Which of the following allows the compilation of time-of-entry maps?
A) the use of many replicates of each experiment
B) the use of appropriate controls repeatedly
C) the fact that gene entry can proceed in either direction
D) the observation that Hfr genes recombine so efficiently
E) the recognition of phenotype interaction
C
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In the nucleotide excision repair system, which of the following proteins is responsible for recognizing a thymine dimer to be repaired?
A. UvrA/UvrB B. UvrC C. UvrD D. UvrE
CO2 and H2O are converted to HCO3? and H+ in the blood of the lungs
Indicate whether the statement is true or false.
Consider a U-tube that initially contains pure water on one side of a selectively permeable membrane
and water plus solute on the other side. Which of the following best describes what will happen next? a. Solute molecules diffuse across the membrane faster than water molecules. b. The fluid level rises on the side containing the pure water. c. The diffusion of water molecules causes an osmotic pressure to build up in the tube. d. Solute molecules are transported across the membrane by facilitated diffusion. e. Some water molecules become "bound up" with solute molecules and do not diffuse freely.
A potential shortcoming of the probit/logit models is that to get consistent estimates of the parameters:
A. coefficient estimates cannot be evaluated against alternative hypotheses. B. moment conditions are required for each parameter to be estimated. C. the unobservables must be distributed via the standard normal (for probit) and logistically (for the logit). D. the determining function must be linear.