Answer:
Explanation:
Muscle contraction is stimulated by the movement of an action potential moving along a nerve fiber to the muscles. This event follow some series of process before being stimulated.
1. The impulse arrives at the synapse and travels through the transverse tubules.
2. The muscle impulse reaches the sarcoplasmic reticulum and calcium is released.
3. Calcium floods the sarcoplasm and binds to troponin molecules leaving active sites.
4. Tropomyosin molecules bind to exposed active sites, linking actin and myosin.
5. Thin filaments are pulled over the thick filaments.
6. The muscle fiber shortens and contracts.
The steps with respect to the contraction should be shown in the correct way.
The impulse should arrive at the synapse & travel via the tubules of the transverse. The impulse of muscle reached to the sarcoplasmic reticulum & calcium should be released. The calcium foods should be treated as the sarcoplasm & bounded into the tropoinn molecules that left active sites.The binding of Tropomyosin molecules into the exposing of active sites, actin connected & myosin. Thin filaments should be pulled over to the filaments that are thick.The fiber of muscle should be short and contracts.
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During which event does the moon appear closer? a. Apogee b. Penumbra c. Perigee d. Umbra
Answer:
Hello!
Your answer must be C. PERIGEE!
Explanation:
What is a PERIGEE?
A perigee is just another word for "near Earth"...when our Moon is at the closest point ever during orbit from the centre of the Earth...
When this happens, FULL MOONS may be seen as well as significant tidal changes!
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Mutações cromossômicas diferem de mutações genéticas clássicas e me geral trazem graves desvantagens aos seus portadores, cite pelo menos 3 desvantagens com relação aos erros cromossômicos em humanos.
Answer:
Desvantagens:
sofrendo de síndromes como Kinefelter que levam à deficiência de testosterona, gerando uma diminuição na massa muscular, cabelos e aumento dos seios.
Sofrendo de distúrbios de aprendizagem, distúrbios de crescimento, distúrbios cardíacos e distúrbios da puberdade, como a síndrome de Turner.
Hipogonadismo como a síndrome do duplo Y.
Explanation:
As mutações cromossômicas são caracterizadas por serem diferentes das mutações genéticas, pois são a perda ou o ganho dos cromossomos.
Os cromossomos estão, portanto, sofrendo anomalias e sem distinção de que tipo de cromossomo será afetado, é por isso que pode afetar os autossomos, bem como os não-autossomos.
Quando os cromossomos sexuais alterados são aqueles que dão frutos ao turner e às síndromes duplas e entre outros.
Outro exemplo disso é que as pessoas que têm multiplicação do cromossomo 21 sofrem da síndrome de Down, essa síndrome consiste em triplicar o conteúdo cromossômico.
Which of the following is true about Peptidoglycan? A. Makes up the cell wall of prokaryotes. B. Folded part of the cell membrane. C. Contains genetic information. D. Fluid that fills the cell.
Answer:
answer is a
Explanation:
a
The following is true about Peptidoglycan - A. Makes up the cell wall of prokaryotes
Peptidoglycan
is a rigid envelope surrounding the cytoplasmic membrane of most bacterial species. It helps protect bacterial cells from environmental stress and helps preserve cell morphology throughout their life cycle
The major component of the bacterial cell wall is peptidoglycan or murein.gives the cell shape and surrounds the cytoplasmic membranemade from polysaccharide chains cross-linked by unusual peptides containing D-amino acids.Thus, The following is true about Peptidoglycan - A. Makes up the cell wall of prokaryotes
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The geographic isolation of a population from other members of the species and the subsequent evolution of reproductive barriers between it and the parent species describes ________ speciation
Answer:
The correct answer is - allopatric speciation.
Explanation:
The isolation of two populations of the same species from one another due to the geographic changes this type of speciation or isolation known as allopatric speciation.
Speciation is the slow process in which the preexisting population of one species evolved to new species. Allopatric speciation, also known as vicariant speciation or geographic speciation,
Thus, the correct answer is - allopatric speciation.
What is endocrine system? What are its functions? Name the important endocrine glands present in a human body. Draw a labelled diagram to show the positions of these endocrine glands in the human body (male/female)
Answer:
endocrine system produces hormones required to coordinate reactions in the body.
WILL GIVE BRAINLIEST Compare and contrast bacterial and eukaryotic ribosomes.
Answer:
Ribosomes. Eukaryotic ribosomes are larger. They consist of a 60S large subunit and a 40S small subunit, which come together to form an 80S particle having a mass of 4200 kd, compared with 2700 kd for the prokaryotic 70S ribosome. The 40S subunit contains an 18S RNA that is homologous to the prokaryotic 16S RNA.
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Along the length of a river, there exists a species of green sunfish. In order to provide electricity to area homes, a hydroelectric dam is built that separates the lower river area from a newly formed lake above. After many, many years, the green sunfish in the river and lake are sampled and found to be very different. Which of the scenarios listed below is the best hypothesis to explain the changes observed?
a. directional selection.
b. disruptive selection.
c. stabilizing selection.
d. sexual selection.
Answer:
b. disruptive selection.
Explanation:
Due to technical difficulties, you will find the explanation section in the attached file
In each of the three systems, determine the state of entropy (low or high) when comparing the first and second: i. the instant that a perfume bottle is sprayed compared with 30 seconds later, ii. an old 1950s car compared with a brand new car, and iii. a living cell compared with a dead cell.
a) i. low, ii. high, iii. low
b) i. low, ii. high, iii. high
c) i. high, ii. low, iii. high
d) i. high, ii. low, iii. low
Answer:
a) i. low, ii. high, iii. low
Explanation:
What is difference between a nerve cell and a general animal cell
Explanation:
A nerve cell or "neuron" is different because it has a more specialized structure of communication using synapses, axons, dendrites and chemicals that allow it to use an electrochemical communication method via neurotransmitters.
However, like "general cells" they too have membranes, nucleus etc
A scientist thinks that a certain chemical is a mutagen. She exposes plant cells to a large amount of this chemical in the laboratory.
Which statement best provides evidence that the substance is a mutagen?
The cells die within hours of being exposed to the chemical.
The cells grow more quickly than those that were not exposed to the chemical.
The cells change after being exposed to the chemical, and this change is passed to the next generation of cells.
The cells continue to divide at the same rate as before they were exposed to the chemical.
Answer:
The cells change after being exposed to the chemical, and this change is passed to the next generation of cells.
Explanation:
A mutation is any change, whether big or small, that occurs to the nucleotide sequence of a gene in a cell as caused by mistake during replication or induced by a mutation causing substance. These mutation-causing substances are called MUTAGEN.
A MUTAGEN is any substance that causes genetic mutation in an organism's cell. These changes in the nucleotide sequence can affect one or more phenotypic characteristics of the affected organism, which is also passed to offsprings because it is a genetic change.
Hence, a plant cell exposed to this mutagen will be induced to mutate.
Hence, the cells changing after being exposed to the chemical, which is also passed to the next generation of cells best provides explanation that the chemical is a MUTAGEN.
Answer:
C
Explanation:
did on test
The cell theory was first proposed in 1838. Evidence obtained through additional scientific investigations resulted in the current cell theory. Which statement describes a component of the original cell theory that was removed because of the new scientific knowledge?
Answer
The correct answer is option D, that is, cell produce through the spontaneous generation.
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It is now recognized that life originates from prior life and that cells originate from preexisting cells as a result of experiments and the discovery of the microscope. Thus, option D is correct.
What is original cell theory?All living things are made up of one or more cells, which is one of the three principles of the cell theory. The fundamental unit of structure and organization in organisms is the cell.
While doing studies on tissues in the late 1830s, zoologist Theodor Schwann and botanist Matthias Schleiden proposed the united cell theory.
The unified cell theory states that each living thing is composed of one or even more cells, every cell is the basis of life, and new cells can be created from existing cells.
Therefore, cell produce through the spontaneous generation.
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what is the difference between an organ and organelle
Explanation:
Think of an organelle as a microscopic organ.
An organ is exponentially like your liver.
An organelle is kind of the same concept except it's inside of a cell.
Which is not something that occurs in translation? A codon and an anticodon pair. A peptide bond is created. A molecule of mRNA is formed. An amino acid is added to a polypeptide.
Answer:
A molecule of mRNA is formed.
Explanation:
Translation is the second process that occurs in gene expression. It is the process by which the information encoded in the mRNA transcript is used to synthesize a protein.
The mRNA nucleotide sequence is read in a group of three nucleotides called CODON. Each codon specifies an amino acid. Translation, which occurs in the ribosomes (cytoplasm), reads the codon with an anticodon using the complementary base pairing rule i.e. A-U, G-C. This means that a CODON-ANTICODON pairs.
The anticodon carries a corresponding amino acid to the polypeptide sequence. A peptide bond is formed when two amino acids joins together in a condensation reaction.
Note: A molecule of mRNA is formed during transcription
Answer:
A molecule of mRNA is formed.
Explanation:
Translation is the second process that occurs in gene expression. It is the process by which the information encoded in the mRNA transcript is used to synthesize a protein.
While studying a newly discovered prokaryotic organism, you notice that it uses binary fission to multiply. Based on your knowledge of the structures and processes of eukaryotes and prokaryotes, predict how this form of division would differ from mitosis and meiosis.
Answer:
Binary fission is different from mitosis and meiosis because it occur in prokaryotic cells. And prokaryotic cells does not have nucleus like the eukaryotic cells and there is not mitotic spindle formation during binary fission compared to mitosis and meiosis.
Explanation:
Binary fission is a process of cell division where a single cells divide into two or more parts and the parts regenerate into another organisms which resembles the parent organisms. This occur only in prokaryotic cells and is very different from mitosis and meiosis that occur in eukaryotic cells because prokaryotic cells lack nucleus and no spindle formation in the nucleus.
Mitosis occur in eukaryotic cells because they have nucleus and membrane bound organelles and is the process where a parent cell divide to produce two daughter cells that are genetically identical to the parent cell and each cell having the same number of chromosomes of the parent cell.
Meiosis is a type of cell division that occur in eukaryotic cells and it occur in sex cells where a single cell divide into four daughter cells with each having half number of parent cell chromosomes.
8. A forest is home to a large population of flies with high genetic diversity. A nearby factory
has released pollution into the forest. How can genetic diversity help the fly population survive
pollution? (4 points)
Will give brainliest
Answer:
Genetic diversity can and will allow the flies to adapt differently, and learn how to survive with the pollution in the air. There may also be different traits that help them survive the pollution.
Explanation:
If they were all the same they could be quickly killed off and may never have the chance to adapt the the changing environment around them.
Answer:
Genetic diversity can increase the chance of the fly's population to better adapted or resistant to pollution.
Explanation:
Genetic diversity refers to the variation among the genes contained in a particular species or organism.
Genetic diversity will help the fly population to survive an exposure to pollution from a factory by increasing their adaptation to the pollution. It is very likely that some of the fly population would contain allelic variation that will help them resist the effect of pollution in the forest. The surviving flies will produce off springs that will carry the set of resistant genes.
. There are different methods of sowing the seeds. Which one of the methods given below is not the methods of sowing seeds used by the farmer?
Answer:
A) Broadcasting B) Seed-drill
Explanation:
Options of sowing seeds are given below.
A) Broadcasting B) Seed-drill C) Transplanting D) Scattering E) None of these
Farmers used two methods for sowing of seeds such as broadcasting and seed drilling. Broadcasting is a method of seed sowing in which seeds are scattered in the field by hands or machines while seed drill is another method of sowing in which a device or machine is used which bury the seed at certain depth and at proper position in the field. In seed drilling method, seeds are sowing in lines while in broadcast, seeds are sown in every part of the field.
What would happen if the Earth lost all gravity for 5 seconds? What would happen if Earth's gravity became as big as Jupiter for 5 seconds?
Answer:
if it lost or gained all life would end
Explanation:
lost for five seconds
1:all things not firmly attached to the ground would start to float eg cars ships people or mid air floods
2;the atmosphere would drift into space causing lack of enough oxygen
3:the Earth's crust starts to expand outwards causing earthquakes and volcanic eruptions etc
4:the earth would drift away
if was like Jupiter's
1:all the blood in your body would pool at the bottom making the heart work harder to supply blood to other areas
2:the earth crust would start moving inwards therefore collapsing from the inside out
3all the satellites in the orbit would come crashing down etc
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Peter and Kim both earn the same amount,£18000p.a.Peter gets a pay rise of 4% in January and then a pay rise of 5% on his new salary in July.Kim gets 9% in July Peter says After July we will both be earning the same again.Is he correct? Explain your answer.
sorry guys its maths
Select the correct answer.
In the three domain system, the domain Eukarya consists of all organisms that have which of the following
Options are not provided in the question, so the complete question is as follows:
In the three domain system, the domain Eukarya consists of all organisms that have which of the following?
A. Contractile vacuole
B. Nucleus
C. Chloroplast
Answer:
B. Nucleus
Explanation:
The three domain system include archaea, bacteria, and eukarya.
Eukarya, consists of all organisms whose cells have a nucleus. Eukarya contains multicellular and visible organisms, such as animals, people, plants and trees.
Bacteria and arachaea contains unicellular organisms and lack a nucleus.
Hence, the correct option is B. Nucleus.
Which of the following is true? Seminal fluid is composed of semen and sperm. Sperm are composed of seminal fluid within a cell membrane. The three ingredients of ejaculate are sperm, semen, and prostate-specific antigen. Semen is composed of seminal fluid and sperm.
Answer:
The correct option is D: "Semen is composed of seminal fluid and sperm"
Explanation:
The semen is ejaculated from the male reproductive organ. It contains sperm cells and seminal fluid. The seminal fluid provides the energy source (fructose sugar) for the sperm to be able to swim towards the female's egg in order to fertilize it.
Which one of the following statements about lysosomes is incorrect? If one of the many types of acid hydrolases found in the lysosome is nonfunctional, a lysosomal storage disease can develop. Lysosomes are acidic because they contain acid hydrolases. Lysosomes release the monomeric building blocks (like amino acids and nucleotides) into the cell. Autophagosomes form in the cytosol around old or broken down organelles; later, the autophagic vesicle fuses with a lysosome. Resident lysosomal proteins display a mannose-6-phosphate group which targets them to a late endosome.
Answer:
B. Lysosomes are acidic because they contain acid hydrolases.
Explanation:
Lysosomes are small cell organelles that float outside nucleus. Lysosomes are present in the cytosol of the cells.
Lysosomes are acidic in nature having pH below 5 because of proton pumping through the plasma membrane to maintain this acidic pH.
This acidic nature of lysosomes play a role in fight against diseases.
Hence, the correct option is "B".
Phylogeny is the type of classification that names and identifies different organisms primarily by their: A. Physical similarities B. Similarity to humans C. Physical differences D. Evolutionary relationships
Answer:
D. Evolutionary relationships
Explanation:
phylogeny describes the relationships of organisms which evolved on most closely related species
Phylogeny is the type of classification that names and identifies different organisms primarily by their evolutionary relationship. The correct option is D.
What is phylogeny?Phylogenetics is the analysis of the evolutionary history and interactions between or within organism groups in biology.
Phylogenetic inference methods that concentrate on observed heritable traits, including such DNA sequences, protein amino acid sequences, or morphology, are used to determine these relationships.
Thus, the correct option is D.
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Humans developed this because it helped them stay alive by restricting the amount of information processed by the brain and scanning the scene before them quickly, looking for movement or physical threats. Group of answer choices Stereoscopic Visiion Binocular Vision Selective Vision Linear Perspective
Answer:
Binocular vision
Explanation:
Vision can be explained as an ability to see directly some things that can be a threat or of benefits . It can also be explained as the ability to sense or perceive threat or danger, or something good.
In this case, binoculars vision is a situation of sensing threats or dangers from a very distant place through the help of the brain. Most times, the brain will be able to sense dangers from the interpretation it gathered from what it saw earlier, before the person is involved in the act.
How can ocean pollution be controlled?
Answer:
You could start a group and pick up trash from the ocean and inform people that if we throw trash in the ocean sea animals can die and the ocean will be dirty and one day we will have no water left to drink if all water is dirty
Explanation:
No explanation
5000 Thailand natives were tested for their MN blood grouping. This allele has incomplete dominance and analysis indicated a phenotypic distribution of 600M, 4000MN, 400N. What is the frequency of the N allele?
Answer:
0.28
Explanation:
This allele has incomplete dominance and analysis indicated a phenotypic distribution of 600M, 4000MN, 400N.
Using p+q = 1
Where q is the frequency of the N allele-
400N/5000 = 0.08 is the genotypic frequency out of 5000 in total - q²
Thus the frequency of the allele N is √q² = √0.08 = 0.28
The frequency of the N allele is 0.48
What is incomplete dominance?Incomplete dominance occur when a progeny of a particular parents gives or have a phenotype that combines both parents gene.
This phenotype is intermediate of the two parents and often unique.
Total population of Thailand= 5000
Allele P= 600M
Allele pq= 4000MN
Allele Q= 400N
According to hardyweingberg principles,
P+Q= 1
p2+2pq+q2=1
Therefore, to calculate frequency of allele N in the population we have;
N for Q= 400/5000=0.08
N for pq= 4000/5000=0.8
since pq contain both allele q and p in equal proportion we have
N for pq= 0.5*0.8 = 0.4
Frequency of N in allele N and MN is
0.08+ 0.4 = 0.48.
Therefore, the frequency of the N allele is 0.48
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Please give me the answers to these
Answer:
1 d
2 c
3 d
4 b
5 b....
..........
Complete the punnet square cross. 12 points. Will give brainliest.
Answer:
See below
Explanation:
The traits are:
Tall (T)
Green (G)
Short (t)
Might be yellow (g)
Let's make a Punnet square for it and determine the possible offspring and also their ratio!
See the punnet square.
The same genotypes are denoted by the same color.
So the ration of Genotypes are TTGG (Tall green) : TTGg (Tall green) : TtGg (Tall Green) : Ttgg (Tall yellow) : TTgg (Tall yellow) : ttgg (Small yellow) is 4:4:4:2:1:1
So, the total ratio of Tall green to Tall yellow to Small yellow is 12 : 3 : 1
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How does gene flow affect the fitness of a population?
Answer:
It depends on their genes, like some people cant stop gaining weight and some people can just eat and not gain weight because of their high metabolism. Everyone has different genes that runs through their family that affects their body physically.
Explanation:
Complete each statement with the correct term from the drop-down menu.
Many molecules are moved through the body by
.
provide structure for plants.
determine what people look like.
Cells are surrounded and protected by
.
speed up chemical reactions in the body.
Hemoglobin, a protein, is built by
.
The human body is insulated by
Answer:
1. Proteins
2. Carbohydrates
3. Nucleic acids
4. Lipids.
5. Proteins
6. Nucleic acids
7. Lipids
Correct on edge 2020!!!
importance of science in everyday life
Explanation:
Science is very important in every activities of our daily life. some of them are,
It is used for cooking as the cooking materials are made with various science ideas.It is used for buying and selling purposes such as measuring amounts of quantities.It is used for lightning our house and also run various type of electronic devices to make our life effective through electricity. We use science in medical sector as all the requirements in medical sector needs the knowledge and skill of science from medicine to surgery. when we make compost manure, there should be bacteria todecompose it.hope it helps..
Answer:
sicience is in our everyday life. It is important to understand how science is incouprated in our every day life.