What substance required for aerobic metabolism is supplied to the body cells by respiration?
A. Oxygen
B. Carbon dioxide
C. Hemoglobin
D. Nitrogen
E. Glucose
Answer: A
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Triploblastic organisms give rise to ___ germ layers, which include _______
A. two; ectoderm and endoderm B. two; endoderm and mesoderm C. three; ectoderm, mesoderm, and endoderm D. three; ectoderm, metoderm, and endoderm
The base of the food web in the deep sea is:
a. phytoplankton. b. algae. c. seagrasses. d. sinking dead matter. e. viruses.
In Figure 3.1, line "c." points to the microscope's
a. Illuminator. b. Condenser. c. Ocular lens. d. Objective lens.
To be an effective antibiotic or chemotherapeutic agent, it is necessary
Select one: a. not to kill the human host or cause allergic reactions. b. to be able to kill a bacterial cell only. c. not to kill the human host or cause allergic reactions AND to be able to kill a bacterial cell only. d. to change the genome of the bacterial disease agent. e. to stop any universal living cell process.