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RoseWind [281]
2 years ago
13

In your own words describe three key features of a fair test

Biology
2 answers:
Ainat [17]2 years ago
3 0

Answer:

In a fair test two or more things are compared. In order for a test to be fair or scientifically sound, children are required to ensure only one thing (this is called a variable) is changed.

For example, if testing which material is the most waterproof by pouring liquid onto a selection of different materials, in a fair test only the type of material (the component you are testing) should be changed. Therefore all other elements (the type of liquid used, the amount of liquid used, the distance the liquid is poured from, the speed at which it is poured and the size of the material) must remain the same each time the test is carried out. It would be unfair or an unscientific test if, for example, 1000ml of water were poured onto a piece of foil and 2ml of milk poured onto a piece of foam – you would not be able to fairly compare the materials. 

hope this will help you!!!.....

fredd [130]2 years ago
3 0

Answer:

A fair test is a test which controls all but one variable when attempting to answer a scientific question. Only changing one variable allows the person conducting the test to know that no other variable has affected the results of the test.

Hope it helps....

Have a great day : )

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Which of the following statements best represents the theory of pangenesis developed by Hippocrates?
scoundrel [369]

Answer:

b. Particles called pangenes, which originate in each part of an organism's body, collect in the sperm or eggs and are passed on to the next generation.

Explanation:

Particles called pangenes, which originate in each part of an organism's body, collect in the sperm or eggs and are passed on to the next generation. The belief of Hippocrates states that "the semen was derived from the whole body." which means the whole body contributes the formation and creation of semen that is responsible for the fertilizing the female's egg with its sperm.

7 0
2 years ago
An enzyme that follows simple michaelis–menten kinetics has an initial reaction velocity of 10 μmol⋅min−1 when the substrate con
svet-max [94.6K]

The Vmax of the enzyme is 12 μmol⋅min−1

We use Michaelis-menten equation,  which is given by;

V=\frac{Vmax(S)}{Km+(S)} \\

Where v is velocity of reaction

Vmax = maximum rate achieved by the system

[S] = concentration of a substrate

K_{m}= Michaelis constant

Given V_{0} = 10umolmin^{-1}

[S] = 5km

Now, we calculate Vmax:

10umolmin^{-1} = \frac{Vmax*(5Km)}{Km+5Km}

Km = 1

10=\frac{5KmVmax}{6Km}

\frac{10*6}{5} =Vmax

Vmax =12 μmol⋅min−1

Learn more about Michaelis-menten kinetics here:

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6 0
1 year ago
During binary fission in a bacterial cell, a base pair is changed from adenine to cytosine. what has just occurred?
insens350 [35]

During binary fission in a bacterial cell, a base pair is changed from adenine to cytosine due to a random mutation.

Binary fission is a type of asexual reproduction through which a bacteria divides and its body is separated into two new bodies.

If during binary fission in a bacterial cell, a base pair is changed from adenine to cytosine, it is because of a random mutation. A mutation is a genetic alteration or a change in the DNA sequence which results in the generation of a variant. Mutations in the DNA sequence which occur without any specific pattern is known as a random mutation.

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brainly.com/question/13923224

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5 0
1 year ago
nergy used by the body to perform muscular contractions is called adenosine diphosphate, or ADP.TrueFalse
olga2289 [7]

The answer is false.

Energy used by the body to perform muscular contractions and many other energy-required functions is adenosine triphosphate or ATP.

The most important function of ATP is its ability to store and transport chemical energy within cells. That energy can be used for many chemical processes such as muscle contraction, nerve impulse propagation, chemical synthesis.. When consumed in metabolic processes as an energy source, it becomes converted either to adenosine diphosphate (ADP) or to adenosine monophosphate (AMP) because one or two phosphate groups are released (hydrolysis of high-energy bonds).

Since ATP is a nucleoside triphosphate it can be used for the synthesis of nucleic acids.

3 0
3 years ago
Which of the following statements is true?
maksim [4K]

Answer:

All organisms require sulfur as a macro-nutrient. (Ans. E)

Explanation:

Sulfur is necessary for all living things. It is taken up in the form of sulfate from the soil and sea water by the plants, and algae.

Sulfur is known as the essential nutrient for plant growth. Sulfur playing various important role in plants. About 90% of the sulfur is absorbed by the plants for the purpose of amino acids synthesis, known as the building blocks of proteins. Sulfur is important for the enzyme which is helping in the formation of the chlorophyll molecule. Sulfur is essential for the synthesis of oil crops.

In human body sulfur playing some essential role such as amino acid production which is converting into proteins and producing enzymes. Sulfur is important for insulin production, insulin allow the cells to use glucose as energy. Sulfur is found in most important antioxidant known as glutathione, which helping in the inhibition of oxidation of the other molecules and preventing from cell damage. Collagen provide skin strength and structure, sulfur is important for collagen synthesis as well.

5 0
3 years ago
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