Which of the following supports the argument that viruses are nonliving?
A) They lack genetic material.
B) They are not cellular.
C) Their DNA does not encode proteins.
D) They have RNA rather than DNA.
E) They do not evolve.
Answer: B
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Eukaryotic DNA methylation occurs on which base?
A. guanine B. cytosine C. thymine D. adenine E. thymine and adenine
A plant with parallel veins and floral parts in threes or multiples of three would be classified as:
a. a monocot. b. a gymnosperm. c. a eudicot. d. a gnetophyte. e. a cotyledonous plant.
Dispersion is
A. the spatial distribution of abiotic factors. B. the ability of an individual to move. C. the spatial distribution of individuals. D. the rate of movement of a population. E. the timing of reproduction.
What kind of cell junctions allow rapid flow of substances into the cytoplasm of adjacent cells?
A) plasmodesmata and gap junctions B) adhering junctions and tight junctions C) tight junctions and plasmodesmata D) gap junctions and adhering junctions