A newly discovered microorganism has a circular chromosome that is complexed with histones, but not enclosed within a membrane. The plasma membrane lipids include glycerol dietethers and diglycerol tetraethers. There are no mitochondria or chloroplasts, but the cells do contain 70s ribosomes. This microbe most likely is ________.
A. a protozoan
B. a bacterium
C. an archaeon
D. a fungus
Answer: C
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DNA methylation of a gene during spermatogenesis would be most likely to result in
A. the inactivation of the paternal allele in the offspring. B. dosage compensation by the paternal allele. C. the inactivation of the maternal allele in the offspring. D. the inactivation of the X chromosome. E. dosage compensation by the maternal allele.
__________ fills spaces between cells. Fill in the blank(s) with the appropriate word(s)
What substances will release hydrogen ions when their concentration is low and accept them when
their concentration is high? a. salts b. acids c. bases d. buffers e. alkalines
If the haploid number of an organism is 6, the diploid number will be
A. 3. B. 6. C. 9. D. 12.