Answer:
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I think your answer is
They dvelop from 2 separate eggs
Fraternal twins each come from their own egg and sperm. The term for this is dizygotic , while identical twins are monozygotic.
Explanation:
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Letter c is correct answer hope that helps you
Answer:
The thyroid stimulating immunoglobulin in Graves disease is an antibody to the membrane receptors of thyroid cells that bind TSH.
Explanation:
Graves disease is an auto-immune disease in which antibodies produced by one's own body attacks the thyroid gland.
When pituitary gland is stimulated by TRH i.e. thyrotropin releasing hormone from hypothalamus, it releases TSH i.e thyroid stimulating hormone. TSH then goes and binds to the receptors on thyroid cells and stimulate the release of T3 and T4 thyroid hormones. In case of graves disease the antibody binds at the same site as TSH thereby continuously giving signal for the release of T3 and T4 thyroid hormones. This results in hyperthyroidism.
Answer:
A) effect of sugar on a metabolic activity of yeast
Explanation:
In this experiment, everything was kept the same except for adding sugar into one test tube and none on the other. The data that was recorded was the bubble formation. Bubble formation is an indicator for a chemical reaction and in this case it is the metabolic activity of the yeast.
Everything that is kept constant like the amount of yeast suspension, temperature and time it was placed in the warm water bath are what we call controlled variables. This is done to prevent any other variables from affecting what is being tested.
The amount of sugar is what is different and this is called the independent variable. This is what we are testing to see if it will have an effect.
Finally, bubble formation or metabolic activity is the dependent variable. This is what will be observed as a result of the changes in the independent variable.