Explain how Escherichia coli can grow with a doubling time of 20 minutes when chromosome replication takes 40 minutes
What will be an ideal response?
Answer: Answers should demonstrate understanding that a second round of replication will begin before the first round is finished under optimum growth conditions. Thus the cells can divide in less than 40 minutes, because it started copying the chromosome in the previous mother cell.
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Red light and phytochrome are involved in which of the following plant growth responses? Check all that apply.
_____ thigmotropic responses _____ inhibition of seed germination _____ elongation of etiolated shoots _____ detection of crowding by neighboring plants
Secondary endosymbiosis occurs when a
a. photosynthetic eukaryote engulfs a photosynthetic prokaryote. b. photosynthetic eukaryote engulfs a non-photosynthetic prokaryote. c. photosynthetic eukaryote engulfs a non-photosynthetic eukaryote. d. non-photosynthetic eukaryote engulfs a photosynthetic prokaryote. e. non-photosynthetic eukaryote engulfs a photosynthetic eukaryote.
A major difference between prokaryotes and eukaryotes is that although prokaryotes
A. do not have a nucleus, eukaryotes have a nucleus in their cells. B. have chloropast for photosynthesis, eukaryotes do not. C. have mitochondria, eukaryotes do not. D. have DNA, eukaryotes only have RNA. E. have cell walls, eukaryotes do not.
Which of the following statements is false?
a. Flowers are reproductive shoots. b. Trees are gametophytes. c. Sporophyte plants can reproduce asexually. d. Cells produced by mitosis are clones. e. Gametophytes are haploid.