Which organism is often isolated in the sputum of patients with cystic fibrosis?
a. Acinetobacter spp.
b. B. trematum
c. Burkholderia gladioli
d. S. maltophilia
C
The role of this organism in human disease is uncertain; however, it is occasionally found in the sputa of patients with cystic fibrosis, but clinical significance in this setting is uncertain.
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Bacterial oxidation of Fe2+ occurs BEST under which environmental condition?
A) cold temperature B) high sunlight C) low (acidic) pH D) nutrient-replete
In a biology lab exercise, you are asked to examine cells of a growing onion root tip that has been sectioned to show many cells. In most of the cells, you easily see the circular or oval nucleus as a uniformly filled space in a membrane outline. In a small percentage of cells, you see chromosomes as distinct strands just as cell division begins, and as it progresses, because the chromatin
A. becomes less tightly wound, to facilitate cell division.
B. increases in length, as replication adds DNA sections to the original.
C. becomes more tightly folded, increasing their visible length.
D. becomes less tightly folded, increasing their visible length.
E. becomes more tightly wound, to protect DNA, and to more easily manage cell division.
The stage of human development that occurs from implantation to about 8 weeks after fertilization is the
A. zygote. B. morula. C. gastrula. D. fetal stage. E. embryonic stage.
Relative to prokaryotic cells, eukaryotic cells are usually ________
A) larger and more complex B) smaller and simpler C) larger and equally complex D) smaller and more complex