The motile, feeding stage of protozoa is called the ________.
A. cyst
B. trophozoite
C. food vacuole
D. sporozoite
E. oocyst
Answer: B
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With __________, an animal learns to associate an
involuntary response to one stimulus with another stimulus. Fill in the blank(s) with the appropriate word(s).
The cells that produce testosterone are the ____
a. Leydig cells b. spermatogonia c. epididymis d. seminiferous tubule cells e. Sertoli cells
Among the eukaryotic microbes in the phytoplankton, the ________ are most noted for their contribution to carbon fixation.
A. dinoflagellates B. diatoms C. cyanobacteria D. green algae
The aquatic plant Elodea is commonly used to study photosynthesis. You put some Elodea in a test tube filled with water containing radiolabeled oxygen (18O), shine light on the test tube, and measure the rate of photosynthesis by counting oxygen bubbles released. At the end of your experiment, you would find the most 18O in
A. glucose. B. carbon dioxide. C. O2. D. in water for the most part, as water is not used in photosynthesis. E. in ATP.