Which of the following causes a dividing cell to pinch in two by contracting like a purse string?
A. centrioles
B. actin filaments
C. microtubles
D. pili
E. intermediate filaments
Answer: B
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Red muscle fibers get their color from _____
a. ATP c. myoglobin b. myosin d. collagen
________ attractions are the only ones that all molecules have regardless of what they are composed of.
A. Hydrogen bonding B. Ion-ion interactions C. London dispersion forces D. Dipole-dipole attractions
Which of the following is NOT a characteristic of all living things?
A) metabolism B) motility C) growth D) reproduction E) responsiveness
Which of the following statements is TRUE?
A) Both members are harmed in a symbiotic relationship. B) Members of a symbiotic relationship cannot live without each other. C) A parasite is not in symbiosis with its host. D) Symbiosis always refers to different organisms living together and benefiting from each other. E) At least one member must benefit in a symbiotic relationship.