test 1 practice

Question 17.

QUESTION 19 Briefly explain why there are + and - charges in the amino acid structures in the table of common amino acids. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). B IUS Paragraph Arial 10pt A v 面 田旺 田 QUESTION 20 Click Save and Submit to save and submit, Click Save All Answers to save all answers. MacBook Pro G Search or type URIL esc &

Almost all proteins are composed from a set of about _____ amino acids.a. 4b. 10c. 20d. 50  ______ amino acids are considered essential.a. 5b. 10c. 15d. 20  An amino acid that has an indole group side chain.a. Trpb. Phec. Tyrd. ProWhich of the following is the simplest amino acid?a. Alab. Glyc. Vald. ProWhich of these will not give a blue solution with Ninhydrin testa. Prob. Phec. Alad. CysA neutral molecule with a positive and negative electrical charge.a. Isoelectric pointb. Zwitterionsc. Bufferd. Amphoteric3 amino acids joined together by two peptide bonds.a. Dipeptideb. Tripeptidec. Tetrapeptided. PolypeptideAn amino acid that can form disulfide bondsa. Cysteineb. Methioninec. Cystined. SerineWhich of the following is not a property of amino acidsa. Bufferb. Isoelectric pointc. Zwitterionsd. Insoluble in waterThe protein primary structure is held together bya. Hydrogen bondsb. Disulfide bondsc. Peptide bondsd. Protein bonds

12. In some proteins, hydrogen bonding occurs between polar residues and the surrounding aqueous environment, forcing the polar residues to the exterior of the protein. What are the interactions between the polar residues and the aqueous environment called? a. hydrophilic interactions b. salt bridges c. nonpolar interactions d. hydrophobic interactions e. dispersion forces

Question#1 : Select the correct answer: a. Caffeine is (neutral, acidic, basic) substance b. Tannic acid is (neutral, acidic, basic) substance c. Cellulose is (neutral, acidic, basic) substance   Please explain your answer.

Answer all 8 questions please please please.

MgCl2 is a/an _____ subtance   a. organic b. ionic c. strong acid d. string base

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I don't get it at all. I struggled with this question. Can you help me? Can you explain to me?

I. Enzymes are globular proteins II. Enzymes react with specific substrate. III. Enzymes are biodegradable substances. O All statements are correct O All statements are wrong O Statements I & II are correct. O Statements I & III are correct O Statemnets II & III are correct Dietary proteins yield amino acids and are deposited in the nitrogen pool. O True O False

Question 6: The structural diagram of one of the twenty amino acids is given below. Look at and answer the next two questions. H >--< N-C-C H H O-H 6a. Which chemical groups are present in this amino acid? Name them. H 6b. Is this amino acid hydrophobic, hydrophilic, or amphipathic? How do you know? Explain. Use the terms electronegativity and polar in your answer. (You might want to

Which of the following functional groups is NOT found in amino acids? A. amine B. amide C. carboxyl D. aldehyde

Examine the structure of the following amino acid and answer the questions below: Name the amino acid. Does it exhibit optical activity? Why? Describe the acid-base properties of amino acids. What is zwitterion?

Theoretical Questions 1. Draw the general structure of the zwitterion form of an amino acid using the letter R for the side chain group. What is the term given for the pH range at which an amino acid exists in the zwitterion form? 2. What functional group results when amino acids are linked together? 3. Give the four different classifications for amino acids. Which ones have side chains that could have a charge? 4. Define Denaturation. Changes in which levels of protein structure could cause denaturation could occur?

NAME This is an IONIZED amino acid monomer Put a box around the and label the amino group. Does this group function as an ACID or BASE? Put a box around the and label the carboxyl group? Does this group function as an ACID or BASE? Circle the R group. What is this functional group? Use an arrow to show the alpha carbon. What specific amino acid is this? What is the classification of this amino acid? hydrophobic, hydrophilic, Why is it classified that way? U# H CH3 I-Z-I +H-N-C-C. -I H H ΤΑ Redraw this amino acid in the non-ionized form Module Problem 1:38 O O SEAT # charged,

1. The function of proteins in the body is/are a. energy b. signaling c. structure d. a thru c are all correct 2. The three-dimensional structure of one entire protein is known as a. an amino acid junction b. a zwitterion c. tertiary structure d. a disulfide bond 3. The monomeric unit of a polypeptide is a/an a. amino acid b. fatty acid c. carboxylic acid d. fatty base 4. A proteins shape is determined by its a. intramolecular forces b. attraction to water c. amount of sulfur d. amount of potassium 5. Disaccharides contain a. two amino acids b. two fatty acids c. two monosaccharides d. none of the above are correct I

What functional groups are contained in the molecule below?  methyl amino phosphate carbonyl carboxyl hydroxyl

An anhydride is an organic molecule derived from two carboxylic acids. What are these two acids for the molecule in the picture? i. Two butanoic acidii. One octanoic acidiii. Butanoic acid + propanoic acidiv. Acetic acid + butanoic acid

True or false   Acidic drugs tend to ionize in basic medium.    Basic drugs tend to be absorbed in basic environment, like the duodenum.   Acidic drugs are excreted faster if the urine is acidic.   Basic drugs remain unionize in a basic environment.   Polarity of the drug increases as the number of carbon increases in a compound.

A(n) ___________ is composed of a sugar molecule, aphosphorus-containing group, and a nitrogen-containingmolecule called a base.

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Amino acids are synthesized by plants to store nitrogen. True or false.

4. Calculate the pH of a 0.100 M solution of alanine prepared from the form shown below. pKa (-COOH) = 2.344 and pKa (-NH;") = 9.868. H *H;N- C C O- CH3 pH = 6.106 5. Referring to Question 4, calculate the concentration of the fully protonated form of alanine in the solution described in Question 4. [H2A*] = 1.72*10-$ M