Practice Test 2

Question 1

Answer 1

Question 2

Answer 2

Question 3

Answer 3

D. Disulfide bonds [69%]
Process of Elimination
Option A. Hydrogen bonds – This option is incorrect because hydrogen bonds are a form of intermolecular force, which results when hydrogen is either bonded to nitrogen, oxygen, or fluorine. Hydrogen bonding is observed between complementary nitrogenous bases (adenine — thymine and cytosine — guanine). Since hydrogen bonding is present in DNA, this option is incorrect.

Option B. Phosphodiester bonds – This option is incorrect because phosphodiester bonds are the result of a condensation reaction between the 3’ OH group of one nucleotide and the 5’ phosphate group of a separate nucleotide. This results in a linkage between adjacent nucleotides. These reactions form the negatively charged backbone of DNA molecules.

Option C. Covalent bonds – This option is incorrect. Covalent bonds form when two atoms share their electrons with each other. Phosphodiester bonds are considered covalent bonds and since phosphodiester bonds are seen within DNA, this option is incorrect.

Option E. Van der Waals forces – This option is incorrect. Van der Waals forces, also known as London dispersion forces, are present between all molecules, including DNA. Van der Waals forces result from a temporary and weak dipole-dipole interaction between two molecules in close proximity. Van der Waals forces can be observed between adjacent nucleotides in the DNA strand, therefore, this option is incorrect.

Question 4

Answer 4

Question 5

Answer 5

Question 6

Answer 6

Question 7

Answer 7

Question 8

Answer 8

Question 9

Answer 9

C. Vasopressin [74%]

Question 10

Answer 10

Question 11

Answer 11

Question 12

Answer 12

Question 13

Answer 13

Question 14

Answer 14

Question 15

Answer 15

C. Genetic equilibrium requires a lack of evolution [77%]

Question 16

Answer 16

B. Neutrophils [74

Question 17

Answer 17

Question 18

Answer 18

Question 19

Answer 19

Question 20

Answer 20

Question 21

Answer 21

D. Intermediate filaments [86%]

Question 22

Answer 22

Question 23

Answer 23

Question 24

Answer 24

Question 25

Answer 25

Question 26

Answer 26

Question 27

Answer 27

Question 28

Answer 28

Question 29

Answer 29

Question 30

Answer 30

Question 31

Answer 31

Question 32

Answer 32

Question 33

Answer 33

Question 34

Answer 34

Question 35

Answer 35

Question 36

Answer 36

E. Neural tube [86%]

Question 37

Answer 37

Question 38

Answer 38

Question 39

Answer 39

Question 40

Answer 40