Bio 202 Exam 2 Question and Answer [2026]
| UPDATED ACTUAL Exam | A+ Verified
• what are chromosomes composed of -✓✓ dna and histone proteins
• the transport of molecules against a concentration gradient across the membrane
that requies an input of energy is called -✓✓ active transport
• starch and cellulose -✓✓ are polymers of glucose
• which of the following statements is true for lipids -✓✓ lipids mix poorly with
water
• how do phospholipids interact with water molecules -✓✓ the polar heads interact
with water; the nonpolar tails do not
• saturated fats -✓✓ contain more hydrogen than unsaturated fats that consit of the
same number of carbon atoms
• phospholipids and triglycerides both -✓✓ have a glycerol backbone
• Homo sapiens have 23 pairs of chromosomes. this implies that -✓✓ 46 double-
stranded DNA molecules are present in each somatic cell
• which of the following is true of unsaturated fats -✓✓ they have double bonds in
their fatty acid chains
, • the membranes of winter wheat are able to remain fluid when it is extrmely cold
by -✓✓ increasing the proportion of unsaturated phopholipis in the membrane
• according to the fluid mosaic model, a membrane -✓✓ is composed of a fluid
bilayer of phospholipids with embredded amphipathic protiens
• why are lipids and proteins free to move laterally in membranes -✓✓ there are
only weak hydrophobic interactions in the interior of the membrane
• which of the following statements is a reasonable explanation for why unsatrated
fatty acids help keep a memebrane more fluid at lower temperature -✓✓ the double
bonds form kinks int he fatty acid tails, preventing adjavent lipids from packing
tightly
• what kinds of molecules pass through a cell membrane easily -✓✓ small and
hydrophobic
• which of the following are least likely to diffuse through the phosolipid bilayer of
a cell memebrane -✓✓ small ions
• which of the following would likely diffuse through the lipid bilayer of a plasma
membrane most rapidly -✓✓ o2
• which of the following statements correctly describes osmosis -✓✓ in osmosis
water moves across a membrane from areas of lower solute concentration to areas
of higher solute concentration
| UPDATED ACTUAL Exam | A+ Verified
• what are chromosomes composed of -✓✓ dna and histone proteins
• the transport of molecules against a concentration gradient across the membrane
that requies an input of energy is called -✓✓ active transport
• starch and cellulose -✓✓ are polymers of glucose
• which of the following statements is true for lipids -✓✓ lipids mix poorly with
water
• how do phospholipids interact with water molecules -✓✓ the polar heads interact
with water; the nonpolar tails do not
• saturated fats -✓✓ contain more hydrogen than unsaturated fats that consit of the
same number of carbon atoms
• phospholipids and triglycerides both -✓✓ have a glycerol backbone
• Homo sapiens have 23 pairs of chromosomes. this implies that -✓✓ 46 double-
stranded DNA molecules are present in each somatic cell
• which of the following is true of unsaturated fats -✓✓ they have double bonds in
their fatty acid chains
, • the membranes of winter wheat are able to remain fluid when it is extrmely cold
by -✓✓ increasing the proportion of unsaturated phopholipis in the membrane
• according to the fluid mosaic model, a membrane -✓✓ is composed of a fluid
bilayer of phospholipids with embredded amphipathic protiens
• why are lipids and proteins free to move laterally in membranes -✓✓ there are
only weak hydrophobic interactions in the interior of the membrane
• which of the following statements is a reasonable explanation for why unsatrated
fatty acids help keep a memebrane more fluid at lower temperature -✓✓ the double
bonds form kinks int he fatty acid tails, preventing adjavent lipids from packing
tightly
• what kinds of molecules pass through a cell membrane easily -✓✓ small and
hydrophobic
• which of the following are least likely to diffuse through the phosolipid bilayer of
a cell memebrane -✓✓ small ions
• which of the following would likely diffuse through the lipid bilayer of a plasma
membrane most rapidly -✓✓ o2
• which of the following statements correctly describes osmosis -✓✓ in osmosis
water moves across a membrane from areas of lower solute concentration to areas
of higher solute concentration
