The most precise method of obtaining estimates of the absolute ages of geological deposits is
A. measure the ratios of various radioactive isotopes in the deposits.
B. measure rates of sedimentary rock formation.
C. make salinity measurements in ocean sediment deposits.
D. study the sequence of fossil types in the deposits.
E. apply the principle of superposition (younger deposits above older deposits).
Answer: A
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Which of the following is true of carbon?
A) It forms only polar molecules. B) It can form a maximum of three covalent bonds with other elements. C) It is highly electronegative. D) It can form both polar and nonpolar bonds.
Which of the following has the phases of the Calvin-Benson cycle in the correct order, starting with the entry of ribulose 1,5-bisphosphate?
A. Carboxylation phase, reduction phase, regeneration phase B. Reduction phase, carboxylation phase, regeneration phase C. Carboxylation phase, regeneration phase, reduction phase D. Regeneration phase, carboxylation phase, reduction phase
Amino acids that contain many methyl (-CH3) groups
A. are considered hydrophilic. B. are non-polar. C. carry a positive charge. D. carry a negative charge. E. are considered hydrophilic AND carry a positive charge.
The number of genes in the human genome is estimated to be between
A. 20,000 and 25,000. B. 50,000 and 75,000. C. 150,000 and 200,000. D. 5,000 and 10,000. E. 80,000 and 100,000.