Below are several phenomena relating to protein structure. Clearly describe each phenomenon, the conditions under which each occurs, and the probable influence each has on protein structure
(a) hydrophobic interactions
(b) hydrogen bonds
(c) disulfide bridges
What will be an ideal response?
(a) Hydrophobic interactions: These are nonpolar side chains of amino acids that tend to associate to form hydrophobic clusters usually away from the protein surface. (b) Hydrogen bonds: Such bonds may occur between the components of the peptide bond, the side chains, or a combination of the two. They are responsible for helical and pleated sheet structures of proteins. (c) Disulfide bridges: Such bonds are formed between two cysteine side chains and, because of their covalent nature, represent relatively strong attractive forces between different (sometimes distant) regions of proteins.
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a. antibiotics b. muscle relaxers c. tranquilizers d. blood pressure medications e. stimulants
In eukaryotes, the translation initiation complex forms in association with the 40S ribosomal subunit
Indicate whether the statement is true or false
Which mineral is especially important for women to incorporate into their diet if they are menstruating?
A. sodium B. aluminum C. magnesium D. iron
Which of the following statements is not accurate?
a. Not all hormones are secreted by endocrine glands. b. Hormones are transported through the circulatory system to their destinations. c. Target cells have specific hormone receptors. d. Hormones are essential to homeostasis. e. Because steroid hormones influence gene expression, they produce a faster response in target cells.