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Zoey P.
Biochemistry and Molecular Biology major, with a Minor in Mathematics
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Chemistry
TutorMe
Question:

Calculate the pH of an aqueous solution at 25 degrees C that is 3.7X10^-3 M in HI.

Zoey P.
Answer:

Standard conditions pH=-log(HI M) pH= -log(3.7X10^-3) pH= 2.4

Biology
TutorMe
Question:

What are the two many stages of photosythesis and exaplin how each satge works?

Zoey P.
Answer:

1. Capture Energy -light dependent reactions -Take place in the thylakoid membrane 1. Starts by producing O2 in thylakoid lumen via oxidation of H2O by PSII 2. ATP produced in stroma by H+ electrochemical gradient -Splitting of water places H+ in the lumen -High-energy electrons move from PSII to PSI, pumping more H+ into the lumen -Formation of NADPH consumes H+ in the stroma 3. NADPH produced in the stroma from high-energy electrons that started in PSII and boosted to higher energy levels in PSI 2.Make carbohydrates -This is the Calvin cycle and there are three parts 1. Carbon fixation -plant grabs CO2 from atmosphere nad incorporates it into RuBP using rubisco enzyme -the 6 carbon intermediates are split into 2-3 carbon 3PG molecules 2.Reduction and carbohydrate production -this is the part where sugar is made to sustain the plant's life -ATP is used to convert 3PG into 1,3-bisphosphoglycerate, a form with 2 phosphates -NADPH electrons used to reduce it to G3P -Overall 6 CO2 → 12 G3P (2 G3P used to make carbohydrates10 G3P continues in the Calvin Cycle) 3. Regeneration of RuBP -10 G3P converted into 6 RuBP using 6 ATP

Statistics
TutorMe
Question:

46% of all sandwhiches hav turkey on them. Supposed 20 sandwhiches are selected. What it the probabilty that 6 of them have turkey?

Zoey P.
Answer:

n=20, p=.46, k=6 P(X=6)=(n!/(k!(n-k)!))p^k(1-p)^(n-k) =(20!/(6!(20-6)!)).46^6k(1-.46)^(20-6) =38760(.46)^6(.54)^14 =0.66

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