All cells in an individual organism contain the exact same DNA, but they can perform
different functions.
a. False, different cells have different functions and thus different genes.
b. True, each cell only activates specific portions of its DNA.
c. False, cells divide repeatedly and DNA changes occur during this time.
d. True, all cells are inherited from a single parent.
B
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Which is not involved in adaptive immunity?
A. antibody B. T cell C. B cell D. tear flow
All of the following are functions of the circulatory system EXCEPT
A. blood clotting and immune defense. B. temperature regulation. C. oxygen, nutrient, and waste transport. D. creation of red and white blood cells. E. hormone transport.
What defines radial symmetry?
A. Only one plane of symmetry splits the organism into equal halves. B. Any plane of symmetry passing through the center of the organism splits it into equal halves. C. No planes of symmetry exist; the organism cannot be split into equal halves. D. Only four planes of symmetry passing through the center of the organism splits it into equal halves.
What is the function of companion cells?
a. These cells provide metabolic support to vessel elements. b. These cells provide metabolic support to sieve elements. c. These cells provide metabolic support to tracheids. d. These cells prevent water from entering the endodermis. e. These cells control the opening and closing of stomata.