During the Carboniferous period, photosynthesis in immense swamp forests removed ________ from the atmosphere, which produced a drier, cooler global climate and promoted the success of ________
A) oxygen; ferns
B) oxygen; seed plants
C) carbon dioxide; lycophytes
D) carbon dioxide; seed plants
Answer: D
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The main reason scientists thought that proteins, rather than DNA, were the carriers of genetic material
in the cell was:a. their presence within the nucleus. b. their abundance within the cell. c. the large number of possible amino acid combinations. d. their ability to self replicate within the cytoplasm. e. their ability to be exported from the cell.
When a DNA molecule containing a wrong base at one location in one strand is replicated:a
the mutation is corrected by the DNA polymerase enzyme. b. the mutation is ignored by the DNA polymerase enzyme. c. the mutation is copied into one of the two daughter molecules. d. the mutation is copied into both of the daughter molecules. e. the replication is stopped.
hemoglobin synthesis
What will be an ideal response?
Organelles such as mitochondria and chloroplasts are thought to have originated in eukaryotic cells via a process called
a. phagocytosis. b. endosymbiosis. c. endocytosis. d. autogenous formation.