Which of the following is not true of the formation of a eukaryotic translation initiation complex?
A. eIF4F binds to the 5' cap of the mRNA.
B. eIF2 binds to the A site to block the binding of the initiating tRNA.
C. At least two GTP molecules are hydrolyzed per initiation event.
D. eIF1, eIF1A, eIF2, and eIF3 are displaced before the 60S subunit joins the 40S subunit.
B
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According to the phylogenetic tree showing evolutionary relationships among viruses in Figure 13.6, which one of the following is most closely related to the human lentivirus HIV2?
A. a horse lentivirus B. another human lentivirus C. a cow lentivirus D. a simian lentivirus E. a cat lentivirus
Among the eukaryotic microbes in the phytoplankton, the ________ are most noted for their contribution to carbon fixation.
A. green algae B. cyanobacteria C. diatoms D. dinoflagellates
Natural selection quickly eliminates harmful alleles from the population
Indicate whether the statement is true or false.
Which of the following are examples of kinetic energy?
A. electrons in chemical bonds of the food molecules, proton gradients established, ATP molecules B. All of the answer choices are correct. C. electrons from food molecules moving through the electron transport chain, and protons moving through ATPase D. protons moving through ATPase by facilitated diffusion, ATP molecules E. electrons from food molecules moving through electron transport chain, proton gradients established