The class of proteobacteria that may be incorporated into the gamma proteobacteria is the ________.
A. delta proteobacteria
B. alpha proteobacteria
C. beta proteobacteria
D. epsilon proteobacteria
Answer: C
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The ultimate, coordinated response of cells to a vast array of signals from the environment is known as ________.
Fill in the blank(s) with the appropriate word(s).
An environmental testing laboratory is unable to identify a single-celled organism isolated from a well water sample. Inspection of the microorganism with a compound microscope reveals that it uses pseudopodia for movement and is not enclosed within a mineral shell. Based on this information, this organism can be classified to which supergroup?
A. Opisthokonta B. Alveolata C. Amoebozoa D. Rhizaria E. Excavata
According to the diversity-stability hypothesis:
A. Genetic diversity is the most important part of ecosystem stability. B. A loss of any species from an ecosystem leads to an approximately equal decline in stability. C. The loss of a few species from an ecosystem does significantly affect ecosystem functioning. D. Losing even a few species from an ecosystem causes a drastic decline in ecosystem stability. E. Every species has an important role in ecosystem function, but we cannot predict the effect of species loss.
In a typical human cell, DNA polymerase synthesizes DNA at a rate of approximately 50 nucleotides per second. Human chromosome 1 contains about 250 million base pairs. If a single origin of replication were used, how long would it take the cell to copy this chromosome?
A) less than 24 hours B) 1 to 2 days C) 1 to 2 weeks D) 50 to 60 days E) 110 to 120 days