Tuesday, July 28, 2009

Desperately need help these bio question?

76) During DNA replication, 76) ______


A) methylated DNA is copied in the cytoplasm, and unmethylated DNA in the nucleus.


B) all methylation of the DNA is lost.


C) methylation of the DNA is maintained because methylation enzymes act at DNA sites where one strand is already methylated and thus correctly methylates daughter strands after replication.


D) DNA polymerase is blocked by methyl groups, and methylated regions of the genome are therefore left uncopied.


E) methylation of the DNA is maintained because DNA polymerase directly incorporates methylated nucleotides into the new strand opposite any methylated nucleotides in the template





97) Which of the following statements is (are) true? 97) ______


A) The closer two genes are on a chromosome, the higher the probability that a crossover will occur between them.


B) The observed frequency of recombination of two genes that are far apart from each other has a maximum value of 50%.


C) Two of the traits that Mendel studiedhorizontalseed color and flower colorhorizontalare linked on the same chromosome.


D) Only B and C are correct.


E) A, B, and C are correct.

Desperately need help these bio question?
76) C


97) C


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