What RNA processing is involved in the production of rRNA?
What will be an ideal response?
Ans: rRNA genes encode several rRNA molecules. They are transcribed as a single unit. A series of cleavage (by endonucleases) and trimming (by exonucleases) reactions generate the mature rRNAs.
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Following the Deepwater Horizon accident in the Gulf of Mexico in 2010, bioremediation was used to eliminate much of the oil from the contaminated water. To encourage the growth of oil-degrading microbes, "fertilizer" including iron and nitrogen was added to the water. Which of the following statements regarding the growth of these microbes is incorrect?
A. The oil-degrading microbes used oil (hydrocarbons) as their carbon source. B. The concentration of sulfate in the Gulf of Mexico is sufficient for the growth of oil-degrading microbes. C. Large amounts of iron were needed, as iron is a macronutrient for oil-degrading microbes. D. Nitrogen gas (N2) present in air is not in a form that can be used by oil-degrading microbes.
What are plants that flower only once before they die, normally after two seasons of growth, called?
A. annuals B. biennials C. perennials D. monocots E. dicots
What would be an expected feature of a plasma membrane that had no integral membrane proteins?
A. The membrane would be unable to transport sodium ions B. The membrane would collapse C. The membrane would have no fluidity D. The membrane would have no cholesterol E. The membrane would not associate with peripheral membrane proteins
Water vapor contributes to global warming.
Answer the following statement true (T) or false (F)