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Tutor profile: Chance J.

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Chance J.
Tutor for 1.5 years and graduate with Biomedical science degree
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Questions

Subject: Chemistry

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Question:

What will happen to a cup filled to the brim with ice and water once the ice melts? The water level will slightly decrease. This occurs because of the density of water as a solid and as a liquid. When the ice melts it gains density. Since the actual mass of that unit of water (frozen and unfrozen) doesn't change, the only way for the density to increase is for the volume to decrease. This means that as ice melts, the volume actually decreases slightly.

Inactive
Chance J.
Answer:

Organic chemistry is dependent upon which elements? Carbon and hydrogen. While most think carbon is the only essential element that makes things organic or not, this is not true. Some compounds, like CO2 contain carbon but are actually inorganic. All compounds with carbon and hydrogen are organic. There is one exception to this which is carbon tetrachloride, an organic solvent. It isn't actually organic but it does dissolve organic molecules since it is nonpolar.

Subject: Biology

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Question:

Very broad topic. If a male and female have a child what are the odds the child has hemophilia (this is an x-linked sex-linked disease). The mother is a carrier (xX) and the father doesn't have the disease (XY). Here, capitalized letters represent the dominant and healthy alleles while the lowercase letters represent the recessive, disease causing allele. If the male and female have 4 children, 2 males and 2 females, what are the odds of having a male with the disease? Odds of having a female with the disease? Using a punnet square, we can see that this disease would have a 50% chance of occurring in a male since the males would have a 50/50 chance at getting the dominant or the recessive allele. Since males only have one X chromosome, the disease will occur with only one recessive allele. Since females have 2 x chromosomes, the disease will need a pair of recessive alleles to cause hemophilia and, in this example, that isn't possible. So, there is a 0% chance that any of the parents' daughters will have hemophilia while there is a 50% chance that the sons will get the disease.

Inactive
Chance J.
Answer:

What is the sliding filament theory? The sliding filament theory explains how our skeletal muscles can contract when we signal them to. Then action potential travels down a motor neuron and stimulates the release of acetylcholine at a motor end plate (the point of "attachment" of the neuron and muscle). The acetylcholine signals a depolarization in the muscle that is carried throughout via T tubules. These signals stimulate the release of Calcium from the sarcoplasmic reticulum in each muscle fiber. With calcium in the sarcoplasm, the calcium can now act on the troponin-tropomyosin complex and move troponin from the myosin binding sites. Now that these sights are open, the myosin heads bind to the actin filaments. Once ATP binds to the myosin heads (specifically the ATPase) the myosin heads lose affinity for the binding sites on Actin and disassociate from them. They are now in a "cocked" position. Then, the ATP us hydrolyzed and is now ADP and inorganic phosphate. The myosin head now binds to actin again. Once the inorganic phosphate leaves the myosin head, a power stroke is initiated. The power stroke is what pushed the actin filament. The head releases ADP and the process can start all over again.

Subject: Algebra

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Question:

5(z+1) = 3(2z+2)+11 5z+5 = 6z+6+11 5z+5 = 6z+17 5=z+17 -12=z Answer

Inactive
Chance J.
Answer:

Simplify the following: (x^2+8x+15) / (4x+12) The top of the fraction can be rewritten as (x+3)*(x+5) and 4x+12 can be rewritten as 4(x+3) So, (x+3)*(x+5) / 4(x+3) Now we can cross our the two (x+3) and you get (x+5)/4 which is the simplified answer

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