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2 years ago

Define the scientific method in your own words. give and example of method showing all the steps.

Biology

2 answers:

Lesechka [4]2 years ago

7 0

The scientific method is a way to ask and answer scientific questions by making observations and doing experiments.

Andrei [34K]2 years ago

5 0

The scientific method is the important process by which all scientific knowledge is acquired

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A) Compare and contrast diffusion, passive transport (diffusion & facilitated), primary active transport and secondary activ

zheka24 [161]

Answer:

Passive transport: It does not need any energy to occur. Happens in favor of an electrochemical gradient. Simple diffusion and facilitated diffusion are kinds of passive transport.

Simple diffusion: molecules freely moves through the membrane.

Facilitated diffusion: molecules are carried through the membrane by channel proteins or carrier proteins.

Active transport needs energy, which can be taken from the ATP molecule (Primary active transport) or from a membrane electrical potential (Secondary active transport).

Explanation:

Diffusion: This is a pathway for some small polar hydrophilic molecules that can freely move through the membrane. Membrane´s permeability depends on the size of the molecule, the bigger the molecule is, the less capacity to cross the membrane it has. Diffusion is a very slow process and to be efficient requires short distances and pronounced concentration gradients. An example of diffusion is osmosis where water is the transported molecule.

Facilitated diffusion: Refers to the transport of hydrophilic molecules that are not able to freely cross the membrane. Channel protein and many carrier proteins are in charge of this passive transport. If uncharged molecules need to be carried this process depends on concentration gradients and molecules are transported from a higher concentration side to a lower concentration side. If ions need to be transported this process depends on an electrochemical gradient. The glucose is an example of a hydrophilic protein that gets into the cell by facilitated diffusion.

Simple diffusion and facilitated diffusion are passive transport processes because the cell does not need any energy to make it happen.

Active transport occurs against the electrochemical gradient, so it does need energy to happen. Molecules go from a high concentration side to a lower concentration side. This process is always in charge of carrier proteins. In primary active transport the energy needed comes from the ATP molecule. An example of primary active transport is the Na-K bomb. In secondary active transport, the energy comes from the membrane electric potential. Examples of secondary active transport are the carriage of Na, K, Mg metallic ions.

7 0

2 years ago

How were Lamarck’s and Darwin’s ideas most similar?

irinina [24]

Answer:

Darwin and Lamarck's theory is different but they were also very similar. Both of them thought that the organism changed, and they are very helpful for the organism to survive. These characteristics are also passed to their young generation.

Darwin theory state that an organism gets the helpful variation before the changes in the environment, Lamarck's theory said that organism gets variation after the change in the environment.

Lamarck's stated that giraffe got long neck when the food on the ground ran out. In order to get the food they stretch out their neck to get food. Darwin thought organism changed by chance, at the time when they are born and before the change in the environment.

6 0

3 years ago

Read 2 more answers

Which of the following is an example of a human disruption to the balance of nature?

adoni [48]

The answer is D: poaching, since it harms wildlife and destroys ecosystems.

6 0

2 years ago

What is the relationship between evidence, conclusions and theories.will mark brainliest

Pie

Answer:

They are inter-related with each other.

Explanation:

There is a great relationship present between evidence, conclusions and theories because evidences are those materials due to which a hypothesis can be verified and we can draw conclusion. When we repeat the same experiment and find out the same conclusion so it becomes theory and when these theories can't change with the passage of time, it becomes law. So evidence, conclusions and theories are inter-related to each other.

5 0

3 years ago

Use of moist heat can control microbial growth in many circumstances, but heat-sensitive items and those susceptible to moisture

sattari [20]

<h2>Answer is option "b"</h2>

Explanation:

Non-ionizing radiation is radiation that has a lower frequency, or longer wavelength, in the EMR spectrum. These frequencies range from that of power lines, radios, and cell phones, up to visible light. Non-ionizing radiation is not powerful enough to break the chemical bonds in molecules. In general, it is not harmful to human health as radiation per se, but could be harmful in terms of the transfer of heat energy. An example of an emitter of non-ionizing radiation is a microwave oven.
Non-ionizing radiation is less harmful because the rays carry much less energy. Radio waves, light, and even heat are examples of non-ionizing radiation. For the most part, these kinds of radiation do not cause any damage. However, ultraviolet light is a kind of non-ionizing radiation that can be harmful - it can cause mutations in DNA
Non-ionizing radiation is limited to the lower energy range electromagnetic radiation, which is more commonly known as light. However, the light we can see with our eyes, visible light, is only a small section of the electromagnetic radiation spectrum as seen here
Hence the right answer is option "b"

7 0

2 years ago