Pheromones are detected in the ____
a. nasal epithelium
b. vomeronasal organ
c. olfactory bulb
d. thalamus
e. cerebral cortex
ANSWER: b
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Which phyllotaxes allow for leaves on a stem to lie flat without bending or breaking?
a. spiral and opposite b. alternate and whorled c. alternate and opposite d. spiral and whorled
In which of the situations below would a plant be at greatest risk for the formation of air bubbles in the xylem stream?
A. during the night, when transpiration is low B. during the afternoon, when transpiration is highest C. in the early morning, with cooler temperatures and calm winds D. in the day during a drought E. the risk is the same at any time of day
Which of the following are limitations of antibiotics?
a. Mass production of antibiotics is extremely difficult. b. Antibiotics may be toxic. c. The cost of producing antibiotics is high, which in turn leads to higher prices for consumers. d. Treatment with antibiotics can lead to the emergence of resistant strains. e. Antibiotics are not effective in treating viral infections.
Which of the following describes a mechanism that eukaryotic organisms can employ to alter protein production as an alternative to regulating transcription initiation?
A. Catabolite repression plays a role in the synthesis of proteins that break down alternatives to glucose-if the substrate is not present, the proteins will not be made. B. During times of cell starvation, the second messenger ppGpp destabilizes the DNA open complexes that code for rRNA and tRNA, saving energy by halting protein synthesis. C. RNA molecules within the spliceosome can direct alternative splicing of the primary transcript so that different proteins can be made from the same coding region. D. A phosphorelay signal transduction mechanism directs the repression or induction of certain eukaryotic genes to regulate the protein end-products.