In humans, the surface area of the small intestine is
A. 300 square meters.
B. 3 square meters.
C. 3,000 square meters.
D. 300,000 square meters.
E. 3 square centimeters.
Answer: A
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Evaluate the following statement about heat: Heat is released in all energy conversion processes as a byproduct.
A. False, heat is released in most but not all energy conversion processes. B. False, heat is never released as a byproduct. C. True. D. False, heat is released as a byproduct only in a few energy conversion processes.
Scientists have developed an ointment to decrease muscle inflammation after intense workouts or trainings. To test the product, 99 weight lifters are divided into three equal groups. Group 1 is given the actual ointment, Group 2 is given an inactive ointment that looks and smells like the active ointment, and Group 3 is not allowed to use any treatment. Group 2 has been given
A. a placebo. B. a standardized variable. C. a control variable. D. the active ointment. E. an independent variable.
Suppose that you encounter an antigen for the first time. What types of cells stored in your lymph nodes can be activated in case you encounter the antigen again?
A) memory cells B) effector cells C) phagocytic cells D) helper T cells
These creatures are heterotrophs with restricted mobility, have cell walls made up of cellulose, and carry out normal mitosis.
A. euglenoids B. sporozoans C. fungi D. molds