A genetic mutation results in the inability for a cycad to produce coralloid roots. What types of soils would be least conducive to the survival of this cycad relative to members of the species not affected by this mutation?
A. Soils saturated with water.
B. Drier soils.
C. Soils with lower mean temperatures.
D. Soils with lower nitrogen.
E. Soils with lower pH.
D. Soils with lower nitrogen.
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Most ectomycorrhizae produce signaling molecules that limit the growth of root hairs.
Answer the following statement true (T) or false (F)
Cell-signaling molecules are generally which type of macromolecule?
A. protein B. nucleic acid C. carbohydrate D. polysaccharide E. lipid
Which of the following is not a eukaryotic retrotransposon?
A. gypsy B. Ty elements C. LINEs D. SINEs E. Tc1/mariner
Possessing the entire sequence of a particular human genome may not be as useful as we think. Why not?
A. Every human genome is different enough that knowing ONE human's DNA sequence can't tell us almost anything about ALL humans. B. It's not the DNA sequence that matters-we need to know the mRNA sequence of the human genome. C. Due to the presence of introns/exons, and splicing of RNA after transcription, the DNA sequence doesn't necessarily tell us the exact number/type of proteins that will eventually be made from it. D. The amount of "junk DNA" present in the human genome masks any useful genetic information that we'd like to obtain.