Since structure correlates well with function, look for new ways to probe the complex structure of proteins in order to understand what they do and how they do it. One of the most powerful techniques in existence today is X-ray crystallography. The main difficulty with this technique is getting the protein to crystallize. Here we see a crystallized integral protein embedded in the plasma membrane. Knowing what you do about how to read amino acids L>R, if you were reading off the sequence of amino acids in the figure shown, what should the first three letters be? A. M-N-G B. A-P-A C. It does not matter, since the protein has no polarity or directionality.

\[ y=2 x^{2}+4 x-6 \] Seleccione una: a. \( (1,0) \) y \( (3,0) \) b. \( (-1,0) y(-3,0) \) c. \( (-1,0) y(3,0) \) d. \( (1,0) y(-3,0) \)

The equation of line \( d \) is \( y=\frac{97}{70} x-51 \). Line e is perpendicular to \( d \). What is the slope of line \( e \) ? Simplify your answer and write it as a proper fraction, improper fraction, or integer.

1) Da palavra IMAGENS: Quantos são os anagramas que começam com vogal?

13 The points \( (-3,5) \) and \( (2,20) \) lie on the curve given by the equation \( y=3 x^{2}+b x+c \). Use an algebraic method to find the values of \( b \) and \( c \).

Given that \( 13 \sin \alpha-5=0 \) and \( \tan \beta=-\frac{3}{4} \) where \( \alpha \in\left[90^{\circ} ; 270^{\circ}\right] \) and \( \beta \in\left[90^{\circ} ; 270^{\circ}\right] \) Determine, without using a calculator, the value of the following: \( 5.2 .1 \quad \cos \alpha \) \( 5.2 .2 \quad \cos \left(450^{\circ}-\beta\right) \) \( 5.2 .3 \quad \cos (\alpha+\beta) \)