What effect would an "endocrine disruptor" that blocks thyroxine have on amphibians?
What will be an ideal response?
Amphibians require thyroxine to trigger metamorphosis. If thyroxine secretion were blocked, then amphibians would fail to undergo metamorphosis and remain in the tadpole form.
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Using the NeoR/Tk system of introducing gene replacements into mice (as described in the text), which of the following would identify those mouse cells that were the result of homologous recombination?
A. NeoR only B. Tk only C. NeoR and Tk D. Neither NeoR or Tk
The molecules that bind to a repressor and cause it to no longer bind to the operator are called
A. activators. B. repressors. C. introns. D. inducers.
What is the age of the twig in the accompanying figure?
a. 0 years
b. 1 year
c. 2 years
d. 3 years
e. 5 years
Photosynthetic organisms convert the energy of ______ into chemical energy.
a) Electrons b) Protons c) Photons d) Hydrogen atoms