AP Biology Self Assessment
C
If a DNA sample were composed of 10% thymine, what would be the percentage of guanine? A. 10 B. 20 C. 40 D. 80 E. it's impossible to tell from the information given
A
The bonding of two amino acid molecules to form a larger molecule requires A. the release of a water molecule. B. the release of a carbon dioxide molecule. C. the addition of a nitrogen atom. D. the addition of a water molecule. E. the release of a nitrous oxide molecule
D
The element nitrogen is present in all of the following except A. proteins B. nucleic acids C. DNA D. monosaccharides E. amino acids
B
The molecular formula for glucose is C6H12O6. What would be the molecular formula for a molecule made by linking three glucose molecules together by dehydration reactions? A. C18H36O18 B. C18H32O16 C. C6H10O5 D. C18H10O15 E. C3H6O3
C
The tertiary structure of a protein is the A. bonding together of several polypeptide chains by weak bonds. B. order in which amino acids are joined in a polypeptide chain. C. unique three-dimensional shape of the fully folded polypeptide. D. organization of a polypeptide chain into an α helix or β pleated sheet. E. overall protein structure resulting from the aggregation of two or more polypeptide subunits.
C
Upon chemical analysis, a particular polypeptide was found to contain 100 amino acids. How many peptide bonds are present in this protein? A. 101 B. 100 C. 99 D. 98 E. 97
A
What maintains the secondary structure of a protein? A. hydrogen bonds B. disulfide bridges C. peptide bonds D. electrostatic charges E. ionic bonds
A
Which of the following is not a polymer? A. glucose B. starch C. cellulose D. chitin E. DNA
D
Which of the following is not a protein? A. enzyme B. antibody C. keratin D. pectin E. collagen
B
Which of the following statements is true regarding the chemical reaction illustrated in Figure 3.11? A. It is a hydrolysis reaction. B. It results in a peptide bond. C. It joins two fatty acids together. D. It is a hydrolysis reaction and it results in a peptide bond. E. It is a hydrolysis reaction, it results in a peptide bond, and it joins two fatty acids together.
C
Which two functional groups are always found in amino acids? A. ketone and methyl B. carbonyl and amino C. carboxyl and amino D. amino and sulfhydryl E. hydroxyl and carboxyl
D
Which type of lipid is most important in biological membranes? A. oil B. triglyceride C. wax D. phospholipid E. fat
B
Why are human sex hormones considered to be lipids? A. They are essential components of cell membranes. B. They are not soluble in water. C. They are made of fatty acids. D. They are hydrophilic compounds. E. They contribute to atherosclerosis.
carboxyl group
acidic, can dissociate and release H+
amino group
basic, accepts H+ and becomes positively charged
carboxyl group
(-COOH)
carbonyl group
(>C-O)
amino group
-NH2
alcohol group
-O-H
A
. Which of the following best summarizes the relationship between dehydration reactions and hydrolysis? A. Dehydration reactions assemble polymers, and hydrolysis reactions break down polymers. B. Dehydration reactions eliminate water from lipid membranes, and hydrolysis makes lipid membranes water permeable. C. Dehydration reactions can occur only after hydrolysis. D. Hydrolysis creates monomers, and dehydration reactions break down polymers. E. Dehydration reactions ionize water molecules and add hydroxyl groups to polymers; hydrolysis reactions release hydroxyl groups from polymers.
A
.Polymers of polysaccharides, fats, and proteins are all synthesized from monomers by- A. the removal of water (dehydration reactions) B. the addition of water to each monomer C. the formation of disulfide bridges between monomers D. ionic bonding of the monomers E. connecting monosaccharides together
D
All of the following bases are found in DNA except A. guanine B. adenine C. thymine D. uracil E. cytosine