AAMC BIO VOL 2 QPACK

Question 1

which nitrogenous bases are purines?

Answer 1

guanine and adenine

Question 2

which nitrogenous bases are pyrimidines?

Answer 2

cytosine, thymine, and uracil

Question 3

allosteric site

of an enzyme

Answer 3

a region of an enzyme that allows activator or inhibitor molecules to bind to the enzyme that either activate or inhibit enzyme activity

Question 4

active site

of an enzyme

Answer 4

a region of the enzyme where substrate molecules bind and catalyze the reaction resulting in the production of particular products

Question 5

describe the flow of ions during an action potential

Answer 5

Na+ flow into the cell during depolarization
K+ flows out of the cell during repolarization

Question 6

key difference between bacteria and viruses

Answer 6

bacteria: cells that can survive on their own, inside or outside the body
viruses: a non-living collection of molecules that need a host to survive

Question 7

prokaryotic cells lack….

Answer 7

lack a nucleus and other membrane bound organelles

Question 8

glucose path within the cell

Answer 8

glucose enters the cell
glycolysos converts glucose to pyruvate in the cytoplasm
pyruvate enters mitochondria
krebs and ETC occur in mitochondria

Question 9

gram negative vs gram positive bactria (stian colour)

Answer 9

gram negative: pink/red
gram positive: purple/blue

Question 10

gram negative vs gram positive cell wall

Answer 10

gram negative: thin peptidoglycan layer, outer membrane
gram negative: thick peptidoglycan later, no outer membrane

Question 11

cell stages

Answer 11