size to flight patterns. From these experiments he concluded that by natural selection of randomly occurring traits that make species better suited for survival and reproduction, evolve in the astounding diversity of organisms on Earth today.

(not my words)

Answer:

its b

Explanation:

Answer:

Eventually, enough CO2 escaped from volcanoes to begin a period of global warming; melting opened a great variety of new niches. When CO2 levels were high, they created a greenhouse effect. More heat was trapped on Earth's surface, and the climate became warmer.

Explanation:

Answer:

I'm pretty sure it's just a fancy rock

the closest i could find was something like "polish stone"

Answer:

Explanation:

The expected rate of return of Freedman Flowers is 9.9%.

Expected rate of return is the sum of the multiplication of each possible return with its corresponding probability of occurrence. Freedman Flowers' stock has a 50% chance of producing a 25% return, a 30% chance of producing a 10% return, and a 20% chance of producing a -28% return. The expected rate of return of Freedman Flowers can be calculated as follows:

Expected rate of return = (Probability of return 1 × Return 1) + (Probability of return 2 × Return 2) + (Probability of return 3 × Return 3)

Therefore, the expected rate of return of Freedman Flowers is:

Expected rate of return = (0.5 × 25%) + (0.3 × 10%) + (0.2 × -28%)

Expected rate of return = 12.5% + 3% - 5.6%

Expected rate of return = 9.9%

Therefore, the expected rate of return of Freedman Flowers is 9.9%.Option B, 9.9006 is the closest to the calculated expected rate of return.

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It will take approximately 39.93 days for one amoeba to produce a population of 1000, considering the doubling time of 4 days.

An amoeba's population growth can be modeled using exponential growth. In this case, the population doubles every 4 days, which is the doubling time. To determine how long it takes for one amoeba to produce a population of 1000, we will use the formula for exponential growth:

Final Population (P) = Initial Population (P0) * \(2^{(t/T)\),

where P is the final population, P0 is the initial population, t is the time, and T is the doubling time.

In this scenario, P0 = 1 (single amoeba), P = 1000, and T = 4 days. We need to find t, the time it takes to reach the population of 1000. Rearranging the formula, we get:

t = T * (log(P/P0) / log(2))

Plugging in the values:

t = 4 * (log(1000/1) / log(2))

Calculating the result:

t ≈ 39.93 days

It will take approximately 39.93 days for one amoeba to produce a population of 1000.

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Answer:

The primary enzyme involved in this is DNA polymerase which joins nucleotides to synthesize the new complementary strand.

The majority of DNA damage is immediately repaired thanks to these proteins. Yet, a cell is less able to repair itself if the DNA damage affects a gene that produces a DNA repair protein.

Hence, as mistakes accumulate in other genes over time, a cancer might develop. On the other side, exogenous DNA damage takes place when environmental, physical, and chemical factors harm the DNA. Alkylating agents, ionizing radiation, and crosslinking agents are a few examples.

Checkpoint mechanisms during the cell cycle make sure that a cell's DNA is intact before allowing DNA replication and cell division to take place. Failures at these checkpoints may cause damage to build up, which in turn may cause mutations.

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Answer:

true

Explanation:

False, there is a difference between primate language and human language.

While both primates and humans possess the ability to communicate through various forms of language, there are distinct differences between primate language and human language. Primates, such as chimpanzees and gorillas, use a form of communication known as "primate language," which primarily consists of vocalizations, gestures, and body language. However, primate language is more limited in its complexity and lacks the grammar, syntax, and abstract thinking present in human language.

Human language, on the other hand, is characterized by its rich vocabulary, grammatical structures, and the ability to convey abstract concepts and ideas. Humans can communicate through spoken and written language, allowing for complex communication that is not observed in primate language. Thus, while both primates and humans possess language capabilities, human language is more advanced and distinct in its complexity.

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