BIOL 2160 Exam 2 kahoot

at a membrane potential of -120mV, which force has a stronger effect on K+?

electrical

at a membrane potential of -70 mV, which force has a stronger effect of K+?

chemical

at a membrane potential of +70 mV, which force has a stronger effect on Na+?

electrical

the chemical force for Na+ always wants to move Na+

into the cell

the chemical force for K+ always wants to move K+

out of the cell

K+ crossing the membrane at -100mV will make the membrane potential more

positive

Na+ crossing the membrane at +40 mV will make the membrane potential more

positive

at a membrane potential of +10mV, you would expect K+ to

exit the cell

at a membrane potential of -60 mV, you would expect Na+ to

enter the cell

one purpose of the Na+/K+ ATPase is to move Na+ ____ the cell

out of

if a cell is placed in a hypertonic environment, you would expect water to ___ the cell

exit

if a cell with 5M internal sucrose is placed in a 3M sucrose solution, water will

enter the cell

true or false: facilitated diffusion never requires energy

true

the membrane potential will always be approaching the equilibrium potential of the most ____ ion

permeable

gap junctions are a form of ___ cellular communication

direct

which of these is the same as a receptor turnover?

degredation

exposure to opiates results in receptor

downregulation

exposure to nicotine results in receptor

upregulation

which kind of tolerance results from exposure to nicotine in tobacco form?

pharmacokinetic and pharmacodynamic

the area of the brain that is involved in chemical addiction uses which neurotransmitter?

dopamine

which type of ligand will require a second messenger?

hydrophilic and lipophobic

when bound to GDP, a G-protein is

inactive/OFF

true or false: G-proteins have the ability to open AND close ion channels

true

the most common response to a hydrophobic ligand is

a change in protein synthesis

which type of virus is HPV?

DNA

what is the 3rd most common type of cancer in women?

cervical

which HPV protein causes receptor dimerization?

E5

cancer cells have ___ actin microfilaments than normal cells

less/fewer

in human bladder cancer cells, mutated Ras hydrolyzes GTP too

slowly

cancer cells will usually have an enlarged ___

nucleolus

true or false: cyclins have enzymatic activity

false

which cell cycle checkpoint is considered to be the most crucial?

G1

which type of genes are BRCA-1 and BRCA-2?

caretaker/DNA repair genes

cancer patients are given ___ to stimulate RBC production

erythropoietin

tamoxifen deprives cells of

estrogen