A normally harmless substance that produces an immune response in some people is a(n):
a. pathogen
b. cytokine
c. histamine
d. allergen
e. antibody
d
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A marine fish with a cold body temperature that matches its cold surroundings is an example of rev
A. negative feedback. B. regulating. C. conforming. D. conditioning.
GnRH-producing cells in the brains of male cichlids are larger in territorial individuals
Indicate whether the statement is true or false.
According to the figure, the alga’s photosynthetic
pigments absorb a. high energy wavelengths of light only. b. low energy wavelengths of light only. c. both high and low energy wavelengths of light. d. high to medium energy wavelengths of light. e. medium to low energy wavelengths of light.
Motility of bacteria can be observed as spreading growth over the agar surface. Which of the following bacterial structure(s) is/are used for motility?
A. Pilus(i) B. Flagellum(a) C. Capsule D. Lipopolysaccharide E. Cytoplasmic membrane