A) DNA was entering into the infected bacteria.
B) the viruses did not contain protein.
C) the viruses did not contain DNA.
D) protein was entering into the infected bacteria.
E) genetic material normally contains radioactive isotopes.
A) the findings of Chargaff that DNA always had equal amounts of A and T and equal amounts of G and C.
B) Griffith's results with transformation.
C) the discovery that DNA is wound around histone proteins.
D) X-ray data from Rosalind Franklin.
E) understanding DNA replication.
A) are identical to each other.
B) are connected to each other by covalent chemical bonds.
C) both contain nucleotides, but the order of the nucleotides on the two strands is not related.
D) are oriented in the same direction.
E) are antiparallel to each other.
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(a) The daughter nucleus formed in radioactive decay is often radioactive. Let N10 represent the number of parent nuclei at time t = 0, N1(t) the number of parent nuclei at time t, and the decay constant of the parent. Suppose the number of daughter nuclei at time t = 0 is zero. Let N2(t) be the number of daughter nuclei at time t, and let be the decay constant of the daughter. Show that N2(t) satisfies the differential equation(b) Verify by substitution that this differential equation has the solutionThis equation is the law of successive radioactive decays. (c) 218Po decays into 214Pb with a half-life of 3.10 min, and 214Pb decays into 214Bi with a half-life of 26.8 min. On the same axes, plot graphs of N1(t) for 218Po and N2(t) for 214Pb. Let N10 = 1 000 nuclei, and choose values of t from 0 to 36 min in 2-min intervals. (d) The curve for 214Pb obtained in part (c) at first rises to a maximum and then starts to decay. At what instant tm is the number of 214Pb nuclei a maximum? (e) By applying the condition for a maximum dN2/dt = 0, derive a symbolic equation for tm in terms of and . (f) Explain whether the value obtained in part (c) agrees with this equation.