Knockout experiments involving __________ genes in fruit flies (Drosophila melanogaster) revealed
local controls over gene expression. Fill in the blank(s) with the appropriate word(s).
ANS: homeotic PTS: 1 DIF: Moderate
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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.
New technology, such as AUVs, allows scientists to observe marine mammals in which situation?
A) In captivity B) From the surface of the ocean only. C) From stranded or dead animals washed up on beaches D) Underwater in the open sea
Hans Spemann has referred to which of the following structures as the primary organizer in the early development of amphibian embryos?
A) optic cup B) notochord C) neural tube D) dorsal ectoderm E) dorsal lip of the blastopore
Mammals such as the vampire bat have the ability to generate a urine with a concentration of approximately 3,600 milliosmoles (mOsm). If the concentration of their blood is approximately 300 mOsm, by producing a concentrated urine, their water loss is
A. Actually increased by approximately ½. B. Reduced by approximately ½. C. Reduced by approximately 11/12. D. Reduced by approximately 5/6. E. Not reduced.