Biology 5A Homework 9 January 30-February 2, 2009
Which of the following types of cytoskeletal fibers is NOT correctly matched with a type of motor protein? A. microtubules - kinesin B. intermediate filaments - keratin C. microtubules - dynein D
Biology 5A Homework 8 January 26-28, 2009
Red blood cells circulating in the bloodstream need to take up amino acids to maintain their structure and function. This homework problem involves an experiment investigating the glutamine (Gln, an amin
Biology 5A Homework 7 January 23-26, 2009
We know from lecture that hydrophobic interaction is the clustering of nonpolar molecules or groups together in water to minimize disruption of H-bonding between water molecules. This homework problem wi
Biology 5A Homework 6 January 21-23, 2009 1. The accompanying figure shows a trinucleotide. Which of the following statements about this trinucleotide is true?
A. B. C. D. E. (Ans. D) 2.
The trinucleotide is a DNA, and the left end is the 3' end. T
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
Biology 5A Homework 4 January 14-16, 2009
Much of the strength of the hard white enamel of teeth is due to hydroxyapatite, an aggregated form of calcium phosphate. This calcium phosphate is held together by ionic bonds between the calcium cation
Biology 5A Homework 2 January 9-12, 2009 1. Which of the following does NOT represent a polar covalent bond? A. H-O B. C=O C. C-H D. H-N E. N=C (Ans. C) 2. In which of the following could * represent a hydrogen bond? A. B. C. C H * O C N H * H O
Biology 5A Homework 3 January 12-14, 2009 1. The pH in the cell wall of a certain plant is 4.5. This means that the hydrogen ion concentration in the cell wall is: A. 4.5 X 10-14 M B. 10-5 M < [H+] < 10-4 M C. - log(4.5) M D. [H+] < [OH-] E. antilog(
Biology 5A Homework 1 January 7-9, 2009 1. We used Roger & Anita, Pongo & Perdita from 101 Dalmatians as an analogy to better understand the covalent bond in the hydrogen molecule, H-H. Apply the same analogy to understand the covalent bond between N