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15 Cards in this Set
- Front
- Back
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Describe intermediate filaments
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-provide structural support, great tensile strength
-no motile functions |
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Describe microtubules
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-hollow protein filaments
-structural roles and motile functions -their molecular motors are involved in -chromosome movement during cell division -movements of cilia and flagella -some of the movements of organelles |
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Describe microfilaments
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-helical protein filaments
-structural roles and motile functions -their molecular motor proteins are involved in -skeletal muscle contraction -cell crawling -cleavage furrow formation -some of the movements of organelles |
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tight junctions
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serve as diffusion barriers
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desmosomes
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hold cells tightly together
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gap junctions
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communication junctions
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oxidation
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loss of H atoms (loss of e-)
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reduction
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gain of H atoms (gain e-)
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nucleotide is composed of _________, __________, & __________
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1) a nitrogenous base
2) a pentose 3) one or more phosphate groups |
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in vivo, DNA synthesis is________________
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semiconservative
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DNA is made by a _____________________ enzyme
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DNA polymerase
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All nucleic acid synthesis occurs in the ___ to ___ direction along the newly made strand.
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5' to 3'
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The two key functions of nucleic acids
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information storage and retrieval
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Transcription
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the synthesis of an RNA molecule using a DNA molecule as a template
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Enzyme that performs transcription
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RNA polymerase
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