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22 Cards in this Set
- Front
- Back
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what is the correct sequence of the segments of the cell cycle?
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G(1), S, G(2), M
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the "point of no return" or "start" that triggers the commitment to divide takes place at which stage of the cell cycle?
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G1
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compared to cell division in prokaryotes, cell division in eukaryotes is more complicated because eukaryotes _______
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have much more DNA
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cytokinesis in plant cells is accomplished by _______
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the formation of a cell plate
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cytokinesis is accomplished by _______
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a contractile ring made of actin filaments
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the collapsing and folding of the DNA molecule is accomplished with the aid of positively charged proteins called ______
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histones
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which of the bases is not in DNA?
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U (urasil)
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the genetic code contains ______ codons
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64
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information flows from DNA to RNA during _______ and from RNA to protien during ______
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transcription
translation |
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the structure of DNA is classically described as a ______
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double helix
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how many amino acids are used to synthesize protiens?
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20
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how many codons are stop codons?
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3
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the nucleotides sequence of three bases required to specify one amino acid is called a _____
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codon
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the parts of the message of mRNA that are removed during splicing are called _____
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introns
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the parts of the message on mRNA that are spliced together (not removed) to provide the information needed to make a protien are called __________
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extrons
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restrition enzymes ar especific in that ______
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they will only cut DNA at a short, defined nucleotide sequence
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when alexander fleming first descovered penicilin, the biggest obstacle to its use in treating humans was that __________
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the original fungal source of the penicilin produced very little of the drug
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who has identical DNA
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identical twins
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humans began selecting other organisms with preferred genotypes during ______
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the agricultural revolution
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traits affected by two or more genes are _________
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polygenic
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organisms that carry recombinant DNA in their genomes are _____ organisms
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transgenic
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the DNA molecule that consists of two or more segments that are not found together in nature is said to be _____
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recombinant
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