Can someone please help me on chemistry questions?

Posted on 2015-09-30 07:07:00 in Chemistry by ALICA

Can someone please help me? I just don't really understand #2. Also I have already done it but I want to know the correct answers.?

1.A dehydration rx joins amino acid monomers by forming a new ______.
a. covalent bond b. disulfide bond c. hydrogen bond d. ionic bond

2. Which “R” side group would give an amino acid an acidic property overall?
a. –H b. –CH3 c. –CH2OH d. –CH2NH2 e. –CH2COOH

3. The conformation of a ____ structure protein may be reinforced further by covalent bonds
called disulfide bridges. a. 1o b. 2o c. 3o d. none of these

4. An element that occurs in some lipids, but not in simple amino acids or sugars is
a. carbon b. nitrogen c. hydrogen d. phosphorus e. oxygen

5. Sickle cell disease is due to ___ in hemoglobin protein. a. weakened H bonds
b. one amino acid substitution c. broken disulfide bonds

True (“a”) or False (“b”)
6. A common characteristic of amino acid variable “-R groups” is they are all hydrophobic.

7. Proteins with more than one polypeptide subunits make up a quaternary structure.

8. Keratin is the fibrous protein of hair whose structure depends on many disulfide bonds.

9. Amino acids whose R-groups are made of C and H only are likely to be polar.

10. The amino end of an amino acid molecule can release a H proton and act as an acid.

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