In the United States, the largest group of endangered species is:
a. mammals.
b. flowering plants.
c. insects.
d. birds.
e. amphibians
b
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The best anticoagulant to prevent clotting of specimens, such as blood, bone marrow, and synovial fluid, which are submitted for recovery of all types of microorganisms, is:
a. sodium polyanethol sulfonate (SPS). b. heparin. c. citrate. d. ethylenediaminetetraacetic acid (EDTA).
__________ are the main components of cell
membranes. a. Triglycerides b. Phospholipids c. Unsaturated fats d. Steroids e. Fatty acids
Green and yellow wavelengths of light are useless to most plants.
a. true b. false
Which of the following statements about the cytoskeleton is false?
A) The cytoskeleton helps to support cells. B) Once laid down, the elements of the cytoskeleton are fixed and remain permanently in place. C) The cytoskeleton is composed of three types of fibers: microfilaments, microtubules, and intermediate filaments. D) The cytoskeleton plays an important role in amoeboid motion.