The answer would be A I’m sure
<span>The correct answer should be B. a focus on their appearance. A is incorrect because teens rarely feel good about the way they look, they are always insecure about their body. C is incorrect because teens prefer to look good on the outside than on the inside. And D is incorrect because unfortunately they don't take a lot of care about their health and fitness. </span>
Answer:
C) Three hydrogen bonds will form with guanine.
Explanation:
Generally the DNA molecule is made up of Purines bases of Adenine and Guanine,and Pyrimidine of Cytosine and Guanine.However,RNA contains a different pyrimidine of Uracil.Thus the pairing is A-U am C-G.The uracil replaces Thymine.
The structure above is a Pyrimidine,because it is made up of single ring structure(an heterocylclic aromatic structure) compare to double structure of purines. Heterocyclic means it is ring form.Aromatic means it has resonance bonds which shift with the rings for stability.
It is also contains of two substitutes at position 4 of the ring structure (amineNH2) and at 2 which is the Keto group(=0).Therefore the structure is Cytosine.
In RNA structure the Cytosine pair with the three hydrogen bonds with guanine,while Adenine pair with Uracil.This ensures stability of the RNA structure.
Answer:
The correct answer is option a. "vocal folds (true vocal cords)".
Explanation:
The vocal folds are composed of twin bands of elastic ligaments of mucous membrane stretched horizontally. The vocal folds are key in creating sounds and are the structures that allow us to speak. The size of the vocal folds determines the pitch of the voice, and its movement is controlled by the vagus nerve, which allows it to be open when breathing and vibrating when singing.