Homeotic genes
A. are only present in vertebrates.
B. are only present in insects and vertebrates.
C. are found in all animals.
D. have widely varied functions from species to species.
E. are involved in the formation, but not the positioning, of organs.
C. are found in all animals.
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Motor neurons release the neurotransmitter acetylcholine (ACh) and acetylcholinesterase degrades ACh in the synapse. If a neurophysiologist applies onchidal (a naturally occurring acetylcholinesterase inhibitor produced by the mollusc Onchidella binneyi)
A) paralysis of muscle tissue B) gradual loss of resting potential C) convulsions due to constant muscle stimulation D) decrease in the frequency of action potentials E) no effect
The ______ of an organism refers to the alleles that are present.
A. genotype B. karyotype C. pedigree D. phenotype E. pleiotropy
Which of the following impacts occurs during surface mining for minerals like copper? a. None of these choices
b. Increased likelihood for fires. c. Increased aeration of the soil. d. Desalination of the soil. e. Contamination of nearby waterways.
Most people have a positive Rh factor.
a. true b. false