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28 Cards in this Set
- Front
- Back
Nucleotide |
In a nucleic-acid chain, a subunit that consists of a sugar, a phosphate, and a nitrogenous base |
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Deoxyribose |
A five-carbon sugar that is a component of DNA nucleotides |
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Nitrogenous Base |
An organic base that contains nitrogen, such as a purine of pyrimidine; a subunit of a nucleotide in DNA and RNA |
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Purine |
A nitrogenous base that has a double-ring structure; one of the two general categories of nitrogenous bases found in DNA and RNA; either adenine or guanine |
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Pyrimidine |
A nitrogenous base that has a single-ring structure; one of the two general categories of nitrogenous bases |
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Base-Pairing Rules |
The rules stating that cytosine pairs with guanine and adenine pairs with thymine in DNA, and that adenine pairs with uracil in RNA |
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Complementary Base Pair |
The nucleotide bases in one strand of DNA or RNA that are paired with those of another strand; adenine pairs with thymine or uracil, and guanine pairs with cytosine |
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Base Sequence |
The order of nitrogenous bases on a chain of DNA |
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DNA Replication |
The process of making a copy of DNA |
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Helicase |
An enzyme that separates DNA strands |
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Replication Fork |
A Y-shaped point that results when the two strands of a DNA double helix separate so that the DNA molecule can be reeplicated |
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DNA Polymerase |
An enzyme that catalyzes the formation of the DNA molecule |
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Mutation |
A change in the nucleotide-base sequence of a gene or DNA molecule |
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Ribonucleic Acid (RNA) |
A natural polymer that is present in all living cells and that plays a role in protein synthesis |
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Transcription |
The process of forming a nucleic acid by using another molecule as a template; particularly the process of synthesizing RNA by using one strand of a DNA molecule as a template |
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Translation |
The portion of protein synthesis that takes place at ribosomes and that uses the codons in mRNA molecules to specify the sequence of amino acids in polypeptide chains |
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Protein Synthesis |
The formation of proteins by using information contained in DNA and carried by mRNA |
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Ribose |
A five-carbon sugar present in RNA |
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Messenger RNA (mRNA) |
A single-stranded RNA molecule that carries the instructions from a gene to make a protein |
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Ribosomal RNA (rRNA) |
An organelle that contains most of the RNA in the cell and that is responsible for ribosome function |
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Transfer RNA (tRNA) |
An RNA molecule that transfers amino acids to the growing end of a polypeptide chain during translation |
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RNA Polymerase |
An enzyme that starts (catalyzes) the formation of RNA by using a strand of a DNA molecule as a template |
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Promotor |
A nucleotide sequence on a DNA molecule to which an RNA polymerase molecule binds, which initiates the transcription of a specific gene |
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Termination Signal |
A specific sequence of nucleotides that marks the end of a gene |
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Genetic Code |
The rule that describes how a sequence of nucleotides, read in groups of three consecutive nucleotides (triplets) that correspond to specific amino acids, specifies the amino acid sequence of a protein |
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Codon |
In DNA, a three-nucleotide sequence that encodes an amino acid or signifies a start signal or a stop signal |
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Anticodon |
A region of tRNA that consists of three bases complementary to the codon of mRNA |
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Genome |
The complete genetic material contained in an individual |