Answer:
During mitosis the four centrioles appear visibly and move to the ends of the nucleus one pair at each end then they produce a series of threads that attach to the chromosomes During cell division the threads split the chromosomes and drew them towards the centrioles.
Explanation:
During mitosis, centrioles replicate and help organize the spindle fibers. They move to opposite poles of the cell and then complete the formation of the spindle fibers in metaphase.
Explanation:During mitosis, the centrioles play a crucial role in organizing the spindle fibers that separate the chromosomes. Before mitosis begins, the centrioles replicate so that each daughter cell will receive a pair of centrioles. In prophase, the centrioles move to opposite poles of the cell and begin to form the spindle apparatus. Then, in metaphase, the centrioles complete the formation of the spindle fibers and help align the chromosomes in the cell's equator.
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Explain why vision is lost when it hits the blind spot.
What antibiotic would be best to treat a pus-forming wound? Why?
How are turtles and fish alike?
How are they different?
Trees in the tropical rainforest have ________ root systems because ________.
The earliest evidence for humans in australia dates back to ________ years ago.
The speed of light in water is 2.25 x 108 m/s. What is true about the index of refraction of water?
Any astronomical body that revolves around a larger body is called
Any astronomical body that revolves around a larger body is known as Satellite.
What is Satellite?A natural or an artificial body which revolve around the planet in order to collect essential information or for communication is called as Satellite.
It can be natural or artificial. The moon, planet or machine that orbits a planet or star are satellites.
Earth can be called satellite as it orbits the sun, similarly the moon is a satellite as it orbits Earth.
Artificial or man made satellites are designed usually to collect the essential data like climate reports, temperature, humidity, gaseous content and for communication.
Man made satellites are designed in a certain way that with a less time it can collect more information compared to ground level instruments.
Hence, an astronomical body that revolves around a larger body is called as satellite.
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Which of the following helps to explain how migrant finches arriving to the Galapagos Islands from South America aided in speciation?
A. Mutations
B. Temporal isolation
C. The founder effect
D. Bottleneck
Student Answer: A
Answer: Incorrect
What helps wilted plants become firm during osmosis
Final answer:
Wilted plants regain firmness through osmosis, which restores turgor pressure when water enters the cells, counteracting plasmolysis and providing structural support.
Explanation:
During osmosis, wilted plants become firm as water is absorbed into the plant cells, increasing turgor pressure. This pressure stiffens the cell walls and enables the plant to stand upright. In a dehydrated plant, the extracellular fluid becomes hypertonic, causing water to leave the plant cells and resulting in wilting. When the plant is watered, the environment becomes hypotonic, water enters the cells due to the slightly hypertonic nature of the cytoplasm, and turgor pressure is restored. Nonwoody plants rely on this turgor pressure for structural support. If a plant remains without water for too long, plasmolysis can occur, where the cell membrane detaches from the non-flexible cell wall as water leaves, exacerbating the wilting condition. Providing adequate water to the plant will reverse plasmolysis, restore turgor pressure, and return the plant to a firmer state.
Bacteria in your lab are grown under two conditions, one with exposure to glucose and the other with lactose. what best describes the effects glucose will have upon the enzymes used to metabolize lactose?
what has the study of fossils allowed scientists to do
The study of fossils has enabled scientists to build a historical record of life on Earth, determine the age of rock layers, and advance our understanding of evolutionary biology.
Explanation:The study of fossils has allowed scientists to do a number of significant things. First, fossils provide a historical record of life on Earth, helping us understand what kinds of organisms have existed, how they lived, and how they evolved over time. This is because fossils are basically the preserved remains or traces of ancient organisms.
Secondly, by studying fossils, scientists are able to determine the age of rock layers. This helps build the field of stratigraphy, which is crucial in understanding Earth's geological history. By understanding the sequence of rock layers and the fossils found within them, scientists can piece together a chronological narrative of Earth's biological and geological history.
Finally, the study of fossils has advanced our understanding of evolutionary biology. Fossils reveal patterns of evolution, such as gradual changes over time, or sudden changes due to major ecological events. These patterns help scientists develop and refine theories about how life changes through time.
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What is the most likely explanation for this similarity between organisms in madagascar, india, and australia?
The voltage of a neural membrane that is sufficient to cause an action potential is approximately ______ and is referred to as a(n) ______.
The chemical formula of a compound describes the elements of compound contains and the.........
The chemical formula of a compound describes the elements of compound contains and the ratio of elements in the compound
For example, the chemical formula for water is H2O. This tells us that water is made up of two hydrogen atoms and one oxygen atom. The ratio of hydrogen to oxygen atoms in water is 2:1.
Another example is the chemical formula for carbon dioxide, CO2. This tells us that carbon dioxide is made up of one carbon atom and two oxygen atoms. The ratio of carbon to oxygen atoms in carbon dioxide is 1:2.
Chemical formulas are important because they allow us to identify and characterize compounds. They also allow us to calculate the amount of each element in a compound and to predict the chemical properties of a compound.
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Why are the male testes located in the scrotum outside the body?
Male testes are located in the scrotum outside the body to maintain an optimal temperature for sperm production, which is slightly cooler than the body's internal temperature.
Explanation:The male testes are located in the scrotum outside the body due to temperature regulation. The process of sperm production, or spermatogenesis, requires conditions that are slightly cooler than the body's typical internal temperature. Being located in the scrotum allows the testes to remain at an optimum temperature, approximately 2-4 degrees Celsius cooler than the body's core temperature, which contributes to efficient and healthy sperm production.
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Without finding the exact sum, tell whether 5/12 + 1/2 is less than 1, greater than 1, or equal to 1.
The difference in elevation between the highest and lowest contour lines on a topographical map is called
people build roads in new areas. how does this activity affect the living things in that environment?
Plants need nitrogen in order to survive. The problem is they cannot take in the atmospheric nitrogen, but instead must rely on a certain class of bacteria that are able to turn atmospheric nitrogen into other nitrogen compounds, such as ammonia and nitrates. What is the name of this process?
Answer:
Nitrogen fixation is the name of the process in which the atmospheric dinitrogen is converted into a form which can be used by the plants for their growth. The nitrogen fixation is done by a soil bacteria called as rhizobia which lives in symbiotic association with the root nodules of the leguminous plants. The bacteria converts the atmospheric dinitrogen into ammonia and nitrates which are readily absorbed by the plants. In return the the bacteria obtains the carbohydrates from the plants as a source of food.
The physical interaction between the respiratory and the cardiovascular system takes place at which respiratory structure in a human? a,brochioles b.alveoli c.bronchi d,respiratory vessels e,gill filaments
If eight alleles exist in a population, what is the maximum number of copies an unaffected individual is expected to have?
the maximum number of copies an unaffected individual is expected to have is two, reflecting the diploid nature of organisms and the fact that they inherit one allele from each parent for a given gene.
What is the maximum number of copies an unaffected individual is expected to have?
In a diploid organism, an individual carries two alleles for each gene, one inherited from each parent. Therefore, the maximum number of copies of alleles that an unaffected individual is expected to have is two.
Diploid Organism: Humans and many other organisms are diploid, meaning they have two sets of chromosomes (one from each parent). This includes two copies of each gene.
Alleles: Alleles are different versions of a gene that can occupy the same position (locus) on a chromosome. For any given gene, an individual inherits one allele from each parent.
For example, if a gene for eye color has alleles "B" and "b," an individual might inherit "B" from one parent and "b" from the other.
Number of Alleles in a Population: The question mentions that there are eight alleles in the population. This means that, for a particular gene, there are eight different variations or versions (alleles) present in the entire group of individuals.
Number of Copies in an Unaffected Individual: Since an individual is diploid, they have two copies of each gene. Therefore, for a gene with eight alleles in the population, an unaffected individual is expected to have a maximum of two copies.
The pigment molecules responsible for photosynthesis are located in the
A) mitochondria
B) cytoplasm of the cell
C) stroma of the chloroplast
D) thylakoid membrane of the chloroplast
E) all of the above
The pigments involved in photosynthesis are located in the thylakoid membrane of chloroplasts, which is where the light-dependent reactions take place.
Explanation:The pigment molecules responsible for photosynthesis, such as chlorophyll, are located in the D) thylakoid membrane of the chloroplast. Within these membranes, chlorophyll and other pigments absorb light energy, which is essential for the light-dependent reactions of photosynthesis. The thylakoids are disc-shaped structures stacked into grana, and these are where the initial steps of photosynthesis occur.
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which of the following are included in the binomial name given to an organism?
a. Kingdom, Family
b. Species, Family
c. Order, Genus
d. Genus, Species
Answer: Binomial name consists of two words. The first words shows the Genus of the organism and the second word shows the species of the organism.
Explanation:
The binomial nomenclature given by the Linnaeus represent the genus and species of the organism. The scientific nomenclature of the plants and animals use genus as the first name of the organism and species as the second name of the organism.
Example: Humans are named as Homo sapiens, in which the genus is Homo and the species is sapiens.
Three main levels of neural integration operate in the somatosensory system. Which level involves the spinal cord?
perceptual level
receptor level
integrative level
circuit level
Axons of ganglion cells form the optic tract. these fibers synapse in the ________.
The inner plexiform layer (IPL) of the retina contains bipolar and amacrine cells, which RGCs synapse with to receive excitatory and inhibitory synaptic inputs, respectively.
What is the role of fiber's to synapse?Their central processes connect with ganglion cells, a particular type of neuron found close to the inner surface of the retina, on the vitreous surface of the retina.
And their central processes exit the globe via the optic disc to create the actual optic nerve. The optic nerve is distinctive due to a few characteristics.
The retina's output neurons are called retinal ganglion cells, or RGCs for short.
The optic nerve receives the retina's nerve signals after they have traveled through the back of the eye. These signals are delivered by the optic nerve to the brain, which perceives them as visual images.
Therefore, Axons of ganglion cells form the optic tract. These fibers' synapse in the eyes.
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The white-tailed deer, Odocoileus virginianus, is common in the Eastern United States. Most deer have reddish brown fur, but occasionally a deer may be born with a genetic condition known as albinism which results in white fur. Albinism is caused by the inheritance of two recessive alleles for the production of coloration pigments. If an albino deer is born to two parents who each have normal fur coloration, what conclusion may be drawn about the genotypes of the parent deer?
Answer:
Both the parents must be the carrier of recessive genes along with dominant gene
Explanation:
Recessive genes are genes that are expressed only when two recessive alleles are inherited from the parents.
A dominant gene is expressed in two cases a) when two dominant alleles are inherited or b) when one dominant and one recessive allele are inherited.
since parents have normal fur color but they are producing white fur coloured deer (Albinitic offsprings) this means that both of the parents must be the carrier of recessive genes.
Let the allele for “normal fur colour” be expressed by C
Allele for “white fur color” be expressed by c.
Both the parents have heterozygous dominant gene (which is carrier if recessive allele "c"), thus their genotype would be Cc
Let see the punnet square below -
C c
C CC Cc
c Cc cc
Out of the four offspring’s produced only “cc” represents white fur deer.
Which of the following would be the last step in the process of DNA fingerprinting?
A DNA sample is obtained.
B. Restriction fragments are separated.
C. Restriction enzymes are used to cut DNA into fragments.
D. DNA fragments containing repeats are labeled with radioactive probes.
Answer:
(D). DNA fragments containing repeats are labeled with radioactive probes.
Explanation:
DNA fingerprinting can be defined as a process, which involves identification of DNA characteristics of an organism as unique in all organisms as fingerprints.
There are total five steps in DNA fingerprinting, which include isolation of DNA from the cells, digestion of DNA with restriction enzymes, separation of DNA fragments in agarose gel, transfer of DNA fragments to a blotting paper, and labeling of DNA fragments with radioactive probes of specific sequence to see the results.
Thus, the correct answer is option (D) as represents that last step of DNA fingerprinting.
Which of the following is true of receptors for dynamic equilibrium?
The receptors for dynamic equilibrium are called maculae.
The receptors for dynamic equilibrium are not stimulated by head movement.
The receptors for dynamic equilibrium are located in the vestibule of the ear.
The receptors for dynamic equilibrium respond to rotational forces.
The receptors for dynamic equilibrium are located in the vestibule of the ear.
Explanation:The correct option is: The receptors for dynamic equilibrium are located in the vestibule of the ear. The receptors for dynamic equilibrium are called cristae ampullaris, not maculae. These receptors are stimulated by head movement as they detect changes in rotational forces. Maculae, instead, are the receptors for static equilibrium.
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The receptors for dynamic equilibrium are located in the semicircular canals of the inner ear and respond to rotational forces, not to be confused with the maculae in the utricle and saccule which detect linear accelerations and tilts.
The receptors for dynamic equilibrium respond to rotational forces and are stimulated by head movement. These receptors are located in the semicircular canals of the inner ear. The utricle and saccule within the vestibule sense linear accelerations and head tilts due to gravity, but it is the semicircular canals that specifically sense rotational movements, such as when turning the head from side to side.
A fairly new technology that uses radio signals to send and receive information is referred to as
A. MAR.
B. RFID.
C. GUI.
D. barcoding.
Answer:
B. RFID.
Explanation:
Radio Frequency Identification (RFID) is designed to replace conventional barcode scanning. Bar code reading requires the reader's approach to the code, with exact angle and interpretation time. Basically it is the same used in supermarkets and various stores.
RFID reading technology utilizes short-range communication that can be automatically read by sensors when passing the RF tag carrier. Same task more efficiently, less time and greater accuracy. That is, this technology allows radio signals to send and receive information.
How do photoautotrophs make energy?
They covert carbon dioxide, water, and sunlight into carbohydrates.