On a field study in Costa Rica, you discover a new species of frog! After careful work to determine the size and range of the population, you conclude sadly that the species has very few individuals in an ever-shrinking limited range. The entire species could be wiped out at any time. When you write up your report on the frog, how should you describe its status?
A. Threatened
B. Endemic
C. Extinct
D. Conservative
E. Endangered
Answer: E
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Which of the following represents the correct order?
Shown below are steps in making a transgenic plant. 1. Expose plant cells to Agrobacterium tumefaciens 2. Place plant cells on selective medium 3. Transform the recombinant plasmid into Agrobacterium tumefaciens 4. Insert gene of interest into Ti plasmid 5. Place plant cells on growth medium with plant hormones A. 5 - 1 - 4 - 3 - 2. B. 4 - 3 - 1 - 2 - 5. C. 4 - 1 - 3 - 5 - 2. D. 2 - 4 - 1 - 3 - 5. E. None of the choices shows the correct order.
When extra juvenile hormone is experimentally administered to worker bees (Apismellifera), they ____
a. revert to performing duties of younger bees b. live longer and produce more offspring c. begin to mate and lay eggs d. produce more chemicals that reinforce memory e. develop impaired memories
In a polar covalent bond, the atoms of the different elements do not share electrons equally because
a. one is a metal and one is a non-metal. b. both are metals. c. both are non-metals. d. one element has more neutrons. e. one element has more protons.
Transcription factors include ______________.
A. promoters and insulators B. silencers and enhancers C. activators and repressors D. activators, repressors, and translational factors E. enhancers and repressors