Edxcel alevel biology past papers: some of the blood plasma of individuals who have survived infection wtih Ebola can be collected. This can be used in the treatment of individuals currentlty infected with Ebola. Explain why the blood plasma from survivors can be used to treat new cases of Ebola infection.

Answers

Answer 1

Answer:

This was the only treatment options adopted for the Ebola in  1995 in the Democratic Republic of Congo. The assumption was that immune response is generated by the virus in the WBC of the infected individuals. These response produce antibodies.

A total if 8 patients were transfused with these blood contained antibodies, but one of these died, the remaining 7 patients survived.

The antibodies were believed to  have  multiplied(produced b-cells) to neutralize the Ebola virus(antigens)  and to ensure the survival of the patients

Explanation:


Related Questions

A radioactive substance has a half-life of 1.25 million years. What is the age of a rock in which 6.25% of the original radioactive atoms remain? 5 million years old 6.25 million years old 3.75 million years old6 2.5 million years old 1.25 million years old 625 thousand years old

Answers

Answer:

The age of the rock is 5 million years

Explanation:

Fraction of radioactive substance remaining = 6.25% = 625/10000 = 1/16

Number of half-lives undergone by the substance to leave behind 1/16 of the original sample

1/16 = (1/2) * (1/2) * (1/2) *(1/2)

Therefore, the substance have decayed 4 times

One half=life = 1.25 million years

Four half-lives = 4 * 1.25 million years = 5 million years

Therefore, the age of the rock is 5 million years

What process best explains how a nerve cell and a muscle cell can both
develop from the same fertilized egg?
O A. differentiation
O B. natural selection
O C. selective breeding
O D. genetic engineering
Need ASAP!

Answers

Answer:

Im pretty sure its A.

Explanation:

=just took the teskst

Answer:  The correct answer is A. differentiation

Explanation:  Confirmed correct.

how does water boiling on a stove represent all 3 types of heat transfer​

Answers

Answer:

For example, when a pot of water is placed on the stove to boil, conduction heat warms up the pot, which then heats the water molecules inside. As these molecules heat, convection causes them to move away from the interior of the pot as they are replaced by cooler molecules.

Explanation:

If a person combat the disease without a vaccine introduced to his body,such immunity is known as

natural active immunity

natural passive immunity

Artificial active immunity

artificial passive immunity​

Answers

Answer:

natural active immunity will be the answer

please help i will mark brainliest

Answers

Answer:

The vaccine that protect humans from the h1n1 virus is called Panvax vaccine or swine Explanation:They are inactivated H1N1 virus vaccines used for immunization of individuals 6 months of age and older against influenza disease caused by H1N1 2009 virus.

how can limiting factors (density dependent and density independent) affect a population size?

Answers

Density-dependent limiting factors cause a population's per capita growth rate to change—typically, to drop—with increasing population density

The passage of genetic instructions from one generation to the next is known as what?

Answers

Answer:

heredity

Explanation:

Answer: heredity because it is

Two students completed an experiment to determine if pesticide use at local farms was causing fish kills in a local pond. The steps of the experiment are listed below. Select one location to collect water samples in the pond. Collect a 5-mL water sample at 8 am for two days. Measure the amount of pesticide present in each sample using the same measurement tools. After analyzing their data, the students conclude that pesticide runoff from farms is not causing the fish to die in the pond. Which of these statements best describes why their conclusion is not reliable? The pesticide measurements were the dependent variable. The samples were collected at different times. The samples were only collected for two days. The time of sample collection was not an independent variable.

Answers

Answer:

The pesticide measurements were the dependent variable

Explanation:

According to this question, an experiment to determine if pesticide used at local farms was causing fish kills in a local pond was conducted by two students. They followed the following steps:

- Select one location to collect water samples in the pond.

- Collect a 5-mL water sample at 8 am for two days.

- Measure the amount of pesticide present in each sample using the same measurement tools

However, after analyzing the data, they concluded that "runoff from farms is not causing the fish to die in the pond". The students' conclusion is not reliable because THE PESTICIDE MEASUREMENTS WERE THE DEPENDENT VARIABLE.

Note that, the dependent variable in an experiment is the measured variable while the independent variable is the manipulated variable. In this case, the students ought to measure the death RATE OF FISH KILLS as the dependent variable instead. The PESTICIDE is the independent variable of the experiment not dependent variable. This was the reason for the unreliability of the conclusion.

thermal energy transfer by conduction happens when heat moves from one object to another by

Answers

Answer:

Touching

Explanation:

Conduction is when you transfer energy by touching or direct

Answer:

touching

Explanation:

A diagram that shows the connections of many food chains is called a ...

Answers

Hey :)

I think it’s a ‘food web’ but honestly I’m not sure

I hope this helps anyways :)

What type of bond is being formed in this polymerization reaction to link two amino acids together?

Answers

answer : peptide bond or chemical bond between two compounds . (:

State two features of diffusion that do not apply to active transport

Answers

diffusion moves ions from high concentration to low using no metabolic energy and active transport uses metabolic energy in the form of atp to move ions from high concentration to low concentration

The energy available to consumers determined by subtracting the energy used by plants from the total energy

transformed by the process of photosynthesis.

А

et your pas

Primary productivity

B

Gross primary productivity

С

Net primary productivity

D

Cellular respiration

Answers

Answer:

C. Net Primary productivity

Explanation:

In an the food chain of an ecosystem, energy is constantly being gained and most. Producers are the set of organisms that start the energy cycle via the process of photosynthesis. The gross primary productivity (GPP) is the amount of energy that the producer is able to capture from sunlight during photosynthesis.

The rate at which that captured energy is used to produce chemical organic compounds, which served as food, is called the primary productivity of the producer. However, the NET PRIMARY PRODUCTIVITY (NPP) is the energy available to consumers, which is determined by subtracting the energy used by plants via metabolism, from the total energy transformed by the process of photosynthesis. Hence, mathematically, NPP = GPP - R

Where, R = energy lost via respiration.

A feral cat needs to eat two mice a day to survive. A mouse needs to eat 5 seeds a day to survive. How many seeds are required to feed a feral cat for a week (7 days)?​

Answers

Answer:

70 seeds

Explanation

5 is the food for a mouse  (day)x2 mice for cat=10. 10x7(week)=70 seeds

hope this helps!

Help asap!

The broadest group an organism can be classified into is its:

A. kingdom

B. domain

C. order

Answers

Answer:

B. Domain

Explanation:

In order from broadest to most specific:

Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species

Answer

Explanation:

The broadest category in the Linnaean system is the kingdom. Figure above shows the Animal Kingdom because Homo sapiens belongs to that kingdom. Other kingdoms include the Plant Kingdom, Fungus Kingdom, and Protist Kingdom. Kingdoms are divided, in turn, into phyla (phylum, singular)

How far does a runner travel if they maintain a speed of 8.5 m/s for 240 s?

Answers

The answer is "2,040 m"
the answer is 2,040 m/s

All human body cells contain 46 chromosomes. However, sperm cells in men and egg cells in women have only 23 chromosomes. This is due to meiosis. How does meiosis accomplish the reduction in chromosomal number?

Answers

Answer:

Two cell divisions after DNA replication

Explanation:

After the DNA is replicated, the cell undergoes two rounds of meiosis to produce 4 cells, each wIth 23 chromosomes. This is how the cell goes from a diploid to a haploid state.

You need to find out why the GBR water is inhibiting (stopping) photosynthesis in the algae. The three major parts of photosynthesis are PSI, PSII and the Calvin cycle. The database has provided 3 things that could be inhibiting photosynthesis: high sea temperatures, paraquat, and diuron.

Answers

Answer:

Explanation:

The question is not complete below is the remaining part of the question

Justify your choice by writing a hypothesis to explain how it has stopped the algae from making ATP, NADPH and sugars. You will be able to revise your hypothesis as you do more experiments

Explanation:

The hypothesis will be

High sea temperature inhibit Algae growth

Herbicides reduces algae photosynthesis rate

Algae respond to temperature differently some thrive at a low temperature, some at a moderate temperature but when the temperature is very high the rate of photosynthesis will reduce because they can not undergo the normal body physiological function as a result of harsh environment. In green plant at a very high temperature stomata closes to regulate water loss this prevent Carbon dioxide from coming in and photosynthesis rate reduces

Paraquat and Diuron are herbicide that prevent the growth of plants, when they are sprayed Algae is affected they die from immediate action of this chemical and their colour changes since chloroplast the green pigment is where light hit for photosynthesis to occur when the color changes the active site is affected photosynthesis can no longer occur.

Answer:

Diuron

Explanation:

Increasing the temperature only decreases the sugar, not the ATP and NADPH. I predict that Diuron will be inhibiting photosynthesis because photosynthesis as a whole should not work if Photosystem II is interfered with. Also, because Paraquat only lowers NADPH and sugar and not ATP, Diuron is the only choice left.

Which organelle provides support for the cell and may also help the cell move?
Cell Membrane
Cytoplasm
Cytoskeleton
Ribosome

Answers

Cytoskeleton because it maintains cell's shape, secures organelles in specific positions, allows cytoplasm and vesicles to move within the cell

Information about which of the following would be most pertinent to a small organic farm that solely relies on manual labor to till, plant,
water, and harvest crops?

dehydration and heat exposure precautions

heavy equipment training and maintenance

drip irrigation installation and maintenance

hazardous chemicals storage precautions

Answers

Answer:A

Explanation:

If i had to guess its A because its the only one that doesn't require equipment, since the question said it was a small organic farm that only practiced Manuel labor.

Answer:

dehydration and heat exposure precautions

Milk sugar is a good source of;
A)galactose
B)glucose
C)fructose

Answers

The correct answer is glucose!

which cell is the only cell in a human body that could be seen with the naked eye

Answers

human egg cell


But human egg cell is the one of the largest cells in the human body that can be seen with naked eye. i.e we are able to see it without the help of a magnification device. The size of this cell is about 0.12 mm in diameter.

The speed at which waves approach the shore depends on the shoreline features and the depth of the sea floor. When a wave reaches the shore, it releases a burst of energy that generates a current which runs parallel to the shoreline. What is this current called?

Answers

Answer:

Longshore current.

Explanation:

A wave is a disturbance which travels through a material medium without any permanent displacement of the particles of the medium. During the propagation of a wave, energy is transmitted from one point to another since waves flow with energy. The higher its speed of propagation, the higher the energy of the wave.

The energy released by the wave at shore produces a current which is referred to as a longshore current.

Answer:

It would be Longshore Current

Explanation:

Hope it helps :)

Sitting down at her favorite restaurant, Aliyah is looking at the menu trying to figure out what she would like to have. She notes an asterisk next to one of the dishes and finding the note at the bottom of the menu, it says, “Although we will cook to order, be aware that consuming this dish raw or undercooked may increase your risk of contracting salmonella.” Which menu item is MOST likely being referenced here?

A. Eggs Benedict
B. Blackened Salmon
C. Chocolate Cake
D. Spinach Lasagna

Answers

Answer:

my guess is A. Eggs Benedict

Explanation:

eating eggs raw may lead to illness.

Genetic information is encoded in a linear sequences of nucleotides,
which are structures that contain

A) a sugar group, a phosphate group, and a nitrogen base
B)an amine group, a functional R group, and a carboxyl group
C)short chains of CHO
D)long chains of CHO

Answers

Answer:

B)an amine group, a functional R group, and a carboxyl group

Explanation:

Why does PE = mgh equal PE = Fw h ?

Answers

Answer:

Why is potential energy MGH?

Potential energy is energy an object has because of its position relative to some other object. ... For the gravitational force the formula is P.E. = mgh, where m is the mass in kilograms, g is the acceleration due to gravity (9.8 m / s2 at the surface of the earth) and h is the height in meters.

Explanation:

Yes Yes Yes Yes Yes Yes

⚠️ i will mark brainliest
A team of engineers is designing a new ship. The engineers first build several models of the ship. Explain in your own words why the models could help the engineers

Answers

Answer:

The model could help the engineers by giving they a prototype to build off of so they have an idea of what they ship looks like, and if the test it, they could troubleshoot and see the errors/successes of the model.

Explanation:

The engineers first build several models of the ship as the model could help the engineers by providing them a prototype to build of so that they have an idea of what or how the ship will looks like, and if they test it, they could troubleshoot and see the errors or successes of the model of the ship.

What are the fields in which science is applied?

Science has the factual based knowledge and it has about the Nature as well as the natural world that has created on the basis of observations and the experiments. It has the study of the experiments and observations and it has totally depend upon the scientific result that has obtained after the scientific experiments.

There are several fields in which science has been applied and these field are healthcare, telemarketing, environmental engineering, banking, government regulation, space, biochemistry, physics, chemistry, biochemistry and astronomy, engineering.

Therefore, The engineers first build several models of the ship as the model could help the engineers by providing them a prototype to build of so that they have an idea of what or how the ship will looks like, and if they test it, they could troubleshoot and see the errors or successes of the model of the ship.

Learn more about science here:

https://brainly.com/question/12842883

#SPJ5

can you pls help me ??​

Answers

Uhhh Photosynthesis?
photosynthesis pretty sure!

Which nitrogenous bases are considered purines?

Answers

adenine

cytosine

consider purines

Compare and contrast a few aspects of animal and plant cells. You can focus on intra- and extracellular structures they share or don't share, but also be sure to describe processes they both utilize or don't both utilize. Some things to consider: How they obtain 'food' (what is their organic carbon source?) What structures do they share that prokaryotes lack? What do they share that all living cells also share? Do they use CO2, and/or O2 in any processes?

Answers

Answer and explanation:

Although they share some similarities because they are both eukaryotes, plant cells and animal cells are quite different from each other, which is logical since they have distinct lives.

For example, animal cells and plant cells both have a cell membrane, but only the plant cells have a cell wall - which is thick and resistant, and this makes sense because they are more exposed to mechanical and osmotic stress.

Since animals can move towards sources of water but plants cannot, there's also a way in which plants store water in the cells: vacuoles. Animal cells have vacuoles as well although they are much smaller than the single huge vacuole that plant cells have.

All living organisms need the energy to sustain different cellular processes. The organelle in charge of the chemical reactions behind the obtention of energy is the mitochondria, which is present in all cells, but the mitochondrion needs a specific substrate: glucose. Glucose is obtained in diverse ways: animals move and find food that contains glucose in it, while plants produce their own glucose with a specific process called photosynthesis, for which they need an organelle called chloroplast, which animals do not have. In order to transform the glucose into energy, the mitochondria end up generating CO2, which animals expel from their bodies by exhaling. This CO2, now in the air, is used by plant cells as a substrate in photosynthesis (which needs sunlight as well) to produce glucose and also O2, that will be inhaled by animals and used by their tissues.

All living organisms have one thing in common: they possess DNA. DNA contains all of the genetic information of an organism, and it is present in almost every cell of that organism -if it happens to be a multicellular being-. While prokaryotes have their DNA condensed into a single circular chromosome, eukaryotes like plants and animals, have their DNA form many linear chromosomes (quantity varies according to the species) and these chromosomes are inside a very specialized organelle: the nucleus, which prokaryotes do not have.

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