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14 Cards in this Set
- Front
- Back
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What are polyribosomes? |
Several ribosomes translating the same mRNA |
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Silent mutation? Missense mutation? nonsense mutation? |
Does not change amino acid; changes the entire amino acid; creates a stop codon |
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What is a frameshift mutation? |
when an insertion or deletion causes extensive missense mutations |
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What are the 3 external signals in cell cycle regulation? |
Growth factors, anchorage dependence, density dependent inhibition |
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What is a karyotype? |
Ordered arrangement of chromosome pairs |
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In crossing over, what are the X shaped regions referred to? |
Chiasmata |
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What are the three reasons for genetic variation? |
Independent assortment, crossing over, random fertilization |
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What type of model is used for DNA replication? |
Semiconservative model |
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Who is the first enzyme proofreading and repairing DNA? |
DNA Pols |
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What is mismatch repair with DNA |
When DNA pols miss something, enzymes will come in and fix the problems |
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When there is a damage to DNA, what happens? |
Nucleotide excision repair |
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Difference between telomeres and telomerase? |
Telomeres are non coding sequences on the end of duplicated DNA strands; telomerase catalyzes the length in germ cells |
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What are histones? |
Proteins that help pack DNA into chromosomes |
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What are Chargaff's rules? |
1) The base composition of DNA varies between species 2) For each species, A and T are equal and C and G are equal. |
