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# Tutor profile: Luis H.

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Luis H.
Undergraduate at California State University, Fullerton
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## Questions

### Subject:Music

TutorMe
Question:

What is the structure of a major scale?

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Luis H.

The structure of a major scale can be represented by: whole,whole, half, whole, whole, whole, half. whole=2 half notes away. half= 1 half note away. To understand what this means we need to look at a chromatic scale. This scale shows the procession of half notes from the previous note. So basically, it is all halves. A C chromatic scale will go start with a C and end at the next C (an octave). The scale is: C, C#, D, D#, E, F, F#, G, G#, A, A#, B, C. So if we use the structure: whole,whole, half, whole, whole, whole, half; we can outline a C Major scale. Note that half is= to one note change on a chromatic scale. Ex. C--> C# is a half. and C-->C#-->D is 2 half notes. Which means C--> D is a whole. A C Major is: C,D,E,F,G,A,B,C

### Subject:Biology

TutorMe
Question:

What evidence is there for the endosymbiotic theory?

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Luis H.

The evidence is in the DNA of organelles like mitochondria and chloroplast. The organelles have their own circular DNA and contain small ribosomes like ones found in prokaryotes. Also, the organelles replicate through binary fission which is how prokaryotes divide. In order to answer this, you need to understand what the endosymbiotic theory is. It is theorized that two prokaryotes developed a symbiotic relationship and formed a eukaryotic cell. The prokaryotes that were engulfed by protoeukaryotes became the organelles of that cell. With that knowledge, we need to prove that the organelles are prokaryotic. In order to do this, we need to understand the features of a prokaryote. Prokaryotes are characterized by their circular DNA, small ribosomes, a lack of organelles, and a nucleoid( no membrane-bound nucleus). They also divide through a process called binary fission. If we can determine that organelles like mitochondria are prokaryotic, then we can support the endosymbiotic theory. It is known that mitochondria contain circular DNA and small ribosomes. The fact that it has circular DNA is the mist prominent piece of evidence. Also, the fact that it divides through binary fission is also a notable piece of evidence.

### Subject:Algebra

TutorMe
Question:

At what points are the X-intercepts for the function: f(x)= x^2-3x-18 located at?

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Luis H.

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