Answer:
true
Explanation:
blood from heart to body, blood from body to other arteries back to heart and then pumps back into your body again, repeating the process over and over again
Answer: Much like the processes of DNA replication and transcription, translation consists of three main stages: initiation, elongation, and termination. Initiation takes place with the binding of a ribosome to an mRNA transcript.
Answer:
Correct Answer: Ribosomes
Explanation:
Electron micrograph of <em>ribosomes</em> attached to the rough ER in a pancreatic exocrine cell. Most of the proteins synthesized by this cell are to be secreted and are formed on <em>membrane-attached ribosomes</em>.
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Answer:
models provides testing of hypothesis.
Humoral model proves that the cause for cholera is contaminated food and water.
Miasma model of disease suggested that bad air is the cause for cholera disease.
experiment provides testing of hypothesis.
Explanation:
Models helps to test the hypothesis and provides the procedure for the physical testing of it. Humoral model of disease proposed that contaminated of food and water is the main cause for cholera. Miasma model of disease proposed that bad air is the cause for cholera disease. Experiments are considered strong tests of hypotheses because experiment is performed physically while hypothesis is the assumption made by the scientists.
For radioactive materials with short half-lives, you use a very sensitive calibrated detector to measure how many counts per second it is producing. Then using the exact same set up you do the same at a latter time. You use the two readings and the time between them to determine the half-life. You don’t have to wait exactly a half-life, you can do the math with any significant time difference. Also, you don’t need to know the absolute radioactivity, as long as the set up is the same you only need to know fraction by which it changed.
For radioactive materials with long half-lives that won’t work. Instead you approach the problem differently. You precisely measure the mass of a very pure sample of the radioactive material. You can use that to calculate the number of atoms in the sample. Then you put the sample in a counter that is calibrated to determine the absolute number of disintegrations happening in a given time. Now you know how many of them are disintegrating every second. You use the following equations:
Decays per Second = (Number of Atoms) x (Decay Constant)
Half-life = (Natural Log of 2) / (Decay Constant)
And you can calculate the half-life
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