Bacteria and archaea use the same four bases in their DNA as eukaryotes. This supports which of the following statements?
A. All three domains arose from a common ancestor.
B. DNA was the original genetic material.
C. Bacteria, archaea, and eukaryotes contain the same set of genes.
D. DNA evolved independently at least three times.
E. Bacteria, archaea, and eukaryotes could interbreed.
A. All three domains arose from a common ancestor.
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Multigene families arise from _____
a. a single gene duplication event b. repeated cycles of gene duplication followed by mutation
c. single point mutations d. exon shuffling e. deletions of genes
Which of the following organic macromolecules provides energy as well as structure to plants and animals?
a. proteins b. lipids c. carbohydrates d. nucleic acids
Which of the following is false concerning eugenics?
A. The eugenics movement passed laws meant to eliminate bad genes from the human gene pool. B. Supporters of eugenics encouraged sterilization of the unfit. C. Eugenics methods have been highly successful in reducing the frequencies of bad recessive alleles from the human population. D. Eugenics methods have been unsuccessful, because recessive alleles are hidden in the heterozygous condition and can be passed on to offspring.
Concentration of Na+ is (i) ______ in cytosol compared to extracellular space of neuron. This uneven distribution of Na+ is generated by (ii)________________.
a) (i) lower, (ii) Na+-K+ ion pump b) (i) higher, (ii) Na+-K+ ion pump c) (i) lower, (ii) Voltage gated Na+ channel d) (i) higher, (ii) Voltage gated Na+ channel