A mouse gene was identified and determined to be required for formation of heart muscle. A gene with a similar sequence was identified in the human genome. What experiment could scientists do to determine if the mouse and human genes have similar functions?
A) The scientist could search the human genome for genes that encode proteins that are identical to the protein encoded by the mouse gene.
B) The scientist could place the normal human gene into normal mice and see if the resulting mice are viable.
C) The scientist could place the normal human gene into mutant mice to see if heart muscle forms in the mouse.
D) The scientist could place the mutant mouse gene into humans to see if humans develop without heart muscle.
C) The scientist could place the normal human gene into mutant mice to see if heart muscle forms in the mouse.
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Which of the following features distinguishes all hormones from neurotransmitters?
A. Hormones require large concentrations to have an effect, while neurotransmitters require only low concentrations. B. A hormone affects reproductive functions, while neurotransmitters control all other processes. C. Hormones travel via the blood to a target tissue, while neurotransmitters cross the synaptic cleft to a postsynaptic cell. D. Hormones are steroids, while neurotransmitters are amino acids.
The ecological footprint of the human species is about
A) 80% of Earth's biocapacity. B) equal to Earth's biocapacity. C) 80% greater than Earth's biocapacity. D) 50% greater than Earth's biocapacity. E) 50% of Earth's biocapacity.
All of the following are characteristics of spread plates except ________.
A. spread plates readily grow anaerobic bacteria B. spread plates are typically inoculated with a bent glass rod C. they have colonies that grow on the surface of the agar D. specimens are typically diluted prior to inoculation of a spread plate
What do autotrophs require in order to produce food for themselves and all the heterotrophs?
A. an energy source, inorganic nutrients B. an energy source, water C. sunlight, inorganic nutrients D. heat, water E. sunlight, organic nutrients