Biology: The Dynamic Science 5th
Edition Chapter 5, bio test 1500 Exam
Actual Questions and Answers 2026
the thin layer of lipids and proteins that separates the inside of a
cell from its external surrounding -
correct answer ✅plasma membrane
two major types of lipids in a biological membrane -
correct answer ✅phospholipids and sterols
phospholipids have a ---- end containing a phosphate group linked
to one of several alcohols or amino acids -
correct answer ✅polar
phospholipids have a ---- end containing two fatty acid tails -
correct answer ✅nonpolar
the polar end of a phospholipid is ---- -
correct answer ✅hydrophilic
the nonpolar ends of a phospholipid are ---- -
correct answer ✅hydrophobic
,Biology: The Dynamic Science 5th
Edition Chapter 5, bio test 1500 Exam
Actual Questions and Answers 2026
the nonpolar part of sterols are packed in with the ----- -
correct answer ✅phospholipid hydrocarbon chains
Membrane lipids only rarely flip-flop between the two layers
because their polar heads are attracted by ---------- to the water
molecules of the aqueous solutions on either side of the
membrane. These attractions keep the heads facing outward
toward the aqueous solution, and make transitions between layers
of the membrane energetically unfavorable. -
correct answer ✅hydrogen bonds
transmembrane proteins that help a certain substance or class of
closely related substances to cross the membrane.
examples include channel proteins & ion pumps -
correct answer ✅transport proteins
membrane proteins that recognize and bind specific molecules in
the EXTRAcellular environment -
correct answer ✅receptors
, Biology: The Dynamic Science 5th
Edition Chapter 5, bio test 1500 Exam
Actual Questions and Answers 2026
many of these proteins are membrane proteins, orientated in the
membrane so they act on extracellular molecules
i.e. the smooth ER has these to catalyze lipid synthesis and
metabolism -
correct answer ✅enzymes
this transport depends on concentration differences on both sides
of the membrane. it moves molecules from high to low
concentration. no energy required. -
correct answer ✅passive transport
transport which moves substances against their concentration
gradients. it uses energy like ATP -
correct answer ✅active transport
a type of passive transport in cells in which molecules move from
areas where there are more of them to areas where there are
fewer of them -
correct answer ✅diffusion
Edition Chapter 5, bio test 1500 Exam
Actual Questions and Answers 2026
the thin layer of lipids and proteins that separates the inside of a
cell from its external surrounding -
correct answer ✅plasma membrane
two major types of lipids in a biological membrane -
correct answer ✅phospholipids and sterols
phospholipids have a ---- end containing a phosphate group linked
to one of several alcohols or amino acids -
correct answer ✅polar
phospholipids have a ---- end containing two fatty acid tails -
correct answer ✅nonpolar
the polar end of a phospholipid is ---- -
correct answer ✅hydrophilic
the nonpolar ends of a phospholipid are ---- -
correct answer ✅hydrophobic
,Biology: The Dynamic Science 5th
Edition Chapter 5, bio test 1500 Exam
Actual Questions and Answers 2026
the nonpolar part of sterols are packed in with the ----- -
correct answer ✅phospholipid hydrocarbon chains
Membrane lipids only rarely flip-flop between the two layers
because their polar heads are attracted by ---------- to the water
molecules of the aqueous solutions on either side of the
membrane. These attractions keep the heads facing outward
toward the aqueous solution, and make transitions between layers
of the membrane energetically unfavorable. -
correct answer ✅hydrogen bonds
transmembrane proteins that help a certain substance or class of
closely related substances to cross the membrane.
examples include channel proteins & ion pumps -
correct answer ✅transport proteins
membrane proteins that recognize and bind specific molecules in
the EXTRAcellular environment -
correct answer ✅receptors
, Biology: The Dynamic Science 5th
Edition Chapter 5, bio test 1500 Exam
Actual Questions and Answers 2026
many of these proteins are membrane proteins, orientated in the
membrane so they act on extracellular molecules
i.e. the smooth ER has these to catalyze lipid synthesis and
metabolism -
correct answer ✅enzymes
this transport depends on concentration differences on both sides
of the membrane. it moves molecules from high to low
concentration. no energy required. -
correct answer ✅passive transport
transport which moves substances against their concentration
gradients. it uses energy like ATP -
correct answer ✅active transport
a type of passive transport in cells in which molecules move from
areas where there are more of them to areas where there are
fewer of them -
correct answer ✅diffusion
