Exam 2 clicker questions

Question 1

What makes a biological membrane more fluid:
increasing the length of the fatty acids.
decreasing the saturation of the fatty acids.
decreasing the temp

Answer 1

decreasing the saturation of fatty acids

Question 2

the plasma membrane is composed of a phospholipid bilayer and associated proteins. what else is commonly found in the plasma membrane of animal cells:
nucleic acids.
free amino acids.
glycerol.
cholesterol.

Answer 2

cholesterol

Question 3

all proteins are free to move around laterally in the plasma membrane:
true or flase

Answer 3

false

Question 4

which of the following would most easily diffuse through the plasma membrane:
Na ion.
Cl ion.
glucose.
cortisol.

Answer 4

cortisol

Question 5

during osmosis water flows from a region of ____ solute conc to a region of ____ solute conc:
low; high.
high;low.
high;equal.
low;equal

Answer 5

low;high

Question 6

how is the protein moving through the membrane:
diffusion.
facilitated diffusion.
passive transport.
active transport.

Answer 6

active transport

Question 7

which of the following is an example of facilitated diffusion:
diffusion of a steriod.
diffusionwith a carrier proteins.
the sodium/potassium pump.

Answer 7

diffusion with a carrier protein

Question 8

which way is the net movement of water when a cell is in a hypertonic enviroment:
into the cell.
out of the cell.
water cannot move thorugh the memebrane.

Answer 8

out of the cell

Question 9

some prokaryotes have one of the following, which is never found in eukaryotes:
DNA.
Cell wall.
plasma membrane.
flagellum.
all of the above

Answer 9

all of the above

Question 10

cells are small because:
they require a slow surface to volume ratio.
they require a high surface to volume ratio.
plasma membranes have a size limit.
they have a limited amount of dna

Answer 10

they require a high surface to volume ratio

Question 11

photosynthetic bacteria undergo photosynthesis in:
flagella.
the golgi.
mitochondria.
chloroplasts.
folded sections of internal plasma membrane

Answer 11

folded sections of internal plasma membrane

Question 12

protein synthesis:
can occur in the golgi.
is preformed by ribosomes.
can occur on the er
can occur in the nucleus

Answer 12

is preformed by ribosomes and can occur on the er

Question 13

most proteins secreted from the cell require a signal sequence: true or false

Answer 13

true

Question 14

what is atp specifically used for:
a substrate for protein synthesis.
a substrate for lipid synthesis.
a substarte for dna synthesis.
a substrate for rna synthesis

Answer 14

substrate for rna synthesis

Question 15

which of the following is most likely to have similar uses in processes requiring energy to atp:
lysine.
phospholipids.
guanosine triphosphate
steriods

Answer 15

quanosine triphosphate

Question 16

predict which of the following transformations of elated molecules would include a change form more entropy to less:
the conversion of a polypeptide to amino acids.
the conversio of rna to nucleotides.
salt crystals dissolving in an aqwous solution
the conversion of monosaccharides to starch

Answer 16

the conversion of monosaccrides to startch

Question 17

why does adp have less potential energy than atp:
because atp has ribose as a sugar
because adp has only one phosphate group
because adp has only two phosphate groups
because atp has adenine in it

Answer 17

cause adp has two phosphate groups

Question 18

how do you speed up a reaction:
add more reactants.
change deltaG of the reaction
add a protease enzyme

Answer 18

add more reactants

Question 19

where does the energy for the reduction of NAD+ come from:
oxygen.
h2o.
NADH.
glucose

Answer 19

glucose

Question 20

which process produces the most atp by substarte-level phosphorylation:
glycolysis
pyruvate oxidation
citric acid cycle
glycolysis and the citric acid cycle prodice equal amounts

Answer 20

glycolysis and the citric acid cycle produce the same amount

Question 21

why do we breathe:
to obtain fuel for glycolysis.
to obtain fuel for the citric acid cycle
to obtain an oxidizing agent for the etc
to obtain oxygen for pyrivate oxidation

Answer 21

to obtain an oxidizing agent for the etc