what is the point at which a dna strand is unzipped so that it can form new complimentary strands?
polymerase
nuclease
replication fork
double helix 2 points save answer question 3
which of these is not a function of dna polymerase?
adding base pairs
correcting errors
unwinding the helix
replicating the dna strand 2 points save answer question 4
the molecules of dna produced in replication are
identical
complementary
mutated
connected 2 points save answer question 5
how do cells correct errors in dna that would disrupt their function?
enzymes use the surrounding sections of the dna to determine the correct structure; then they repair the errors by replacing atoms in the existing molecule.
enzymes cut out the erroneous part and then use the complementary dna on the intact strand to add the correct nucleotides.
enzymes use rna that was made before the damage occurred to make a new double strand of dna to insert into the molecule.
the erroneous part has weaker bonds to the dna molecule, so it falls off, and the proper nucleotides are attracted to the gap to repair the damage.
predictions and planning happen before. a summery comes after. errors you get after investigation and new questions propose what you can look for in the future.
Answer from: Quest
each of the 46 original chromosomes splits into two daughter chromosomes, so there are two sets of 46 daughter chromosomes that end up in each cell. human cells have 46 chromosomes. each chromosome consists of a pair of identical chromatids attached together by a structure called a centromere.
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