During the first major divergence of life the
atmosphere was
a. high oxygen, high carbon dioxide.
b. high hydrogen, low oxygen.
c. changing from anaerobic to aerobic.
d. firmly in the age of aerobes.
e. all of these.
Answer: b
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Transcription continues until:
A. all bases in the DNA are copied. B. a stop codon is encountered. C. a terminator sequence is encountered. D. a ribosome pulls RNA polymerase off the DNA. E. a transcription factor signals the end of the gene.
In ciliates, the ____ is used for ____
a. gullet; digestion b. cilia; flexible support c. pellicle; digestion d. contractile vacuole; food gathering e. pellicle; water balance
The rate of carbon uptake increases only when plants allocate carbon to the production of
A) roots. B) fruits. C) leaves and stems. D) flowers.
What is the final result of mitosis in a human?
A) genetically identical 2n somatic cells B) genetically different 2n somatic cells C) genetically identical 1n somatic cells D) genetically identical 2n gamete cells