Which of the following observations were an outcome of studies by David Tilman and coworkers at Cedar Creek, Minnesota on ecosystem stability? Check all that apply.
_____ Plots with more species showed less year-to-year variation in biomass.
_____ Species-rich plots were less affected by drought than species-poor plots.
_____ Over-yielding was observed in more recent work at Cedar Creek.
_____ Nitrogen uptake and total biomass produced were negatively correlated to species richness.
_____ More diverse plots were less susceptible to invasion by new species.
__X__ Plots with more species showed less year-to-year variation in biomass.
__X__ Species-rich plots were less affected by drought than species-poor plots.
__X__ Over-yielding was observed in more recent work at Cedar Creek.
_____ Nitrogen uptake and total biomass produced were negatively correlated to species richness.
__X__ More diverse plots were less susceptible to invasion by new species.
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On mRNA molecules, a nontranslated sequence called the ________ usually precedes the initiation codon.
Fill in the blank(s) with the appropriate word(s).
Humans suffer from dementia (similar to Alzheimer's disease) if they eat flour made from cycad seeds because:
A. The seeds have high levels of manganese that is a cause of dementia. B. The seeds contain hallucinogenic drugs similar to LSD that causes dementia. C. The seeds have enzymes that break down brain tissue causing dementia. D. The seeds contain the amino acid BMAA that causes dementia. E. The seeds have enzymes that inhibit absorption of nutrients that are essential for the transmission of nervous impulses in brain cells.
The process of lymphoiesis goes on in all of the following organs except
A. the lymph nodes B. the spleen C. the red bone marrow D. the kidney E. the thymus
What are attributes of oral contraceptives? (Check all that apply.)A) They contain a progesterone and sometimes an estrogen analogue.B) The progesterone is in the 21-day pills, and the estrogen is in the 7-day pills.C) They help protect against ovarian and endometrial cancer.D) They are appropriate for use by smokers over age 35.E) They have a low failure rate of only 1% to 5% a year.F) They act by inhibiting LH and FSH secretion, inhibiting ovulation.
What will be an ideal response?