Answers
Answer: Chiasmata are specialized chromatin structures that link homologous chromosomes together until anaphase I (Figs. 45.1 and 45.10). They form at sites where programmed DNA breaks generated by Spo11 undergo the full recombination pathway to generate crossovers. At a given chiasma, an exchange of genetic material can occur between both chromatids, what is called a chromosomal crossover, but this is much more frequent during meiosis than mitosis. In meiosis, absence of a chiasma generally results in improper chromosomal segregation and aneuploidy.
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Related Questions
Explain how it is possible for nutrients to be transported to the cells of a flatworm with no circulatory system.
Answers
Answer:
Flatworms are beings that do not have a heart, veins, arteries, capillaries, hemolymph, or some type of circulatory fluid. Their circulation occurs between cells or intercellularly and they are responsible for transporting substances by diffusion from cell to cell.
Explanation:
Flatworms are considered multicellular eukaryotic organisms. This implies that in their cells they have a cellular nucleus, in which the DNA is contained, structuring the chromosomes. Likewise, they are made up of several types of cells, each one specialized in a specific function. They lack a structured circulatory system as such. Because of this they do not have specialized structures such as a heart or blood vessels, however, the circulation of certain substances is established between their cells. This is done thanks to the diffusion process. Substances pass from one cell to another through this process.This does not apply to all flatworms, since in some species of bog and digenae there is a certain organization and some very small conducting vessels known as the endolymphatic system, the which forms a kind of plexus in the parenchyma.It should also be noted that some species do not even have a digestive system, being the digestive tract the one in charge of digestive functions and the distribution of the nutrients they receive.
why did china remain isolated
Answers
Answer:
In the last 50 years or so of the Ming Dyansties, the emperor simply lacked the necessary resources and man power to sustain large amounts of trade, causing China to become isolated from the world.
Explanation:
Which of the following non-renewable sources of energy has the smallest amount of
Fuel left on Earth?
Answers
Answer:
just so I can see the question dont mind this
Answer:
You didn’t put any options if you say the options i will answer.
Explanation:
1) Jupiter, mars, and_______ have wind
2) ______ means to wear away
3) at a wind farm they harvest_______ energy
Answers
Answer:
1)Earth
2)disappear
3)Solar energy
Explanation:
I am not sure but hope it helps let me know if its correct.
GOOD LUCK!
Someone help plz like plz
Answers
Answer:
expreesiom
Explanation:
exp 90
expe 80
omg ppn
ppn tenzin
ff
fortnite
pubg
Distinguish the types of forgetting: anterograde amnesia, retrograde amnesia, encoding failure, retrieval failure, and interference (both retroactive and proactive).
Answers
Answer:
Anterograde amnesia is the inability to create new memories after the onset of amnesia, while memories from before the event remain intact. Brain regions related to this condition include the medial temporal lobe, medial diencephalon, and hippocampus. Anterograde amnesia can be caused by the effects of long-term alcoholism, severe malnutrition, stroke, head trauma, surgery, Wernicke-Korsakoff syndrome, cerebrovascular events, anoxia, or other trauma. Retrograde amnesia is the inability to recall memories made before the onset of amnesia. Retrograde amnesia is usually caused by head trauma or brain damage to parts of the brain other than the hippocampus (which is involved with the encoding process of new memories). Brain damage causing retrograde amnesia can be as varied as a cerebrovascular accident, stroke, tumor, hypoxia, encephalitis, or chronic alcoholism. The there is encoding failure. Encoding is the process of converting sensory input into a form able to be processed and stored in the memory. However, this process can be impacted by a number of factors, and how well information is encoded affects how well it is able to be recalled later. On the other hand, retrieval failure is the failure to recall information in the absence of memory cues. Proactive interference occurs when old memories hinder the ability to make new memories. In this type of interference, old information inhibits the ability to remember new information, such as when outdated scientific facts interfere with the ability to remember updated facts. This often occurs when memories are learned in similar contexts, or regarding similar things. It’s when we have preconceived notions about situations and events, and apply them to current situations and events.Retroactive interference occurs when old memories are changed by new ones, sometimes so much that the original memory is forgotten. This is when newly learned information interferes with and impedes the recall of previously learned information. The ability to recall previously learned information is greatly reduced if that information is not utilized, and there is substantial new information being presented. This often occurs when hearing recent news figures, then trying to remember earlier facts and figures.
Explanation:
Found it on a similar question
HAIR ANALYSIS
An investigator is excited to find a hair with the follicle attached when searching for evidence at a crime scene. Explain why the investigator might be excited.
Answers
The fact they hair follicles contains cellular materials rich in DNA will give them a strong lead in their investigation. Hence, the excitement.
The bottom of the hair follicle marks the point where hair growth begins, Investigators are often helped in their crime research by the outcome of DNA test. Therefore, investigators often seek materials or elements at crime scenes which could be evaluated to gives DNA result of potential suspects.Therefore, the fact that hair follicles contain cellular materials which are rich in DNA, will excite investigators as that have obtained a key lead in their investigation.
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These pellets are not eliminated as _________________, but are regurgitated through the ___________________.
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Answer:
These pellets are not eliminated as feces, but are regurgitated through the mouth. Pellets are not found exclusively within the owl families. There are many species of birds known to regurgitate pellets: hawks, eagles, kites, harriers, falcons, and even robins are some of the more familiar ones.
tell me if im wrong :/
PLSSSS HELPPPP ASAPPP
Answers
Answer:
the green 1
Explanation:
PLZZZ HELP ME Which of the following is NOT a characteristic of plants?
O Create food through photosynthesis
O Multicellular organisms
O Incapable of movement
O Capable of moving by themselves
Answers
Which sampling site had the highest proportion of heavily infected monarchs?
A. Mexico
B. Guif Coast
C. Northern United States
D. South America
Answers
Answer:
The correct answer is option D "Mexico"
Explanation:
In February 2008, we gathered grown-up rulers at two discrete overwintering destinations in the Neovolcanic Piles of Focal Mexico:
(I) Sierra Chincua
(ii) Cerro Pelon.
The two locations are situated in Michoacan, Mexico. Butterflies were gathered utilizing standard flying nets with expandable posts.
The commonness of monarchs vigorously infected with OE at every one of these two areas in 2008 was 14.4 and 13.6%.
From ten imitate bunches (five groups for every site), we arbitrarily chose sound and tainted butterflies following starter screening of parasite tests in the field, for a sum of 75 solid and 100 intensely infected monarchs.
The chemical equation of cellular respiration contains information about?
a. the relative amount of products and reactants.
b. the formation of glucose.
c. the intermediate reactions needed to break down glucose.
d. the environment in which cellular respiration occurs.
Answers
The chemical equation of cellular respiration comprises information regarding the relative amounts of products and reactants.
• The process, which takes place within the mitochondria of all the organisms is termed cellular respiration. In this process, the simple sugars are dissociated into water and carbon dioxide and release energy in the form of ATP.
• A chemical reaction is a procedure in which one or more components, that is, the reactants get transformed into one or more different components called the products.
• The substances, which start the reaction are called reactants, while the ones that get produced in the reaction are called products.
• The association between the reactants and products in a chemical reaction can be signified with the help of a chemical equation.
Thus, the chemical reaction of cellular respiration comprises information regarding the relative amount of products and reactants.
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what is the difference between cell structure and cell function?
Answers
Answer:
These cells have a membrane-bound nucleus that houses their DNA and contain extensive internal organelles (“little organs”) that perform specific functions. ... Differences occur in size, shape, and presence and number of various organelles and other structures. Each cell's structure correlates with its specific function.
Explanation:
Answer:
A cell can be defined as the smallest unit of life and an example include muscle cells. An aggregation of cells form tissues.
The major difference between a cell structure and cell function is in their functions and physical properties.
Cell structure: This talks about how the cells look like when viewed. A call contains components such as the nucleus, cytoplasm, cell membrane etc and each has their various functions to ensure the organisms/animals are able to perform various life activities.Cell function: This on the other hand refers to the various functions which a cell is able to perform and this is dependent on the component in question such as the nucleus which controls cell activities and cytoplasm which provides support and helps to house other organelles.
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Once a protein is made, its biochemical and structural properties play a role in producing ________.
a. phenotype
b. chromosome
c. DNA
d. mutant
e. genotype
Answers
Answer:
(D) mutant
Explanation:
Translation occurs at the ribosome, which consists of rRNA and proteins. ... Then, rRNA helps bonds form between the amino acids, producing a polypeptide chain. After a polypeptide chain is synthesized, it may undergo additional processing to form the finished protein. Learn how their functions are based on their three-dimensional structures, which ... bonds are formed by a biochemical reaction that extracts a water molecule as it joins to protein structure because these side chains can bond with one another to these stable folding patterns make up the secondary structure of a protein. A genotype is an organism’s set of heritable genes that can be passed down from parents to offspring. The genes take part in determining the characteristics that are observable in an organism, such as hair color, height, etc. An example of a characteristic determined by a genotype is the petal color in a pea plant. Phenotype is the term used in genetics for the composite observable characteristics or traits of an organism. The term covers the organism's morphology or physical form and structure, its developmental processes, its biochemical and physiological properties, its behavior, and the products of behavior.
Once a protein is made, its biochemical and structural properties play a role in producing option a. phenotype.
Phenotype is the observational traits or characteristics of an individual organism. This is an aspect that includes the morphology and the physical form of an organism.
Phenotypes are produced as genetic material that is Chromosomes and DNA are produce proteins, and once the protein is prepared, then proteins, contribute to the structural properties of the cell to make physical form or phenotype.
The biochemical and structural properties plays role in producing the phenotype as the various enzyme and biological reactions help in maintaining physical form and morphology and other aspects.
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Can someone be able to help, I’ll give brainly and extra points! Plus a 100 points! Ty!:)
Answers
Answer:
I can't see the media clearly:'(
what are the causes of antibiotics resistance ?
Answers
Answer:
Over-prescription of antibiotics.
Patients not finishing the entire antibiotic course.
Overuse of antibiotics in livestock and fish farming.
Poor infection control in health care settings.
Poor hygiene and sanitation.
Explanation:
Answer: Antibiotic resistance has become a global threat, and with Antibiotic Awareness Week, it is important to understand the series of events that have led the world to this predicament. Originally touted as a miracle discovery, we are seeing that there can be too much of a good thing.
Explanation: The use of antibiotics has saved millions of lives, but its pervasive use to treat any infection, whether serious, minor, or even viral has lead to the increase in antibiotic resistance. Antibiotics strictly target bacteria, but it is sometimes difficult to differentiate between viral and bacterial infections without costly tests. It is often less time-consuming and more cost effective to proactively prescribe antibiotics, rather than take precautions and prescribe only the correct treatment.
Another issue with antibiotics is the inability to monitor patient intake. Antibiotic dosages are designed to eradicate entire populations of the pathogens. When antibiotics are not taken for the entire prescribed course, pathogenic bacteria can adapt to the presence of low dose antibiotics, and eventually form a population that is completely resistant to the antibiotic regardless of the dosage.
Antibiotic usage is also not exclusive to humans. Every day, antibiotics are used to treat livestock and fish to prevent infections. Similar to overuse in humans, uncontrolled use of antibiotics creates a reservoir of bacteria that could become resistant, thus rendering the antibiotic useless.
10 POINTS !!! Why is it risky to build something whose natural frequency can be matched by
external vibrations?
Answers
Answer:Most objects have at least one natural frequency of vibration. If a nearby object vibrates at the same frequency, it can cause resonance. Resonance is an increase in amplitude of a vibration that occurs when external vibrations match an object's natural frequency.
Explanation:
It is risky to build something whose natural frequency is matched with external vibrations because of ; The effect of resonance
When an object constructed has a natural frequency which is equal to the frequency of a nearby external vibration, the amplitude of the vibration of the object will increase due to the resonance effect which occurs because the external frequency matches up with the natural frequency of the constructed object.
The negative effect of resonance is the increase in the amplitude of the vibration of the object which might lead to the partial or complete collapse of the constructed object.
Hence we can conclude that It is risky to build something whose natural frequency is matched with external vibrations because of ; The effect of resonance
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If you were stuck on an island, (without any technology,) how would you ask for help?
Explain your answer’s reasoning. If you don’t, then briefly tell how you will live out your life on your island.
Answers
Answer:
I would gather up as many resources as I can and spell SOS On the island where they can seeit spelled and I would grab A pocket nife and shine in towards the boat,helicopter.etc
Explanation:
Myasthenia Gravis is a disease characterized by the production of antibodies against nicotinic acetylcholine receptors resulting in a decrease of functioning receptors at Motor end plates. Physiologically, what might you expect to happen as a result?
a. clonus
b. increased frequency of motor neuron firing
c. chorea
d. paralysis of skeletal muscle
Answers
Answer:
The correct answer is - option d.
Explanation:
Myasthenia gravis is an autoimmune condition in which nerve endings are targeted due to the body produces antibodies against receptors of nicotinic acetylcholine which results in less or no functioning of nerve endings of motor neurons mostly.
Options A, B, and C all three conditions are all due to an increase in muscle movement which is not the case as it causes weakness in the muscles due to less functioning in motor end plates.
Sand is a ______ because you can see and identify the individual particles throughout.
Answers
Answer:
Heterogeneous
Explanation:
Sand may appear homogeneous from a distance but it is heterogeneous.
A fungus with white spores cross fertilizes a fungus with black spores. If 10% of the progeny bear white spores while 90% of the progeny bear black spores, what must be true?
A.
The trait for spore color is determined by exactly one gene.
B.
The trait for spore color is determined by more than one gene.
C.
The allele for black spores is dominant over that for white spores.
D.
The allele for white spores is dominant over that for black spores.
Answers
Answer:
C.
Explanation:
Since there are more of an outcome of black spores it would make sense that this trait is dominant.
White spores seem to be recessive in this case too.
I also suspect the parents are both heterozygous. They both carry one trait for black and one for white.
Hopefully this is correct. Have a great day.
Answer:
B. The trait for spore color is determined by more than one gene.
Explanation:
Took the test.
Name a storage protein in our bodies.
Explain the function of this storage protein in our bodies.
Where is this storage protein found?
please help
Answers
Answer:
Storage proteins serve as biological reserves of metal ions and amino acids, used by organisms. They are found in plant seeds, egg whites, and milk. Ferritin is an example of a storage protein that stores iron. Iron is a component of heme, which is contained in the transport protein, hemoglobin and in cytochromes.
Explanation:
Hope this helps.
If an egg cell contains 10 chromosomes, how many would be found in the zygote after fertilization
Answers
xygote is the ancient egypt rural palce
What molecules in the cell membrane help move molecules from a low to a high concentration gradient?
Answers
Answer:
In simple diffusion, small noncharged molecules or lipid soluble molecules pass between the phospholipids to enter or leave the cell, moving from areas of high concentration to areas of low concentration (they move down their concentration gradient).
Explanation:
1) What are estuaries? 2) How/why do shallow estuary waters create unique habitats for organisms living here? 3) How does the salinity in water change as you move from inland areas out towards the ocean? Be sure to include the phrase "brackish waters" in your response . 4) List 4 ways estuaries provide protection for inland areas. 5) How does dredging impact fish living in an estuary? 6) How could too many nutrients impact the natural balance in an estuary? 7) List and describe 3 ways the land terrain change as we move from Charlotte, NC to the coastal plains of North Carolina ) List 4 ways estuaries provide protection for inland areas. 9) List 5 factors that can change the flow of water through an ecosystem 10)List and describe 4 reasons estuaries are important for both wildlife and human activity
Answers
Answer:
Estuaries is a water body where freshwater from rivers and streams combines with salt water that is coming from the ocean.
Explanation:
Estuaries is a type of water body that is partially enclosed present at the coastal side where freshwater from rivers and streams combines with salt water that is coming from the ocean. Shallow estuary waters create unique habitats for organisms living there because the presence of brackish water refers to the mixture of fresh water draining from the land and salty seawater. The salinity in water change as you move from inland areas out towards the ocean because the water of inland has less salt in it while water of ocean has huge amount of salt present in it so when we move from inland to the ocean salt concentration increases in it. estuaries provide protection for inland areas by filtering pollutants, prevent shoreline erosion, flooding and storm.
In the lumen of the proximal tubule, Na concentration is ________ the Na concentration inside the cells of the tubule wall.
Answers
Answer:
The correct answer is - higher than
Explanation:
In the lumen of the proximal tubule of the kidney, most of the solutes are absorbed in the form of sodium. There is a gradient of sodium ions which allows the absorption of the solutes from the lumen into the cell.
It is due to the solute or Na concentration is higher in the lumen than Na concentration inside the cells of the tubule wall. So movement of the solutes is due to the concentration gradient.
True or False? Many marine organisms depend on estuaries during at least some point of their life.
Answers
Answer:
False
Explanation:
It is false because it is not true.
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White blood cells engulf bacteria through what process phagocytes pseudopodia bacteria
Answers
Answer:
Phagocytosis
Explanation:
Read each of the sentences that describe what happens either during mitosis or meiosis. Drag each sentence into the correct box.
Answers
Mitosis occur in somatic cells while meiosis occur in the germ cells to produce gametes.
MITOSIS:
Two diploid daughter cells form that are genetically identical the parent cell.Homologous chromosomes do not pair in mitosis.In mitotic cells one row of chromosomes line up at the center.The nucleus of the cell divides only once.MEIOSIS:
Four haploid daughter cells form that are genetically different to the parent cell.Each homologous chromosome pairs after replication.Tetrads or group of four cell form and crossing over sometimes occur.Paired homologous chromosome line up across the center of the cell.Therefore, mitosis occur in somatic cells while meiosis occur in the germ cells.
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Living cells cannot use heat to provide the activation energy for biochemical reactions because
