A scientist found an unweathered igneous rock that contained .025 g of potassium-40 and .075 g of argon-40. The half-life of potassium-40 is 1.3 billion years. The rock would be estimated to be
A. 2.6 billion years old.
B. 0.050 billion years old.
C. 1.3 billion years old.
D. 0.001875 billion years old.
E. 1.69 billion years old.
A. 2.6 billion years old.
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What is the difference between pollination and fertilization in flowering plants?
A) Fertilization precedes pollination. B) Pollen is formed within megasporangia so that male and female gametes are near each other. C) Pollination is the transfer of pollen from an anther to a stigma. Fertilization is the fusion of haploid nuclei. D) If fertilization occurs, pollination is unnecessary.
Genotype is to _____ as phenotype is to _____
A) DNA base sequence; physical traits that are products of the proteins produced B) heredity; DNA base sequence C) gene regulation; translation D) transcription; amino acid sequence
A regulon always includes at least two operons
Indicate whether the statement is true or false.
Thanks to the efforts of Matt Nader, Texas passed a law requiring that all high schools have ____
a. more CPR classes b. physicians at all football games c. rigorous physical examinations for all high school athletes d. automated external defibrillators available for emergencies e. coaches who do not over exert the school’s athletes