The connection point of two sister chromatids is called the _____
a. chromatid
b. chromatin
c. centriole
d. centrosome
e. centromere
ANSWER: e
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The mathematical expression for the change in free energy of a system is ?G =?H - T?S. Which of the following is (are) correct?
A) ?S is the change in enthalpy, a measure of randomness. B) ?H is the change in entropy, the energy available to do work. C) ?G is the change in free energy. D) T is the temperature in degrees Celsius.
Cactus spines are modified leaves adapted for dry climates, while the leaves of the Venus fly trap plant are adapted to
capture insects. These structures are therefore ____.
a. analogous b. homologous c. recessive d. homozygous e. morphogenic
You have isolated DNA for PCR and accidentally added topoisomerase instead of polymerase to your sample. What would you expect if you ran this DNA sample on a gel?
A) The DNA would show increased supercoiling and have a lower electrophoretic mobility. B) The DNA would show decreased supercoiling and have a higher electrophoretic mobility. C) The DNA would show increased supercoiling and have a higher electrophoretic mobility. D) The DNA would show decreased supercoiling and have a lower electrophoretic mobility. E) The DNA would show decreased supercoiling, but electrophoretic mobility will be unaffected.
Compare the leakage rates of sodium and potassium into and out of a neuron at rest. How is the relationship between these rates best described?
A. Leakage of sodium ions out of the neuron is greater than leakage of potassium ions into the neuron. B. Leakage of potassium ions out of the neuron is equivalent to leakage of sodium ions into the neuron. C. Leakage of potassium ions into the neuron is greater than leakage of sodium ions out of the neuron. D. Leakage of potassium ions out of the neuron is greater than leakage of sodium ions into the neuron. E. Leakage of sodium ions into the neuron is greater than leakage of potassium ions out of the neuron.