A seedling no longer needs its stored food sources once it develops
a. an embryo.
b. cotyledons.
c. leaves.
d. roots.
C
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Which of the following rules apply to the synthesis of nucleic acids?
a. Nucleotides are added to the 5? end of nucleic acids. b. The synthesis of nucleic acids cannot occur without the presence of an enzyme to catalyze the reaction. c. Strands are synthesized in a parallel direction such that one end of the double-stranded product has the 3? ends and other has the 5? ends. d. Complementary pairing between bases is required for copying nucleic acids.
____________________ is a process in which unrelated species in separated parts of a biome develop similar characteristics, such as water-storing stems in North American cacti and African euphorbs.
Fill in the blank(s) with the appropriate word(s).
Which of the following viral types enter animal cells via fusion with the animal cell membrane?
A. non enveloped viruses B. naked viruses C. enveloped viruses D. All of these choices are correct.
One event occurring during prophase is ________.
Fill in the blank(s) with the appropriate word(s).