Photographs of cells from onion root tips are often used to show chromosomes primarily because these cells are:
A. diploid.
B. rapidly undergoing mitosis.
C. rapidly undergoing meiosis.
D. in stationary phase.
E. lacking organelles.
B
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Shewanella spp. show great metabolic flexibility and can use a variety of electron acceptors, including ________.
A. chromium and tellurite B. technetium and neptunium C. uranium and plutonium D. iodate and selnite
Answer the following statements true (T) or false (F)
1. Slime molds possess characteristics of both fungi and protozoa. 2. Protozoa in the category known as Mastigophora move by means of cilia. 3. A dimorphic fungus would exist as a mold inside the human body. 4. The organism that causes a “red tide” is an alga. 5. Volvox is a multicellular alga.
Answer the following statements true (T) or false (F)
1. A modern goal of systematics is to create taxa based on similarity of form and function, regardless of evolutionary relationships. 2. An assumption used for molecular clocks is that neutral mutations accumulate at a rapidly increasing rate over time between two species. 3. Alan Cooper, Cécile Mourer Chauviré, Geoffrey Chambers, Arndt von Haeseler, Allan Wilson and Svante Pääbo investigated the evolutionary relationship among some extinct and living species of flightless birds. They used tissue samples from museums and from living birds. This is an example of discovery-based science. 4. Horizontal gene transfer is thought to have been an important factor in the early evolution of the three domains.
When someone has cataracts, they may be able to have a surgical replacement of their cloudy lens with an artificial lens. The artificial lens implant will be clear, but it is also fixed in shape. Based on your knowledge of vision, would it usually be necessary to get a new prescription for their glasses following this surgery?
A. Yes, the artificial lens will be fixed, so it cannot give distance vision one moment and near vision the next. B. No, they would no longer need glasses after lens replacement surgery because a new lens would not need correction.