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24 Cards in this Set
- Front
- Back
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Which BEST describes the relationship between nucleic acids and genes?
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One long DNA molecule that includes many genes
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What represents a similarity between RNA and DNA?
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Has nucleotides consisting of phosphate, sugar, and a nitrogenous base
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All of the following are directly directly involved in translation EXCEPT:
a. DNA b. tRNA c. ribosomes d. mRNA e. amino acids |
A. DNA
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A protein includes the sequence pre-pro-lys-gly-phe-pro...What is the sequence in DNA that codes for this part of that protein?
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AAA-GGG-TTT-CCC-AAA-GGG
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Which enxyme minimizes errors during DNA replication?
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Nuclease
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The process of building polypeptides from amino acids is called
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translation
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Where is the attachment site for RNA polymerase?
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promoter region
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A particular triplet of bases in coding sequence of DNA is AGT. What is the corresponding anticodon on the tRNA that will bind to the mRNA codon?
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AGU
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There are 61 mRNA codons that specify an amino acid, but only 45 tRNA's. This is best explained by the fact that:
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Some tRNA's have anticodons that recognize two or more different codons
The rules for base pairing between the third base of a codon & tRNA are flexible |
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A new DNA strand elongates only in the 5' to 3' direction because...
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DNA polymerase can only add nucleotides to the 3' end
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Replicating the lagging strand of DNA (adding bases 3'-->5') utilizes
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DNA ligase
RNA primers Okazaki fragments |
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The original segment of DNA: T-A-C-T-T-C-A-A-A-C-C-G-A-T-T
What is the complementary mRNA sequence for the original DNA segment? |
A-U-G-A-A-G-U-U-U-G-G-C-U-A-A
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Sickle-cell disease is probably the result of which kind of mutation?
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Point
Missense |
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A frameshift mutation could result from
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either an insertion or a deletion of a base
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Which point mutation would be most likely to have a catastrophic effect on the functioning of a protein?
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A base deletion near the start of the gene
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Approximately waht proportion of the DNA in the human genome codes for proteins or functional RNA?
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2%
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If there are 20 chromatids in a cell, how many centromeres are there?
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10
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A cell containing 92 chromatids at metaphase of mitosis would, at completion, produce 2 nuclei containing how many chromosomes?
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46
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All of the following occur during prophase of mitosis in animal cells except
a. the centrioles move toward opposite poles b. the nucleolus can no longer be seen c. the nuclear envelope disappears d. chromosomes are duplicated e. the spindle is organized |
D. chromosomes are duplicated
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Two centromeres are arranged at opposite poles of the cell
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prometaphase
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Centrioles begin to move apart in animal cells
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prophase
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Chromosomes line up individually on the metaphase plate
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metaphase
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Centromeres uncouple, sister chromatids are seperated, and the 2 new chromosomes move to opposite poles of the cell
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anaphase
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The chromosomes unwind and return to chromatin and the nuclear envelope reforms
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telophase
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