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__________ opens up one segment of the DNA helix during replication; __________adds complementary free nucleotides to the exposed DNA strand.


A) DNA ligase; DNA helicase
B) DNA helicase; DNA polymerase
C) DNA ligase; DNA polymerase
D) DNA helicase; DNA ligase
E) DNA polymerase; DNA ligase

F) C) and D)
G) D) and E)

Correct Answer

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After mitosis,each chromosome consists of two parallel filaments called sister chromatids.

A) True
B) False

Correct Answer

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Which of the following is not directly involved in translation?


A) DNA
B) mRNA
C) tRNA
D) rRNA
E) Ribosomes

F) C) and D)
G) A) and B)

Correct Answer

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Although all cells synthesize phospholipids,there are no genes for phospholipids.

A) True
B) False

Correct Answer

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