The process that makes an exact copy of a cell's DNA is called
A.) conservation
B.) preservation
C.) replication
D.) synthesis
Ans: C.) replication
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Which one of the following statements about DNA is incorrect?
A. DNA typically exists in cells as a double helix. B. There are 10 base pairs per turn in a helical DNA molecule. C. DNA has a diameter of approximately 2 nanometers. D. The strands in DNA wrap around each other in a helix that coils to the right. E. All of the statements about DNA are correct.
Phytoplankton patchiness in the epipelagic can occur when:
a. water clarity declines. b. there is an influx of nutrients. c. surface waters plunge to depths. d. fish aggregate. e. hydrothermal vents erupt.
A reduced ability of the blood to carry oxygen is
A. anemia. B. edema. C. asthma. D. emphysema.
Choose the true statements about duplicate genes.
A. Duplicate genes can gain a derived function through subsequent mutation. B. Gene duplication rarely occurs in growth and development genes, immune system genes, and cell-surface receptor genes. C. Duplicate genes often share the same pattern of gene expression. D. Duplicate genes may retain their ancestral function by their resistance to mutation.