This is a practice in which a family produces enough food to feed itself. It accounts for perhaps 60% of
tropical deforestation.
a. monoculture
b. subsistence agriculture
c. slash-and-burn agriculture
d. cattle ranching
e. subsistance ranching
B
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Of the biomes listed, which is best adapted to seasonal fires?
A. Chaparral B. Tundra C. Broadleaf forests D. Coniferous forests
When comparing root systems of corn plants growing on a square foot in a cornfield with the root systems of natural prairie plants growing in a meadow, what result do you expect to see?
A) The overall mass of roots will be identical in a cornfield and on a meadow. B) The mass and length of roots in a cornfield will be higher because soil is fertilized. C) The mass and length of roots on a meadow will be higher because soil is poorer and there is higher diversity of plants. D) The overall mass of roots on a meadow will be lower, but the length will be higher since roots need to grow deeper to reach nutrients.
EMS (ethylmethane sulfonate) is mutagenic because __________
A) it breaks phosphodiester bonds B) it adds alkyl groups to bases C) it forms cross-links between DNA strands D) it makes DNA more susceptible to radiation E) it causes chromosomal deletions
Pathogenic and toxic forms of Croynebacterium diphtheriae develop from nontoxic Croynebacterium diphtheriae by a process of
A. Mutation B. Transduction C. Transformation D. Conjugation