Biology 202 Exam 2 Questions and answers with accurate rationales(PASSED)
a molecule with the chemical formula c6h12o6 is probably a - (ANSWER)monosaccharide
different allés result in different traits because - (ANSWER)the amino acid sequence of the resulting
protein is different
what are chromosomes composed of - (ANSWER)dna and histone proteins
the transport of molecules against a concentration gradient across the membrane that requies an input
of energy is called - (ANSWER)active transport
starch and cellulose - (ANSWER)are polymers of glucose
which of the following statements is true for lipids - (ANSWER)lipids mix poorly with water
how do phospholipids interact with water molecules - (ANSWER)the polar heads interact with water; the
nonpolar tails do not
saturated fats - (ANSWER)contain more hydrogen than unsaturated fats that consit of the same number
of carbon atoms
phospholipids and triglycerides both - (ANSWER)have a glycerol backbone
Homo sapiens have 23 pairs of chromosomes. this implies that - (ANSWER)46 double-stranded DNA
molecules are present in each somatic cell
which of the following is true of unsaturated fats - (ANSWER)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 -
(ANSWER)increasing the proportion of unsaturated phopholipis in the membrane
, Biology 202 Exam 2 Questions and answers with accurate rationales(PASSED)
according to the fluid mosaic model, a membrane - (ANSWER)is composed of a fluid bilayer of
phospholipids with embredded amphipathic protiens
why are lipids and proteins free to move laterally in membranes - (ANSWER)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 - (ANSWER)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 - (ANSWER)small and hydrophobic
which of the following are least likely to diffuse through the phosolipid bilayer of a cell memebrane -
(ANSWER)small ions
which of the following would likely diffuse through the lipid bilayer of a plasma membrane most rapidly
- (ANSWER)o2
which of the following statements correctly describes osmosis - (ANSWER)in osmosis water moves
across a membrane from areas of lower solute concentration to areas of higher solute concentration
what will happen to a red blood cell, which has an internal ion content of about .9%, if it is placed into a
beaker of pure water - (ANSWER)the cell would swell because the water in the beaker is hypotonic
relative to eh cytoplasm of the RBC
according to the fluid mosaic model of membrane structure, proteins of the membrane are mostly -
(ANSWER)embedded in a lipid bilayer
which of the following statements is most likely true of a protein that cotransports glucose and sodium
ions into the intestinal cells of an animal - (ANSWER)a substance that blocks sodium ions from binding to
the cotransport protein will also block the transport of glucose
a molecule with the chemical formula c6h12o6 is probably a - (ANSWER)monosaccharide
different allés result in different traits because - (ANSWER)the amino acid sequence of the resulting
protein is different
what are chromosomes composed of - (ANSWER)dna and histone proteins
the transport of molecules against a concentration gradient across the membrane that requies an input
of energy is called - (ANSWER)active transport
starch and cellulose - (ANSWER)are polymers of glucose
which of the following statements is true for lipids - (ANSWER)lipids mix poorly with water
how do phospholipids interact with water molecules - (ANSWER)the polar heads interact with water; the
nonpolar tails do not
saturated fats - (ANSWER)contain more hydrogen than unsaturated fats that consit of the same number
of carbon atoms
phospholipids and triglycerides both - (ANSWER)have a glycerol backbone
Homo sapiens have 23 pairs of chromosomes. this implies that - (ANSWER)46 double-stranded DNA
molecules are present in each somatic cell
which of the following is true of unsaturated fats - (ANSWER)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 -
(ANSWER)increasing the proportion of unsaturated phopholipis in the membrane
, Biology 202 Exam 2 Questions and answers with accurate rationales(PASSED)
according to the fluid mosaic model, a membrane - (ANSWER)is composed of a fluid bilayer of
phospholipids with embredded amphipathic protiens
why are lipids and proteins free to move laterally in membranes - (ANSWER)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 - (ANSWER)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 - (ANSWER)small and hydrophobic
which of the following are least likely to diffuse through the phosolipid bilayer of a cell memebrane -
(ANSWER)small ions
which of the following would likely diffuse through the lipid bilayer of a plasma membrane most rapidly
- (ANSWER)o2
which of the following statements correctly describes osmosis - (ANSWER)in osmosis water moves
across a membrane from areas of lower solute concentration to areas of higher solute concentration
what will happen to a red blood cell, which has an internal ion content of about .9%, if it is placed into a
beaker of pure water - (ANSWER)the cell would swell because the water in the beaker is hypotonic
relative to eh cytoplasm of the RBC
according to the fluid mosaic model of membrane structure, proteins of the membrane are mostly -
(ANSWER)embedded in a lipid bilayer
which of the following statements is most likely true of a protein that cotransports glucose and sodium
ions into the intestinal cells of an animal - (ANSWER)a substance that blocks sodium ions from binding to
the cotransport protein will also block the transport of glucose
