Parietal cells secrete pepsinogen
____________________ Indicate whether the statement is true or false.
F, Chief
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The Saguaro cactus is a large cactus found in some southwestern desert environments. It plays
a central role in providing habitat for a variety of other species, and if these cacti die or are removed from the ecosystem, biodiversity declines. Thus, the Saguaro cactus is a __________.
a. keystone species b. tertiary consumer c. generalist d. trophic level
What is the location of the third stage of aerobic respiration?
a. Matrix b. Inner mitochondrial membrane c. Chloroplast d. Stroma e. Cytoplasm
You have some old plastic Petri dishes that you would like to use for pouring bacteriological agar plates. The only method of physical sterilization is ultraviolet radiation sterilization with your UV light (you cannot use the autoclave because it will disfigure and melt the plastic). After sterilizing the plates, pouring the sterilized agar medium, and then leaving the plates out at room temperature for a day or two to let them solidify and dry, you find contaminating bacterial colonies growing on the agar. Predict what has happened in this situation.
A. The room temperature enhanced the growth of normal biota of the agar. B. The agar had bacteria in it, even after sterilization in the autoclave. C. Air got into the poured agar plates, contaminating them. D. The lids of the Petri dishes were inadvertently left on while being sterilized.
Clumping of antibodies and antigens is referred to as:
A) coagulation. B) antigen presentation. C) agglutination. D) neutralization.