Which of the following is a common human use of bacteria?
A. producing sugar
B. decomposition in sewage treatment plants
C. producing antibiotics
D. All of the above are correct.
B. decomposition in sewage treatment plants
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NASA has published a list of criteria for identifying fossil bacteria in samples from Mars, as part of a search for evidence of life. Which of the following is good evidence for the presence of bacterial cells?
A. No evidence of water in the surrounding mineral B. Three-dimensional organization of cells in a starburst pattern C. Absence of carbon in the material D. Cell size of 0.5 to 2 microns
This cellular structure lacks a membrane:
A. microbody B. endoplasmic reticulum C. Golgi body D. nucleus E. nucleoid
The ultimate source of all new alleles is
A) mutation. B) chromosomal duplication. C) genetic drift. D) natural selection.
Phase of cell division that occurs between prophase and metaphase and is characterized by attachment of the spindle fibers to the kinetochores of each sister chromatid.
What will be an ideal response?