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Marianna [84]
1 year ago
7

Experimental vs control group:

Biology
1 answer:
OLEGan [10]1 year ago
6 0

When conducting an experiment, the control group does not receive the treatment, while the experimental group is exposed to it. Individuals from both groups come from the same population.  

<h3>What are the control group and the experimental group?</h3>

During an experiment the researcher compares at least two groups: a control group and an experimental group.

Both of them are composed of individuals coming from the same population, so they are identical in all aspects except for the independent variables.

Both groups must be similar in every variable that might influence the results, except for the study treatment.

  • The control group is the one used to identify any other factors influencing the results obtained in the study, apart from the modified variables of the treatment.

It is useful to have a control group to observe how it responds when no treatment is applied.

The independent variable always keeps constant in the control group.

  • The experimental group is subjected to the effects of the treatment.

The researcher applies different treatments to the experimental groups to analyze their response.

The researcher voluntarily changes the values of the independent variable to observe how it affects the individuals subjected.

There can be several experimental groups.

In conclusion, the control group does not receive the treatment, while the experimental group does.

You can learn more about the control and experimental groups at

brainly.com/question/12999020

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Which of the following statements about secondary production is false!
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The statement about secondary production that is false is option c. Generally, an individual's production efficiency will decline as the C:N ratio of its food increases.

<h3>When is productivity and efficiency present?</h3>

Productive efficiency states that it is not possible to generate more of one good without producing less of another good given the inputs and technology at hand.

Note that Production efficiency is a word used in economics to describe the point at which an economy or other entity can no longer produce more of one good without reducing the level of production of a different one.

Hence, It's more important to focus on the caliber of your job than just the pace. Therefore, you have achieved improved production efficiency if your company increased its output from 1,000 bags to 1,500 bags of coffee while generating less waste, spending less money, and utilizing fewer resources.

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3 0
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MatroZZZ [7]

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Define the 3 signals for activation and the 3 outcomes of the complement system.\
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* More than 40 proteins and glycoproteins involved in the complement system are synthesized by the liver, macrophages, epithelial cells, they are present in the blood in plasmatic form, membrane, some have an enzymatic activity, regulator or membrane receptorThese are elements of the humoral innate immune response, they fight infections, purify immune complexes and apoptotic bodies.
<span>There are indeed three ways to activate the complement:</span>
Classical pathway: Activated by Immunoglobulins in immune complexes, aggregated Immunoglobulins, DNA, CRP, apoptotic bodies .......it involves nine fractions, starting with C1, then C4, C2, C3, to form a classical C5 convertase, then, activation of C5, C6, C7, C8, C9.

Alternative pathway: activated by polysaccharides (bacterial endotoxin), vascular wall poor in sialic acid, aggregated IgE ...C3b like is the first component in the alternate channel cascade, it will create an amplification loop, and form an alternative C5 convertase.

Lecithin pathway: Activated by mannose, fucose (carbohydrate of microorganisms)The first component is the complex MBL / MASP1 / MASP2: "mannose-binding protein": works according to the same principle as the complex C1 of the classical way (MASP2 cleaves the C4 and the rest of the cascade is equivalent to that of the classical way).

the three ways have the same outcome: A C5 convertase (formed by one of the pathways) cleaves C5 into C5a and C5b: C5b is deposited far from other fractions on the antigenic surface. The fixation of C5b in the cell is followed by that of C6, C7, C8, and C9 (9 molecules of C9): formation of the membrane attack complex (MAC) ==> Death of the cell by osmotic shock
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