Which group has silica shells similar to those of diatoms?
A) Apicomplexans
B) Ciliates
C) Euglenids
D) Dinoflagellates
E) Radiolarians
E
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The primary function of humoral immunity (humoral response) is to _____
A) defend against fungi and protozoa B) reject transplanted tissues C) protect the body against cells that become cancerous D) protect the body against extracellular pathogens E) defend against bacteria and viruses that have already infected cells
The movement of actin and myosin fibers in a muscle contraction contains all of the following steps EXCEPT
A. the myosin head attaches to the actin filament. B. the globular myosin head detaches from the actin filament. C. myosin rolls up from one end, forming a ball. D. the myosin head returns to its original conformation. E. the myosin filament advances relative to the actin filament.
The amount of dissolved oxygen in the water is an important factor used to assess the health of a lake. What is the relationship between the temperature of the water and the concentration of dissolved oxygen?
A) Cooler water temperatures prevent oxygen from being dissolved in the water. B) Warmer water temperatures decrease the amount of oxygen that can be dissolved in the water. C) Water temperature does not affect the amount of oxygen dissolved in the water. D) Warmer water temperatures increase the amount of oxygen that can be dissolved in the water.
All of the following are found in the Gram-Negative Bacteria cell EXCEPT
A. Lipid A B. Periplasmic space C. Peptidoglycan D. Teichoic acid E. Lipopolysaccharide