Homework_5_01-16-09_C&A

Homework_5_01-16-09_C&A - Biology 5A Homework 5...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Biology 5A Homework 5 January 16-21, 2009 1. The accompanying figure shows a portion of the backbone of a polypeptide that has a beta pleated sheet secondary structure. The letters W, X, Y, and Z represent atoms involved in hydrogen bonding. Identify these atoms. A. W = C, X = S, Y = H, Z = N B. W = C, X = O, Y = H, Z = N C. W = N, X = H, Y = O, Z = C D. W = C, X = O, Y = H, Z = S E. W = P, X = O, Y = H, Z = S (Ans. B) 2. At 37 degrees C, a certain human protein exists in its native, or normal, conformation as shown at left in the accompanying figure. When the protein is heated to 80 degrees C for 15 minutes and then cooled back to 37 degrees C, it has the conformation as shown at right. The most likely explanation of what happened here is that: A. Primary structure was lost because the heat broke the covalent bonds holding the amino acids together.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
B. Secondary structure was lost because the heat broke the hydrogen bonds between peptide bonds in the chain.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 3

Homework_5_01-16-09_C&A - Biology 5A Homework 5...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online