thinker

1. Why are the most unsaturated fatty acids found in phospholipids in the cis rather than the trans confirmation? Draw the structure of a 16-carbon fatty acid as saturated, trans monosaturated, and cis

1. The melting points of a series of 18-carbon fatty acids are stearic acid, 69.60C, oleic acid, 13.40C; linoleic acid -50C; and linolenic acid, -110 What structural aspect of these 18-carbon fatty acids can be correlated with the melting point? Provide a molecular explanation for the trend in melting points.

In eucaryotic cells, disulfide bonds do not form in the cytosol. However, keratin intermediate filaments in the skin or in the hair are cross-linked by disulfide bonds. How can the disulfide bonds form in the keratin filaments? (In the perming of hair, the disulfide bonds in hair keratins are disrupted by reducing compounds. Then, the hair is styled in a desired shape and heat dried. In this process, new disulfide bonds are formed by oxidation that maintains the hairstyle.)

1. The shape of hair is determined in part by the pattern of disulfide bonds in keratin, its major protein. How can curls be induced?

1. Using known endo- and exopeotidase, suggest a pathway for the complete degradation of the following peptide:

His-Ser-Lys-Ala-Trp-Ile-Asp-Cys-Pro-Arg-His-His-Ala

Evaluate the line integral along the curve C.

8. Evaluate the line integral R
C
(xy + y + z)ds along the curve r(t) = 2ti + tj + (2 − 2t)k, 0 ≤ t ≤ 1

• Why does a wound on tongue heal faster than those on the other parts of the body?

Which of the following network modes allows a guest VM to communicate with the host and other similarly configured VMs but not the network?

A chemist carefully measures the amount of heat needed to raise the temperature of a 1.21 kg sample of a pure substance from 34.3°C to 47.6°C. The experiment shows that 75.6 kJ of heat are needed. What can the chemist report for the specific heat capacity of the substance? Round your answer to 3 significant digits.

A sonnet is known for its use of iambic pentameter and a shift in attitude towards the end of the poem.

 True False

4) Welfare Analysis: Trade (7 points)

Finally, let's suppose that this is a tiny country that opens up to trade, and the world price of coffee is $14 per lb. Assume that this country is a small enough part of the world market that its decision to trade does not impact the world price.

a. What is the domestic equilibrium price and quantity of coffee under autarky?

P* = $

Q*=

Ibs

b.

Draw the world price on the graph and clearly label the domestic quantities supplied and demanded with trade.

Quantity supplied:

_ Ibs

Quantity demanded:

bs

c. Will this country be a net-exporter or net-importer of coffee, and how many lbs of coffee will be imported or exported?