Organs are composed of tissues, which are composed of cells. This is an example of which characteristic of life?
A. Living things grow and develop
B. Living things respond to stimuli
C. Living things maintain themselves by homeostasis.
D. Living things have levels of hierarchical organization.
E. Living things are adapted to the environment.
Answer: D. Living things have levels of hierarchical organization.
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Short hairlike structures on the cell surface that stir fluid around stationary cells are called:
a. cilia b. flagella c. intermediate filaments d. microfilaments e. pili
If the map distance between genes A and B is 20 map units and the map distance between genes B and C is 35 map units, what is the map distance between genes A and C?
A) 15 map units B) 55 map units C) More information is needed to distinguish between 15 and 55 map units. D) Gene C must be located on a different nonhomologous chromosome.
Which of the following combinations of molecules illustrated could be linked to form a nucleotide?
A) 1, 2, and 11 B) 3, 7, and 8 C) 5, 9, and 10 D) 11, 12, and 13
A pea is actually a seed.
a. true b. false