A field biologist finds an unfamiliar single-celled organism in a sample from the surface of a marshy area. What observations or tests would make it possible to determine whether it is a protozoan, fungus, or alga? Assume the PCR machine at the field station is not working, but all other equipment is
What will be an ideal response?
The presence of a cell wall would indicate the organism is either a fungus, or an alga.
The presence of pigments is an indication it is a photosynthetic organism, and if it has a cell wall, it is an alga. The identification would be further confirmed if the organism is diploid (observed during mitosis).
An organism with a cell wall but no pigments is probably a fungus. This identification can be verified by observing that the organism is haploid.
If the organism is a single-celled eukaryote without a cell wall, it is likely a protozoan. Motility (with flagella, cilia or pseudopodia) would help confirm this identification, although the absence of observable motility does not rule out protozoa.
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Which of the following statements about magnetotaxis in the anaerobic bacteria Aquaspirilium is not correct?
A. Aquaspirilium swim using a flagellum toward magnetic north. B. Aquaspirilium can be attracted to the side of a dish using a bar magnet. C. Aquaspirilium contain bits of magnetized iron oxide used in sensing the earth's magnetic field. D. The earth's magnetic field is on a decline that guides Aquaspirilium deeper into the sediment. E. Anaerobic bacteria from New Zealand that swim toward magnetic south immediately reverse their attraction to magnetic north when moved to a northern environment.
Most carbon dioxide is carried in blood as ___
which is formed in ___.
a. carbonic acid...the plasma b. the bicarbonate ion...red blood cells c. carbon dioxide...hemoglobin d. carbon dioxide...red blood cells e. the bicarbonate ion...the plasma
The breakdown of glucose to carbon dioxide and water is
A. a endergonic reaction in photosynthesis. B. an endergonic reaction in cellular respiration. C. an exergonic reaction in photosynthesis. D. an exergonic reaction in cellular respiration. E. None of the answers are correct.
Which of the following is NOT considered a peripheral lymphoid tissue?
A) bone marrow B) spleen C) appendix D) adenoids E) tonsils