BMS 300 EXAM 1 – QUIZZES QUESTIONS
AND ANSWERS
Water molecules are attracted to each other and form ________ bonds. -
ANSWER Hydrogen
A bond in which electrons are shared between atoms is a _______ bond. -
ANSWER Covalent
Which of the following is NOT true about hydrophilic molecules? - ANSWER
They have equal sharing of electrons across all the atoms in the molecule
Which of the following is true about hydrophilic molecules? - ANSWER They
interact with the dipole moment in water
They diffuse easily in water
__________ pressure is the driving force of water through aquaporins. -
ANSWER Osmotic
T or F: Triglycerides are composed of 1 long chain fatty acid and three
glycerols - ANSWER False
In triglycerides, a fatty acid is joined to glycerol by a(n) __________ bond. -
ANSWER Covalent (ester)
,Two solutions are separated by a membrane containing only channels
permeable to water, that is, aquaporins. The solution in the left-hand
compartment contains 30 millimolar NaCl, which completely dissociates, and
the right hand compartment contains 60 millimolar urea, which is a small
charged molecule but does not dissociate. Which of the following statements is
correct? - ANSWER Water will not flow because osmotic forces are balances
The part of an amino acid that makes one amino acid different from another is
the _____. - ANSWER R-Group
Alpha helix - ANSWER hydrogen bonding occurs within an amino acid strand
Beta-pleated sheet - ANSWER hydrogen bonding occurs between amino acid
strands
To form a chain of amino acids, several amino acids are liked via what bond? -
ANSWER Peptide bond
In a phospholipid bilayer, how would hydrophobic and hydrophilic R groups of
a transmembrane protein orientate itself? - ANSWER Hydrophilic R groups:
face inward to form a polar/charged channel
Hydrophobic R groups: face outward to interact with phospholipid tails
T or F: Alpha helices are more likely to be found spanning membranes than beta
sheets - ANSWER True
R groups can be. - ANSWER polar
, charged
uncharged
What protein structure allows enzymes to bind its substrate? - ANSWER
Tertiary
The amino acids that can be found on the outside of a protein when placed in
water are: - ANSWER hydrophilic
What is a histone? - ANSWER A protein in eukaryotic cell nuclei that package
and order the DNA into structural units called nucleosomes
T or F: Prokaryotes organize their cellular machinery in membrane bound
organelles. - ANSWER False
T or F: Excluding mitosis/meiosis, DNA never leaves the nucleus - ANSWER
True
Eukaryotic DNA is packaged: - ANSWER by wrapping around histones to
form condensed chromosomes located in the nucleus of the cell
Produce proteins - ANSWER Ribosomes
Permit RNA to move from the nucleus to the cytoplasm - ANSWER Nuclear
pores
DNA --> RNA --> Protein - ANSWER Central dogma
AND ANSWERS
Water molecules are attracted to each other and form ________ bonds. -
ANSWER Hydrogen
A bond in which electrons are shared between atoms is a _______ bond. -
ANSWER Covalent
Which of the following is NOT true about hydrophilic molecules? - ANSWER
They have equal sharing of electrons across all the atoms in the molecule
Which of the following is true about hydrophilic molecules? - ANSWER They
interact with the dipole moment in water
They diffuse easily in water
__________ pressure is the driving force of water through aquaporins. -
ANSWER Osmotic
T or F: Triglycerides are composed of 1 long chain fatty acid and three
glycerols - ANSWER False
In triglycerides, a fatty acid is joined to glycerol by a(n) __________ bond. -
ANSWER Covalent (ester)
,Two solutions are separated by a membrane containing only channels
permeable to water, that is, aquaporins. The solution in the left-hand
compartment contains 30 millimolar NaCl, which completely dissociates, and
the right hand compartment contains 60 millimolar urea, which is a small
charged molecule but does not dissociate. Which of the following statements is
correct? - ANSWER Water will not flow because osmotic forces are balances
The part of an amino acid that makes one amino acid different from another is
the _____. - ANSWER R-Group
Alpha helix - ANSWER hydrogen bonding occurs within an amino acid strand
Beta-pleated sheet - ANSWER hydrogen bonding occurs between amino acid
strands
To form a chain of amino acids, several amino acids are liked via what bond? -
ANSWER Peptide bond
In a phospholipid bilayer, how would hydrophobic and hydrophilic R groups of
a transmembrane protein orientate itself? - ANSWER Hydrophilic R groups:
face inward to form a polar/charged channel
Hydrophobic R groups: face outward to interact with phospholipid tails
T or F: Alpha helices are more likely to be found spanning membranes than beta
sheets - ANSWER True
R groups can be. - ANSWER polar
, charged
uncharged
What protein structure allows enzymes to bind its substrate? - ANSWER
Tertiary
The amino acids that can be found on the outside of a protein when placed in
water are: - ANSWER hydrophilic
What is a histone? - ANSWER A protein in eukaryotic cell nuclei that package
and order the DNA into structural units called nucleosomes
T or F: Prokaryotes organize their cellular machinery in membrane bound
organelles. - ANSWER False
T or F: Excluding mitosis/meiosis, DNA never leaves the nucleus - ANSWER
True
Eukaryotic DNA is packaged: - ANSWER by wrapping around histones to
form condensed chromosomes located in the nucleus of the cell
Produce proteins - ANSWER Ribosomes
Permit RNA to move from the nucleus to the cytoplasm - ANSWER Nuclear
pores
DNA --> RNA --> Protein - ANSWER Central dogma
