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Marissa H.
Masters Student in Biology
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Biology
TutorMe
Question:

Describe photo system 1 of the light reactions that occur during photosynthesis.

Marissa H.
Answer:

First, photosystem 1 occurs after the photosystem 2 reaction. This photosystem absorbs photons at the 700 nm wavelength which in turn excites an electron to be reduced into NADP+. Another way PSI can receive an electron is through the cytochrome complex which is the transfer protein from PSII to PSI. Once the electron is received it then is further reduced to make NADP+ too.

Anatomy
TutorMe
Question:

Describe the types of cells found in bone tissue and their roles.

Marissa H.
Answer:

Within bone tissue there are the following cells: osteocyte, osteoblast, osteoclast, and osteogenic cells (stem cells). The osteocyte maintains bone tissue while the osteoblast creates/produces more bone tissue by releasing collagen and other minerals. However, the osteoclast destroys bone tissue for bone tissue remodeling and the osteogenic stem cells develop into various bone tissue cells based on the stimulus provided by the tissue.

Materials Science
TutorMe
Question:

What are the top three materials properties that a scientist must consider when designing a material for a hip replacement? Why are these your top three properties to consider?

Marissa H.
Answer:

When considering a hip replacement, this material will endure high compression stresses and strains while also providing smooth movement for the individual. My top three properties would be fatigue limit since this material will undergo constant repeated forces, surface roughness since that would affect the movement of the material, and corrosion since most materials implanted will corrode within the body.

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