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# Tutor profile: Melissa A.

Melissa A.
Science tutor and Music teacher

## Questions

### Subject:Music Theory

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Question:

What is the circle of fifths?

Melissa A.

The circle of 5ths is a circular arrangement of all the 12 notes in the musical alphabet. Each note is a fifth apart. So a C becomes G, and G becomes D, and so on. The arrangement looks very similar to a clock so the position of the musical letter would correspond to a number on the clock. However, after position 6 o'clock, the numbers go backwards so it would be 0, 1,2,3,4,5,6,5,4,3,2,1. Those numbers represent the number of sharps or flats in that specific key. The right half of the clock is for the number of sharps and the left half of the clock is for the number of flats. For example, on the circle of 5ths G is where one o'clock would be on a clock. So it would have one sharp.

### Subject:Clinical Lab Sciences

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Question:

Why are there different caps of blood collection tubes mean?

Melissa A.

When blood is collected for examination, you'll notice the tube it's being collected in has different colors. The colors of the tube represent a different anticoagulant. An anticoagulant needs to be used because after a while the blood will clot together and when it reaches that point, examinations cannot be performed and a new tube must be collected. In clinical chemistry, the most common colored tube caps seen are green, gray, red, and gold. In hematology, the most common colored tube is purple.

### Subject:Biomedical Science

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Question:

What is the difference between the lytic and lysogenic cycle?

Melissa A.

The lytic and lysogenic cycle refers to the way bacteriophage can infect and a bacteriophage is a virus that infects bacteria. The lytic cycle the bacteriophage basically attaches to the bacteria and injects its viral genome into it. The machinery used for transcription and translation in the bacteria is used to transcribe and create the components of the bacteriophage using the viral genome as a template. Once all the components of the bacteriohage is made, the bacterial cell will lyse and the bacteriophage created can go on and insert that viral genome into other bacterial cells. In the lysogenic cycle, the beginning process is similar but instead of making the bacteriophage immediately, the viral genome will get integrated into the genome of bacteria and hide, causing no harm to the bacteria. As the bacteria undergo replication, the viral genome also gets replicated since it is part of the bacteria's genome. Under certain conditions, the viral genome is extracted and will transition into the lytic cycle. The main difference between the two cycles is that the genome is not integrated in the host's genome while in the lysogenic cycle, it is integrated.

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