Four of the following statements correctly describe lichens. Which statement is the exception?
a. They inhabit harsh environments.
b. They contain a club fungus.
c. They may have proceeded the evolution of land plants.
d. They may be a mutualism between and alga and a fungus.
e. They can contain cyanobacteria.
ANSWER: b
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Prokaryotes ____
a. lack a nucleus b. are generally larger than eukaryotes c. are found only in certain niches d. have a narrow range of metabolic activities e. have a smaller biomass than plants
Where is the electron transport chain located in bacterial cells?
A. Mitochondrial inner membrane B. Plasma membrane C. Mitochondrial outer membrane D. Periplasm
Which of the following features is characteristic of all
life? a. organization of molecules into cells b. metabolic control using enzymes c. a continuous flow of sustaining energy d. DNA with its hereditary code e. all of these
Which of the following statements about homologous genes is true?
(a) For protein-coding genes, homologous genes will show more similarity in their amino acid sequences than in their nucleotide sequences. (b) Fewer than 1% of human genes have homologs in the nematode and the fruit fly. (c) Most homologous genes arose by gene duplication. (d) A gene in humans that has homologs in plants and prokaryotes will show the same level of similarity in nucleotide sequence when the human and prokaryotic sequences are compared as when the human and chimpanzee sequences are compared.