Ch. 16 The Molecular Basis of Inheritance Flashcards


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Campbell Biology 10th Edition
updated 8 years ago by theog10
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1

DNA replication

a molecule of DNA is copied

2

transformation

a change in genotype and phenotype due to the assimilation of external DNA by a cell

3

double helix

two strands and spacing of nitrogenous bases along them

4

antiparallel

two sugar-phosphate backbones, their subunits run in opposite directions

5

semiconservative model

Watson and Crick's model predicts that when a double helix replicates, each of the two daughter molecules will have one old strand, from the parental molecule, and one newly made strand.

6

origins of replication

short stretches of DNA having a specific sequence of nucleotides

7

replication fork

a Y-shaped region where the parental strands of DNA are being unwound

8

helicases

enzymes that untwist the double helix at the replication forks, separating the two parental strands and making them available as template strands

9

single-strand binding proteins

bind to the unpaired DNA strands, keeping them from re-pairing. The untwisting of the double helix causes tighter twisting and strain ahead of the replication fork.

10

topoisomerase

helps relieve this strain by breaking, swiveling, and rejoining DNA strands.