AP/IB Bio Chapter 2& 3 Exam

Question 1

Saturated fatty acids and unsaturated fatty acids differ in

A. the consistency at room temp;

b. the number of carbon-to-carbon bonds;
c. the number of hydrogen atoms present
d. all of the above are differences between saturated and unsaturated fatty acid

Answer 1

d

Question 2

Which of the following carbohydrates would NOT be a molecule used for energy storage?

A. Cellulose

b. glycogen
c. starch

D. All of the above

Answer 2

A

Question 3

Which functional group will attach to a hydrocarbon chain to form alcohol?

a. hydroxyl
b. amino
c. carboxyl
d. carbonyl
e. phosphate

Answer 3

a

Question 4

Organic Molecules are those that contain at least

a. carbon and oxygen
b. carbon and hydrogen.
c. carbon
d. carbon, hydrogen & oxygen

Answer 4

b

Question 5

A hyrdrocarbon is hydrophobic

a. except when it has an attached ionized functional group.
b. in carboydrates but not in lipids
c. only in the living cell environment
d. at all times

Answer 5

A

Question 6

What term is used for molecules that have identical molecular fomulas but the atoms in each molecule are arranged differently?

A. isomer

b. organic
c. isotope
d. homomolecules
e. balanced

Answer 6

A

Question 7

Answer 7

Cholesterol

Question 8

What is the molecular foumla for 5 glucose molecules?

A. C30 H50 O25

B. C30 H60 O30

C. C6 H24 O12

D. C30 H52 O26

Answer 8

A

Question 9

A plysaccharide is a plymer made up of whic kind of monomers?

A. alernativing sugar and phospate groups

b. amino acids
c. fatty acids and glycerol
d. simple sugars
e. nucleotides

Answer 9

D

Question 10

A lipid is a polymer made up of which kind of monomers?

A. amino acids

b. nucleotides
c. alternating sugar and phosphate groups
d. glucose or modified glucose molecules
e. fatty acids and gylcerol

Answer 10

E

Question 11

A dehydradration reaction can also be called a (an) ____________ reaction since it forms water.

a. Condensation
b. Monomer Formation
c. Isomeric
d. An energy-releasing
e. Hydrolysis

Answer 11

A

Question 12

Which of the following are structural carbohydrate molecules?

A. starch and cellulose

b. starch and glycogen
c. gylcogen and cellulose
d. glycogen and chitin
e. cellulose and chitin

Answer 12

E

Question 13

Indentify this molecule

Answer 13

carbohydrate

Question 14

If an animal needed to store energy for the long-term use, but not be encumbered with the weight of extra tissue, which is the best molecule for storage?

a. complex cellulose molecules
b. gycogen with extensive side branches of glucose
c. fructose and glucose in the form of honey
d. starch
e. high-calorie fat molecules

Answer 14

E

Question 15

A peptide bond is found in which type of biological molecule?

a. protein
b. nucleic acid
c. lipid
d. carobohydrate

Answer 15

A

Question 16

The alpha helix and beta sheet are found at which level of protein organization?

a. quaternary structure
b. primary structure
c. tertiary structure
d. secondary structure

Answer 16

D

Question 17

Afer eating eggs for breakfast you return in the evening dunk the dishes in the water and notice the yellow streaks remain “dried on”. However after soaking awhile the complex or various egg yolk molecules easily “washes off”. What has happened?

Answer 17

Heating denatured the egg protein molecules, unorganized condensation reactions then formed bonds in the drying egg, and soaking in water eventually resulted in hydrolysis reactions where water broke these bonds.

Question 18

Which of these statements is not true about DNA?

a. It is the genetic material of the cell.
b. the sugar and phosphate groups form the backbone of the molecule
c. it contains the sugar ribose
d. it forms a double helix
e. Adenine paris with thymine and guanine pairs with cytosine

Answer 18

C

Question 19

Fish sperm is composed mostly of the male fish’s DNA. If we tested a sample chemically, we should find relatively high amounts of:

a. globular proteins and stored fats
b. amino acids and unsaturated fats
c. phospholipids and steroids
d. triglycerids and ATP
e. nitorgenous bases, sugar and phosphate groups

Answer 19

E - Note it is DNA we are talking about

Question 20

Which figure is unsaturated fat?

Answer 20

See picture

Question 21

A polypeptide has an amino acid sequence of alanine-leucine-tryptophane-glycien-valine-alanine. This chain of amino acids is further organized inot a helix that in turn, folds in around itself to form a globular sturcture. The primary sturcture of this polypeptic is

a. alpha helix
b. globular
c. alanine-leucine-tryptophaned-glycien-faline-alanine
d. a pleated sheet

Answer 21

C

Question 22

If a segment of DNA has 20% adenine in its base composition, what percent thymine is there?

A. 80%

b. 60%

C. 20%

d. 40%

Answer 22

C

Question 23

Due to an increased risk of heart disease many doctors have suggested shifting our diet to include more oils instead of fats. As you cook dinner tonight the recipe calls for 2 tbs of oil. What is the most likely source of the oil you should use in preparing the meal?

a. melting butter
b. lard that was left at room temp
c. canola or olives
d. bees wax

Answer 23

C

Question 24

WShich of the following would be a proposed mechanism by which stomach acids work?

A. antacids contain molstly water so they neutralize the solutions

b. antacids are bases and by definition can absorb H + out of the solution
c. antacids are bases and by definition can absorb OH - out of the solution
d. Antatcids adilute the solution therefore lowering the pH

Answer 24

B

Question 25

Which of the following elements would be the most reactive wit other elements?

A. helium #2

b. neon #10
c. boron #5
d. argon #18

Answer 25

C

Question 26

If the atomic number of an element is 6 and the atomoic mass is 12.01, how many protons are there in the nucleus?

A. 24

B. 12

C. 6

D. 52

Answer 26

C