A total of ______ codons code for ______ commonly occurring amino acids.
a. 20; 64
b. 64; 20
c. 4; 20
d. 20; 4
b. 64; 20
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Organisms develop a normal morphology because cells can receive and interpret
A. extracellular positional information. B. intracellular positional information. C. both extracellular and intracellular positional information. D. signals from other developing organisms. E. all of the signals described in the choices.
In any experiment, changes to the dependent variable based on the manipulations of the independent variable are
measured. When determining the action spectrum of a given plant, what is the independent variable and what is the dependent variable?
a. independent = absorption of light; dependent = wavelength b. independent = wavelength; dependent = absorption of light c. independent = rate of O2 release in photosynthesis; dependent = absorption of light d. independent = wavelength; dependent = rate of O2 release in photosynthesis e. independent = rate of O2 release in photosynthesis; dependent = wavelength
Many alleles cause phenylketonuria (PKU). A unique mutation found only in Yemenite Jews is probably
A) more ancient than other PKU mutations. B) a result of genetic drift. C) due to a strong heterozygote advantage. D) identical to the original allele.
Substances that enter a reaction are termed ____
a. intermediates b. enzymes c. energy carriers d. reactants e. end products