Why are living organisms such an important component of soil? What will be an ideal response?
Concepts to Consider: Bacteria and fungi--decompose organic matter, thus releasing essential
minerals into soil. Earthworms--dig tunnels that aerate soil; deposit castings on surface of soil, thereby
bringing nutrients from deeper layers to upper layers. Ants--aerate soil through the construction of
tunnels and chambers; bring food, which decays and contributes to organic matter in soil, back to their
nests.
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Which is not a hypothesis that attempts to explain the latitudinal diversity gradient?
A. Species in tropical habitats have had longer to evolve and diversify. B. Temperate communities have fewer species due to the need to adapt to a wider range of weather conditions. C. Tropical areas have larger population sizes for a given species. D. A given species in tropical habitats may be more spread out, leaving room in between for others. E. Tropical areas generally have more parasites that may attack particular types of trees, thereby affecting their distribution.
In mammalian cells, the mRNA sequence elements that target the mRNA for rapid degradation are called:
A. AU-rich elements. B. upstream open reading frames. C. age responsive elements. D. enhancers.
Food is sent along the GI tract by means of a wavelike process called ________
Fill in the blank(s) with correct word
If a short sequence of DNA is 5' AATTGCCGT 3', its complement is
A. 5' AAAACGCCA 3'. B. 3' TTAAGCCGA 5'. C. 3' TTAACGGCT 5'. D. 5' TTAACGGCA 3'. E. 3' TTAACGGCA 5'.