The options are missing from the question,the missing options are;
a. Anaphylactic
b. Histamine
c. Immediate allergic
d. Delayed allergic
e. B-cell mediated.
The correct answer to the question is option D
DELAYED ALLERGIC.
Delayed allergic response is a type of late response to antigen that occurs 48-72hours after exposure to an antigen.
This type of allergic response is mediated by T-cells and macrophages.
They are otherwise known as delayed hypersensitivity response/reaction.
The response is delayed because there is sensitization upon first exposure to the antigen, therefore if there is a re-exposure,a secondary cellular response is initiated triggering the actions of the already sensitized T-cells and macrophages.
briefly outline how cell theory has developed over the past 400 years
Explanation:
The cell theory, or cell doctrine, states that all organisms are composed of similar units of organization, called cells. The concept was formally articulated in 1839 by Schleiden & Schwann and has remained as the foundation of modern biology. The idea predates other great paradigms of biology including Darwin’s theory of evolution (1859), Mendel’s laws of inheritance (1865), and the establishment of comparative biochemistry (1940).
First Cells Seen in Cork
While the invention of the telescope made the Cosmos accessible to human observation, the microsope opened up smaller worlds, showing what living forms were composed of. The cell was first discovered and named by Robert Hooke in 1665. He remarked that it looked strangely similar to cellula or small rooms which monks inhabited, thus deriving the name. However what Hooke actually saw was the dead cell walls of plant cells (cork) as it appeared under the microscope. Hooke’s description of these cells was published in Micrographia. The cell walls observed by Hooke gave no indication of the nucleus and other organelles found in most living cells. The first man to witness a live cell under a microscope was Anton van Leeuwenhoek, who in 1674 described the algae Spirogyra. Van Leeuwenhoek probably also saw bacteria
The cell theory, states that all organisms are composed of similar units of organization, called cells.
What is cell theory?The concept of cell theory was in 1839 by Schleiden & Schwann which leads the foundation of modern biology. Cell theory states that every cell is generated from another preexisting cell.
This idea makes the great revolution in biology including Darwin’s theory of evolution (1859), Mendel’s laws of inheritance (1865), and the establishment of comparative biochemistry (1940).
Schleiden & Schwann propose every organism is composed of the cell, which is the basic unit of life and each cell comes from the preexisting cell, and each cell produces a progeny which is similar to its parent cell.
Therefore, cell theory states the existence of the cell in the organism.
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What would happen if sex cells were diploid?
A. They would require 2 other gametes to fuse with.
B. When they fused, the resulting embryo would have double the amount of DNA it should
have.
C. When they fused, the resulting embryo would have half the amount of DNA it should
have.
D. Sex cells are diploid.
If the gametes will be diploid then on fusing the resulting embryo would have double the amount of DNA it should have. The correct option is B.
What are gametes?A gamete is an animal or plant procreative cell. Female gametes are known as ova or egg cells in animals, while male gametes are known as sperm.
Ova and sperm are haploid cells, with only one copy of each chromosome in each cell. A sperm and an ovum combine during fertilization to form a new diploid organism.
As in case of diploid gamete, the embryo will have double amount of DNA than normal and will create defect.
Thus, the correct option is B.
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In ______ immunity the individual produces antibodies against particular pathogens while in ______ immunity the individual is given specific antibodies against a pathogen. Group of answer choices
Answer:
The correct answer is - active and passive.
Explanation:
Immunity is the capability of multicellular organism to protect itself from harmful molecules that are foreign to the body such as microorganism and antigens. Immunity can be active immunity or the passive immunity.
Active immunity takes place when one's own body produces antibodies to fight against a particular disease or antigen by immune system where as passive immunity occurs when an individual receives antibodies from outside and produced outside.
Thus, the correct answer is - active and passive.
A country's ecological footprint can be calculated by multiplying its population size by the footprint of each individual. Why are some ecologists concerned about the ecological footprint of a country like India
Answer:
Ecological footprint estimates the requirements of renewable resources that a population consumes to live a particular lifestyle. Some ecologists are concerned because the result of the ecological footprint shows that the demand of the population is increasing in comparison to the supply of nature.
For example in India, the ecological footprint shows negative impact of population demand over supply of nature.
Based on fossilized evidence, there are scientific claims made about the evolution of certain species. If a scientist studying the fossils of a specific species had a hypothesis other than what was currently accepted, what steps should be taken to have the alternative hypothesis considered
Answer: For the scientist to have alternative hypothesis considered, it is imperative he takes certain steps, this steps will ascertain the scientific claims already made about the evolution of species.
Therefore,the scientist will simply test the alternative hypotheses inorder to know that they are incorrect.
This testing of hypotheses to ascertain their incorrectness is very useful in the study of fossils.
Match the causes with their effects.
Answer:
"destroys->deforestation"
"Oil spills->harms aquatic"
"injecting->pollutes"
1. deforestation
2. injecting fracking fluids into the ground
3. oil spills during transport on a ship
Abnormal vascular regulation by endothelial cells in small vessels of the heart contributes to:___________. a. Hypertension b. Dysrhythmias c. Truncus arteriosus d. Ischemic heart disease
Answer: The correct answer to the question is option D
ISCHEMIC HEART DISEASE.
Explanation: To answer the question effectively, let us look at the options given,what they are and how they affect the heart.
Endothelial cells play a crucial role in the regulating vascular tone,They do so by secreting variable amounts of constricting and relaxing factors inorder to control tissue perfusion.
Hypertension on the other hand occurs as a result of factors that varies distinctively and not all related to vascular tone.
Dysrhythmias on it's own will affect the function and conduction of heart chambers but not necessarily vascular tones.
Truncus arteriosus results in only in one large artery exiting/leaving the heart.
is blood a collodial type
Answer:
yes
Explanation:
The cells in blood are far larger than 500nm (Red blood cells: 6000-8000nm, white blood cells: 7000-21000nm, platelets: 2000-3000nm) and so they sit in the plasma as a suspension. The plasma also contains blood plasma proteins which are between 2-500nm and so they form a colloid in the water.
Answer:
The cells in blood are far larger than 500nm (Red blood cells: 6000-8000nm, white blood cells: 7000-21000nm, platelets: 2000-3000nm) and so they sit in the plasma as a suspension. The plasma also contains blood plasma proteins which are between 2-500nm and so they form a colloid in the water.
Hope this helps!!
Explanation:
Analogies are often used to help make concepts easier to understand. Trisha wants to write an analogy to help her remember the difference between the axial skeleton and the appendicular skeleton. Which is the best analogy? ~The axial skeleton is like the skin of an apple; the appendicular skeleton is like the core of an apple. ~The axial skeleton is like the core of an apple; the appendicular skeleton is like the skin of an apple. ~The axial skeleton is like the frame of a swing set; the appendicular skeleton is like the swings. ~The axial skeleton is like the swings on a swing set; the appendicular skeleton is like the frame of a swing set.
Answer:
The correct answer is - The axial skeleton is like the frame of a swing set; the appendicular skeleton is like the swings.
Explanation:
The axial skeleton is the part of the human skeleton system that supports and protects vital organs of the body and makes a frame for the body structure that include bones of skull, trunk rib cage and ribs. The axial skeleton system is like a frame of a swing set that holds the swings and provide support to the swings.
On the other hand, The appendicular skeleton is like the swings of the of the swing set that can move and provide motion to the body, upper body limb, shoulder girdle and lower limb and pelvic girdle are the bones of appendicular skeleton.
Thus, the correct answer is - The axial skeleton is like the frame of a swing set; the appendicular skeleton is like the swings.
Answer:
C - Axial skeleton is like the frame of a swing set
Explanation:
Antibodies:_______. A. play a large role in cell-mediated immunity. B. are produced by both T and B cells. C. are composed of four light and four heavy polypeptide chains. D. are not specific, but act generally. E. have a variable region that binds to a specific antigenic determinant.
Answer:
E. have a variable region that binds to a specific antigenic determinant.
Antibodies E. have a variable region that binds to a specific antigenic determinant.
What is the region of the antibody that the antigen binds to?This location of the antibody is known as the Fab (fragment, antigen binding) place. it's far composed of 1 constant and one variable domain from every heavy and light chain of the antibody. The paratope is shaped on the amino terminal cease of the antibody monomer by the variable domains from the heavy and light chains.
What binds to an antigenic determinant?An antigenic determinant is a website online of an antigen molecule that is termed an epitope and interacts with the unique antigen-binding site within the variable vicinity of an antibody molecule called a paratope.
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What is the definition of salinity ?
Answer:
Salinity pertains to the degree of saltiness or the relative proportion of salt in a solution. ... By definition, salinity in relation to limnology refers to the total amount of dissolved solids in water in parts per thousand by weight.
Answer:
Salinity is the saltiness or dissolved inorganic salt content of a body of water. Substances that are dissolved in water are usually called solutes.
Explanation:
how to minimize flood
Answer:
some of the ways are...
Explanation:
establishing strong damavoiding construction around water resources properly utilizing and storing rain water for future useflood cannot be stopped totally as it is the effect of nature but its effects can be minimized by using our scientific knowledge and methodswhat is the hypothesis
Answer:
a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.
Explanation:
Answer:
what you think is gonna happen in an experiment
Explanation:
The diagram shows a straight chain of glucose molecules.
Which carbohydrate is shown above?
O fructose
O sucrose
O galactose
Ostarch
Answer:
Starch
Explanation:
Starch is a polysaccharide composed of many glucose molecules linearly arranged.
---------------------------------------
Fructose, sucrose, galactose, and glucose are carbohydrates. They are organic compounds with H, C, and O. Their functional groups are hydroxyl (-OH) and carbonyl (-C=O).Galactose, fructose, and glucose are isomeric monosaccharides, with the formula C₆H₁₂O₆.
Sucrose is a disaccharide composed of glucose + fructose. The formula is C₁₂H₂₂O₁₁.
Glucose is the most abundant carbohydrate. The main source of glucose is vegetable starch.
The starch molecule is composed of many glucose molecules joined.This is a linear polysaccharide that can acquire a tridimensional helicoidal conformation. Each of the helices turns consists of six glucose molecules. In the interior of the helix, there are only hydrogen atoms. Hydroxyl groups are facing the exterior.
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Which describes a grizzly bear’s habitat? all the biotic factors in the ecosystem all the abiotic factors in the ecosystem the role of the bear in the ecosystem the physical area where the bear lives
Answer:
it is D
Explanation:
A grizzly bear’s habitat comprises of the physical area where the bear lives
What is a habitat?A habitat is defined as the dwelling home of living organisms.
There are three major types of habitat; namely:
Terrestrial habitatAquatic habitatArboreal habitatTerrestrial habitat is the land habitatAquatic habitat is the water habitatArboreal habitat is the tree habitatLearn more about habitat:
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2) Micah and Taylor investigate the effect of tap water and spring water on the growth of plants.
They grew two plants of the same type and size in separate containers. Every three days, they
added the same amount of tap water to one plant and the same amount of spring water to the
other. Describe an action that would best improve the reliability of their results?
Answer:
To improve the reliability of the results, the nutritional component of each category of water must be tested and recorded.
Second, the experiment should be carried out under greenhouse conditions.
The above actions will afford more control. When an experiment is controlled, it means that except for the dependent variable, all other variables are kept constant by the scientist.
By performing the experiment under greenhouse conditions, the kind of water the plants receive, temperature and other biotic actors are kept within measurable limits thus increasing the reliability of the results.
Cheers!
Sebastian wants to make ball-and-stick models of the four macromolecules. He has colored balls for each of the elements in these molecules, including the following. red: hydrogen black: carbon purple: oxygen green: nitrogen Which molecule could he make that consists of long chains of red and black colored balls? carbohydrates lipids nucleic acids proteins
Answer:
lipids
Explanation:
There are four major biological macromolecules in living systems viz: carbohydrate, proteins, lipids and nucleic acids. These macromolecules play a significant role in the optimal functioning of every living organism. Like every other polymer, these macromolecules are made up of simpler units called monomers that defines their chemical structure. In turn, the monomers consists of chains of chemical elements held together.
According to the question, Sebastian has colored balls that represents the elements contained by each of these macromolecules. The colored balls and the elements they represent are as follows: Red: hydrogen, Black: carbon, Purple: oxygen, and Green: nitrogen.
Lipids are structurally made up of fatty acids and glycerol, which are long chains of carbon and hydrogen elements with a relatively small percentage of oxygen in the structure. An example is palmitic acid, which has a structural formula: CH3(CH2)14COOH
Hence, Sebastian could make a LIPID macromolecule, which consists of long chains of red (hydrogen) and black (carbon) balls since lipids are mostly made up of carbon and hydrogen elements in their structure.
Carbohydrates are composed of more percentage of oxygen in their structure. Hence, a long chain of only red (hydrogen) and black (carbon) balls cannot make them. Proteins and nucleic acids are made up of additional nitrogen and phosphorus elements in their structure.
Answer:
B. Lipids
Explanation:
Lipids contain carbon and hydrogen.
what are the challenges faced by the role of climate on crop production?
Answer:
Climate on crop production contribute to the greenhouse effect and climate change and impacts on agriculture production.
Explanation:
Crop production of climate change is likely to change food security in the future, all people and economic to sufficient and safe an active life.
Climate change is to contribute to food prices and food production, and expensive climate change increase energy prices,production may increased crop water and suitable production.
Agriculture and food product system is a major process source of gas,could increase products,yield of crop restricted by the extreme events.
Productivity can also effects on the immune system them certain diseases,in animals are productivity and fertility.
Crop level to climate change is expected be in future changing crop irrigation practices,crop production under global change.
Climate change extreme events have been and strategies suggest to help maintain production and restoring farm type, crop, food systems, crop that stress tolerance.
Jameson lives in a city on the shores of the Atlantic Ocean. The temperature fluctuations are relatively small in his city because takes longer to heat up and cool down due to its high .
Answer:
Water, high specific heat capacity
Explanation:
The temperature fluctuations are relatively small in Jameson city because takes water longer to heat up and cool down due to its high specific heat capacity because water has high heat capacity that is it absorb alot of heat before it start to get hot. takes more energy to increase the temperature of water compared to other substances which help to regulate extremes in the environment.
Water surrounding cities take longer to heat up and longer to cool down so cities that are near the oceans will tend to have less change and less extreme temperatures compared to inland cities.
Answer:
I believe it's (water and specific heat) let me know if this is correct :)
why is it necessary yo separate oxgynated and deoxgynated blood in livng oranisum
Explanation:
it is necessary in mammals and birds to separate oxygenated and deoxygenated blood because this makes their circulatory system more efficient and helps in maintaining a constant body temperature
What is absorbed into the blood stream in small intestine and large intestine
If capeland switches from producing 0 watermelons to producing 18 million tons of watermelons, what does it give up?
Answer:
Attached to this solution is an image of the complete question and data.
The correct answer is:
6 million pairs of shoes
Explanation:
From the diagram attached to this answer, the following data can be gotten:
Watermelons shoes
(Millions of tonnes) (Millions of pairs)
0 15
8 14
14 12
18 9
20 5
21 0
From the pattern of the data shown above, we notice that as the production of one commodity increases, the other is given up (decreases)
Therefore, to find how much shoes are given up if Capeland switches from 0 watermelons to 18 million tons of watermelon, we will find the difference between the number of shoes produced at 0 and at 18 million tons of watermelon
at 0 watermelon; shoes = 15 million pairs
at 18 million tons of watermelon; shoes = 9 million pairs
Therefore, number of shoes given up = 15 - 9 = 6 million pairs
Hence, 6 million pairs of shoes are given up tp increase production of watermelon from 0 to 18 million tons
30 POINTS PLZ HELP I WILL GIVE BRAINLIEST Identify and describe the two main methods for measuring the age of Earth and its parts.
Answer:
Radiation Measurement.
Stratigraphic Superposition.
The Fossil Record.
Explanation:
Answer:
Radiation Measurement.
Stratigraphic Superposition.
The Fossil Record.
Explanation:
how does the cell wall contributes towards maintaining homeostasis in the cell
Answer:
The water wants to flow from the higher concentration, which is outside of the cell, to the lower concentration, which is inside of the cell. The cell membrane helps to regulate and slow down the flow of water into the cell. This is yet another way that the cell membrane helps maintain homeostasis.
I hope it helps ❤️
What happens when volcanoes release greenhouse gases into the atmosphere?
Answer:
a. the climate gets warmer...
Explanation:
When volcanoes release greenhouse gases into the atmosphere, global warming is due to the greenhouse effect.
What do you mean by the Greenhouse effect?The Greenhouse effect may be defined as the phenomenon of keeping the earth warm due to the presence of certain gases in the atmosphere.
Greenhouse gases like carbon dioxide, Methane, and Nitrous oxide allow the solar radiations to enter but prevent the escape of heat radiations of longer wavelength.
Due to this, the gradual and continuous increase in the average temperature of the earth's surface occurs, a phenomenon known as global warming.
Therefore, when volcanoes release greenhouse gases into the atmosphere, global warming is due to the greenhouse effect.
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One side of your face is identical to the other side. You are _____. radially symmetrical asymmetrical bilaterally symmetrica
Answer:
For the answer to the question above, asking if One side of your face is identical to the other side. Then you are bilaterally symmetrical.
I hope my answer helped you. Feel free to ask more questions. Have a nice day!
Explanation:
Answer:
Bilaterally symmetrical
Explanation:
From my understanding, radially symmetrical means identical halves around the central axis.
Asymmetrical means not symmetrical at all
Leaving us with Bilaterally symmetrical, which is basically identical parts but as right and left.
That's the best i can explain so there is a diagram to help understand.
Which label in the graphic represents the energy that is released from glucose by cellular respiration?
Oxygen
Glucose
Energy stored as ATP
Carbon dioxide and water
Answer:
C) Energy stored as ATP
Explanation:
100% on edge
You experimentally apply a toxin to a muscle and find that it does not contract when you electrically stimulate the motor neuron leading to it. You know that this toxin blocks acetylcholine receptors. Therefore, you suspect that the stimulation of contraction is failing because: Group of answer choices
The question provided is not complete as it lacks the group of choices, however the group of choices are given as follows:
A. A contraction fails to occur because an action potential is not generated in the muscle cell.
B. A contraction fails to occur because this toxin directly prevents ion release from intracellular stores.
C. A contraction fails to occur because neurotransmitter release by the motor neuron is blocked at the neuromuscular junction.
D. A contraction fails to occur because this toxin prevents cross bridge formation and thereby directly prevents contraction.
E. C and D are both true
Answer:
The correct answer is option A : A contraction fails to occur because an action potential is not generated in the muscle cell.
Explanation:
A muscle contraction takes place when action potential bring to muscles by nerves, which is traveled with the help of motor neuron and imitated the muscle contraction.
Acetylcholine or Ach is a chemical messenger to bring the nerve impulses between a nerve and a muscle. If the receptor is block with applying toxin muscle will not contract as ACh will not be able to propagate the nerve impulse to the muscle so there will be no action potential.
The correct answer is option A : A contraction fails to occur because an action potential is not generated in the muscle cell.
Which best describes a scientific theory?
A. An idea that is supported by many different experiments
B. A hypothesis that is proven true with an experiment
C. The conclusion of a single scientist about a hypothesis
D. An educated guess about an aspect of nature
Answer:
Hey there!
A theory can be best described as an idea that is supported by many different experiments.
Let me know if this helps :)
Which type of model is represented in the following image?
a
Computer simulation
b
Graph
с
Map
d
Small-scale object
Answer:
d
Explanation:
Its a map but showing the northern, southern, Eastern, and Western province of the earth.