Point mutations may have no effect on an organism if (select all correct choices):
A. they occur in a non-coding region of DNA.
B. the new codon codes for the same amino
acid as the original codon.
C. they occur only in somatic cells.
D. the new codon codes for an amino acid
that is the same size as the one coded for by
the original codon.
E. they occur only in germ cells.
A,B
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Otto Loewi demonstrated that neurons transmit signals across synapses
a. by electrical signals. b. by Vagusstoff. c. by acetylcholine. d. by chemical signals. e. by proteins
Trisomy 21 is the only autosomal trisomy that allows survival into adulthood
a. True b. False
The carrying capacity of the Earth for humans is influenced by
A. food and energy supply. B. disposal of waste products. C. interaction with other organisms. D. All of these answers are true.
Which of the following is a polymer?
A. testosterone, a steroid hormone B. cellulose, a plant cell wall component C. glucose, an energy-rich molecule D. triacylglycerol, or fat E. fructose, a component of sucrose