+ssRNA viruses:
A. Are converted to DNA before replication
B. Are converted into a dsRNA virus before replication
C. Are unable to make proteins directly
D. Do not need a prepackaged RdRp
E. None of the answers are correct
Ans: D. Do not need a prepackaged RdRp
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People who cannot become infected with HIV have
A) extra T cells. B) deletions in the genes encoding the CCR5 coreceptors. C) a gene encoding a protein that attacks the virus. D) anti-HIV antigens.
During the _______ period, no additional action potentials can be created.
a. absolute refractory b. conduction c. integration d. relative refractory
Suppose a cell lacks functional Shugoshin. What is the predicted effect on cohesin?
A) Cohesin will be cleaved prior to metaphase in mitosis. B) Cohesin will not be cleaved during mitosis or meiosis. C) Cohesin at the centromeres of sister chromatids will be cleaved during meiosis I. D) Cohesin on the arms of sister chromatids will be cleaved during meiosis II. E) Cohesin will be cleaved normally during mitosis and meiosis I.
Turbinates were found in therapsids, extinct reptiles thought to be ancestors of mammals. What could the researchers conclude from this observation?
A. Ectothermy arose before fur. B. Ectothermy arose after fur. C. Endothermy arose before fur. D. Endothermy arose after fur. E. Birds did not descend from reptiles.