The salinity of a small inland lake has recently started to increase. Researchers are planning to study the lake over several decades to investigate how freshwater organisms survive significant changes in their natural habitat. Which of the following physiological mechanisms will the researchers most likely observe among the surviving organisms in the lake?
(A) Prokaryotic organisms will use various mechanisms to counteract swelling of cells as a result of increased water uptake.
(B) Single-celled organisms will use various mechanisms to counteract the increased flow of water from cells to the environment.
(C) Eukaryotic organisms will use various mechanisms to counteract the diffusion of positively charged ions across the cell membrane.
(D) Multicellular organisms will use various mechanisms to counteract the loss of cell adhesion as a result of calcium deficiencies.
Ans: (B) Single-celled organisms will use various mechanisms to counteract the increased flow of water from cells to the environment.
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The tissue found in the center of a root is
a. xylem. b. endodermis. c. cortex. d. phloem. e. pith.
During prophase, ________________ condense(s) into visible chromosomes.
a. chromatin b. centrioles c. centromeres d. kinetochores e. colchicine
Protists in this group have a pellicle, and a light-sensitive organ called the stigma.
A. euglenoids B. dinoflagellates C. choanoflagellates D. foraminifera
Answer the following questions true (T) or false (F)
1. Protists reproduce through sexual as well as asexual means, depending on their life stage. 2. When infected with Toxoplasma gondii, a protist, symptoms are always present within two weeks. 3. Tonsils at the back of the throat, the appendix, and Peyer's patches of the small intestine are all examples of mucosa-associated lymphoid tissue (MALT) found along the GI tract.