Plants lose several hundred H2O molecules for each CO2 that is fixed by photosynthesis because __________________. (Select all correct answer options.)
A. the diffusion gradient is many times larger
for H2O than CO2
B. H2O molecules are lighter than CO2
molecules
C. H2O molecules are consumed during
photosynthesis
D. the diffusive pathway for H2O and CO2 is
the same
A,B
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Answer the following statements true (T) or false (F)
1. Nitrogen is one of the most abundantly applied fertilizers worldwide. 2. Aluminum is not an essential mineral for plants and therefore may cause toxicity. 3. When a mycorrhizal fungus associates with the roots of a plant, the fungus usually causes harm to the plant. 4. Inexpensive sources of phosphorus fertilizers are nearly exhausted.
Researchers choose a sequence-based evolutionary tree based on which possible tree
A) requires the fewest mutations. B) compares two distant species. C) ignores incomplete datasets in the evaluation. D) is based on molecular clocks and not fossil evidence.
Which of the following statements regarding the flow of genetic information is false?
A) Polypeptides form proteins that determine the appearance and function of the cell and organism. B) Eukaryotic mRNA is processed in several ways before export out of the nucleus. C) Transcription occurs in the cytoplasm of eukaryotic cells. D) Ribosomes function as factories that coordinate the functioning of mRNA and tRNA.
A. How can nucleosome core particles be isolated from chromatin?
B. What molecular components were identified after this treatment was complete? C. What portion of the nucleosome was destroyed/removed during this treatment and what function does it normally serve?