In mammals, the brain region that has become especially important as a "relay center" for information passing from sensory structures to the cerebrum is the
A. hypothalamus.
B. cerebellum.
C. pons.
D. thalamus.
E. hippocampus.
Answer: D
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Place the steps in the correct order to reflect how a lethal dose may be determined. _____ Dilutions of virus are made to represent a range of concentrations. _____ Inoculated host cells are observed and the number of dead cells are counted. _____ The dilution which killed 50% of the tissue culture cells is identified. _____ Dilutions are inoculated into susceptible tissue cultures (or susceptible host organisms).
Fill in the blank(s) with the appropriate word(s).
Lymph moves throughout the lymph vessels due to ____
a. contraction of the heart b. conscious actions c. constriction of blood vessels d. dilation of blood vessels e. skeletal muscle and breathing movements
Which of the following is a property of all living organisms?
a. Reproduce using RNA. b. Use the sun to fuel metabolic processes. c. Grow and develop based on inherited RNA. d. Respond to stimuli in the external environment.
Microbial genomics is a rapidly growing field. Of great interest to geneticists is the search for new operons as new microbial genome sequences become available
What kind of "signature" or identifying feature would you look for as you searched new genomes for candidate operons?