PCB 3134 Practice Exam 3 Questions
With Complete Solutions
According to the DNA double helix model, the double helix makes one complete
turn every ______ nucleotide residues
6
10
12
8
3.4 - ANSWER 10
To which end of the microtubules are tubulin subunits primarily added in vitro?
none of the listed
the plus end
the minus end
the N-terimal end
the C-terminal end - ANSWER the plus end
According to what we have learned, which of the following structures can be
found in plants?
none of the others
desmosome
gap junction
tight junction
adherens junction - ANSWER none of the others
An enzyme that creates transient breaks in one strand of the DNA duplex and
then allows the intact, complementary strand to undergo controlled rotation,
relaxing the supercoiled molecule is called a ____________
isomerase I
type I topologicase
type II topologicase
type II topoisomerase
type I topoisomerase - ANSWER type I topoisomerase
What happens immediately after ATP binds to a myosin head during muscle
contraction?
, ATP binding induces release of the bound ADP.
ATP binding induces the detachment of the myosin head from the actin filament.
ATP binding induces cross-bridge formation with other myosin filaments
ATP binding induces the association of the myosin head with the actin filament -
ANSWER ATP binding induces the detachment of the myosin head from the actin
filament.
Cholesterol molecules disrupt the close packing of the fatty acyl chains and
interfere with their mobility. The presence of cholesterol tends to __________ and
__________ fluidity.
decrease transition temperature, decreases
increase transition temperature, decreases
increase transition temperature, increases
decreases transition temperature, increases
abolish sharp transition temperature, creates a intermediate - ANSWER abolish
sharp transition temperature, creates a intermediate
Release of a clathrin-coated vesicle from the plasma membrane during
endocytosis requires a GTP-binding protein named ____________.
AP2 adaptor
elastin
dynamin
GGA adaptor
triskelion - ANSWER dynamin
DNA renaturation is the basis for many DNA analysis methods. Which of the
following is not a favor influencing the rate of DNA renaturation?
the ionic strength of the solution
the concentration of DNA
the incubation temperature
the size of the interacting DNA molecules
the presence of enzymes - ANSWER the presence of enzymes
During muscle contraction, the length of which region of the sarcomere stays
unchanged?
I bands
none of the above
A bands
H zones
sarcomere itself - ANSWER A bands
With Complete Solutions
According to the DNA double helix model, the double helix makes one complete
turn every ______ nucleotide residues
6
10
12
8
3.4 - ANSWER 10
To which end of the microtubules are tubulin subunits primarily added in vitro?
none of the listed
the plus end
the minus end
the N-terimal end
the C-terminal end - ANSWER the plus end
According to what we have learned, which of the following structures can be
found in plants?
none of the others
desmosome
gap junction
tight junction
adherens junction - ANSWER none of the others
An enzyme that creates transient breaks in one strand of the DNA duplex and
then allows the intact, complementary strand to undergo controlled rotation,
relaxing the supercoiled molecule is called a ____________
isomerase I
type I topologicase
type II topologicase
type II topoisomerase
type I topoisomerase - ANSWER type I topoisomerase
What happens immediately after ATP binds to a myosin head during muscle
contraction?
, ATP binding induces release of the bound ADP.
ATP binding induces the detachment of the myosin head from the actin filament.
ATP binding induces cross-bridge formation with other myosin filaments
ATP binding induces the association of the myosin head with the actin filament -
ANSWER ATP binding induces the detachment of the myosin head from the actin
filament.
Cholesterol molecules disrupt the close packing of the fatty acyl chains and
interfere with their mobility. The presence of cholesterol tends to __________ and
__________ fluidity.
decrease transition temperature, decreases
increase transition temperature, decreases
increase transition temperature, increases
decreases transition temperature, increases
abolish sharp transition temperature, creates a intermediate - ANSWER abolish
sharp transition temperature, creates a intermediate
Release of a clathrin-coated vesicle from the plasma membrane during
endocytosis requires a GTP-binding protein named ____________.
AP2 adaptor
elastin
dynamin
GGA adaptor
triskelion - ANSWER dynamin
DNA renaturation is the basis for many DNA analysis methods. Which of the
following is not a favor influencing the rate of DNA renaturation?
the ionic strength of the solution
the concentration of DNA
the incubation temperature
the size of the interacting DNA molecules
the presence of enzymes - ANSWER the presence of enzymes
During muscle contraction, the length of which region of the sarcomere stays
unchanged?
I bands
none of the above
A bands
H zones
sarcomere itself - ANSWER A bands
