# Tutor profile: Adaure A.

## Questions

### Subject: Biology

Why is DNA twisted? (It will help in your explanation if terms are defined, you mention the importance of DNA, and benefits of its current arrangement/complications of it being in another arrangement.)

The shape of DNA is known as a double helix and is sometimes described to look like a spiral staircase or twisted ladder. DNA is one of the two familiar nucleic acids (RNA is the other). Nucleic acids are information-carrying molecules of the cell that when utilized by protein synthesis, helps determine the inherited characteristics of living things. DNA is comprised of three main components: nitrogenous bases, deoxyribose sugars, and phosphate molecules. The interactions between water and the molecules that compose DNA cause this nucleic acid to take on a twisted/helical shape. This shape aids in the packing of DNA into chromatin fibers, which condense to form chromosomes. The helical shape of DNA also makes DNA replication and protein synthesis possible. When necessary, the double helix unwinds and opens to allow DNA to be copied.

### Subject: English

Which of these is true concerning this statement? Select all the correct answers. [Testing of Reading Comprehension, Critical Thinking, and Inference] ***A stapler weighs more than a paper clip but weighs less than a desk.*** A) The stapler weighs less than the paper clip. B) The stapler weighs the most. C) The desk weighs the most. D) The paper clip weighs the least. E) I don't know, please teach me.

The correct answers are C & D. E is also accepted. Because we are using comparative language, we will rank the weights of each object according to the statement given. We will use letters, S, P, and D to represent the stapler, paper clip, and desk, respectively. (Answer choice E) The first part of the statement state that "the stapler weighs more than the paper clip", therefore [S > P]. The second part of the statement states that "but weighs less than a desk" (we are still comparing the stapler to the other object here not the paper in comparison to the desk) therefore, [S < D]. These statements tell us that the stapler is in the middle of the weights. The paper clip is less than both the desk and stapler so it weighs the least. (Answer choice D) We can infer that the desk would be ranked at the top because it doesn't weigh less than either the paper clip or stapler. We then combine the statements so that they are representative of the order of weights of the objects. [ S > P and P < D ---> P < S < D] (Answer choice C) Critical Thinking: From the second statement, if we were comparing the paper clip and the desk, we would not be able to directly tell if the desk is the same weight as the stapler just because it weighs more than the paper clip. So we can also infer from that that the most true statement would be, [ P < S <= D] where the desk weight can be greater than or equal to the stapler but both are greater in weight than the paper clip.

### Subject: Algebra

3x+4=7x-4

Step 1: Isolate variables to one side of the equation by either adding or subtracting. [3x+4=7x-4] -It's best to always have a possible variable, so that means whichever side has the "bigger variable", we move the other variable to that side. 7 i.e. "7x" is bigger than 3 i.e. "3x" so we will move the 3 to the right-hand side. How will we move it? By performing the opposite function, so that the 3 on the left-hand side will cancel out to equal zero. The "3x"has no sign in front of it so it is understood to be a positive number. That means that we will do the opposite of the positive number and subtract the 3x from both sides so that it is equal. Step 2: Substract 3x from both the left and right side. [3x - (3x) + 4 = 7x - 3x - 4] -3x is subtracted from the left side so that the positive and negative three cancel each other out and then on the right side so that the variables are isolated to one side of the equation. Step 3: Isolate the constants to the other side of the equation. [4 (+4) = 7x - 3x - 4 (+4) ] -Since we have already decided that the constants belong on the right hand side of the equation, we will move the constants (numbers) to the left hand side of the equation via the same method we did for the variables. Since we have a "negative" four/a four being subtracted on the right side hand side, to cancel it out on the right hand side we will have to perform the opposite function which is addition. We will proceed to add four to both sides of the equation Step 4: Simplify. [8 = 4x ] - I this step we simplify both sides of the equations by adding or subtracting the like terms. Step 5: Solve for x. [2 = x ---> x = 2] -Now that we have simple terms and numbers to use we then solve for x by dividing the number in front of the variable, into the constant. We then ask ourselves, how many times does 4 go into 8? If we use a drawing, we will see that there are 2 groups of four in 8 so 2 equals x. Write it formally so that the variable appears first while reading the expression and know that x = 2.

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