Mutations within an organism can occur in body cells or reproductive cells. which type of mutation is seen in a sperm cell but not in a skin cell?

Which prevent errors in dna replication? a. helicase enzyme checks the dna for errors. b. each base can attach to only one other type of base. c. ribosome enzymes prevent errors from happening. d. dna contains no complementary base pairs.

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.

Dna and rna share a number of similarities, but they also differ in certain aspects of their structure. wich nitrogenous base is found in rna but is not found in dna