Enzymes called amino acyl-tRNA synthetases:     A. attaches amino acids to tRNA     B. synthesizes tRNA     C. destroys tRNA molecules     D. synthesizes amino acids

Question 1. If acidic foods (like tomato) are added to milk, a. serum coagulates b. fat content increases C. casein coagulates d. The fat coagulates Question 2. The quaternary structure of the protein is due to: a. Aggregation of two or more polypeptide molecules b. Disulfide bonds in the peptide c. Hydrogen bridges within the peptide d. All are correct

13. Which of the following types of interactions result in proteins folding so that nonpolar residues are on the interior of the protein, protected from water? a. hydrogen bonds b. salt bridges c. disulfide bonds d. hydrophilic interactions e. dispersion forces

Protein denaturation can alter the 3 dimensional shape of a protein alter the sequence of amino acids in protein Obreak the peptide bonds holding the protein together Other: What is the purpose of using enzyme in detergent industry? all of the statements are true Enzymes are used to remove protein stains O Enzymes are used to remove human sweat which have a tendency to adhere strongly on textile fibers O Enzymes are used to improve texture of cloth or fiber Other: When an enzyme becomes saturated with its substrate, the rate of reaction vs concentration of enzyme graph line becomes a plateau. To produce a significant change in the reaction rate O the pH must be decreased O the temperature must be increased O the concentration of the enzyme must be increased O the pH must be increased

4.     The amino acid Asp189 lies at the base of the substrate specificity pocket in the enzyme trypsin. a.   How is this related to typsin’s substrate specificity? Briefly describe the interactions between the substrate and the Asp 189. b.   If the Asp189 was replaced with a lysine residue, how would this affect substrate specificity? c.   The scientists that actually mutated the Asp189 to a lysine analyzed the three-dimensional structure of the enzyme and found that the lysine is actually not located in the specificity pocket. Instead, the Lys side chain reaches out of the base of the pocket, rendering the pocket nonpolar. With this additional information, determine how the substrate specificity would differ in the lysine-mutated enzyme.

A gene is a section of DNA that contains the instructions for making a. more DNA b. carbohydrates c. proteins d. lipids

Looking at the protein structure below, what would be an accurate way to describe the circled portion? Prosthetic group binding motif a. Domain c. Tertiary structure d. Quaternary Structure Subunit Of. Primary Structure

Give the definitions of the following : 1. chemical that brings about a change in biologic function through its chemical actions 2. promotes activity of a specific regulatory system or body process. 3. a substance that acts as an inhibitor 4. chemically synthesized outside the body 5. any drug or hormone in extremely high amounts can have harmful effects 6. poisons that are biologically synthesized 7. prescribed by a doctor or other authorized health professional and it has to be dispensed from a pharmacy or from another specifically licensed place 8. can be bought only from pharmacies and under a pharmacist's supervision 9. general sale medicines and pharmacy medicines 10.receives the agonist or antagonist molecule, and sends the signal to the body system it regulates

Draw the Lewis structure of the peptide "YQRWGLA"

The genetic information contained in a DNA molecule is ultimately expressed in a. an mRNA molecule b. an rRNA molecule c. the structure of a protein d. the transcription of the DNA