Ozone molecules in the stratosphere shield the Earth from damaging UV radiation
___________________ Indicate whether the statement is true or false.
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The term used to describe the cloning of an entire plant from a single cell is ____
a. sexual meiosis b. tissue culture propagation c. reduced integration d. germination mitosis e. phototropism
By 3.2 billion years ago, chemosynthetic cells had
become established a. near deep-sea hydrothermal vents. b. in salt lakes. c. in hot, highly acidic, fresh-water springs. d. in deep oceanic sediments. e. in the upper sunlit waters of the open oceans.
How is the 4-letter language of nucleic acids converted into the 20-word language of amino acids?
a. The 4 nucleic acid bases combine in 2-letter combinations that define different amino acids. b. The 4 nucleic acid bases combine in 3-letter sequences that define different amino acids. c. Triplets of the 2-letter nucleic acid bases are translated into the 20 different amino acids. d. The 4 bases each specify 1 amino acid, which give rise to the remaining 16 amino acids. e. The 4 bases are first converted into tRNA molecules, which can each attach to 5 amino acids.
Which process converts the nucleotide language of mRNA into the amino acid language of a protein?
A) DNA replication B) transcription C) translation D) meiosis