Biology Final Exam 2023 with 100% correct answers

What was the key finding from Griffith's experimants using live and heat-killed pathogenic bacteria? - correct answer -Genetic material can be transferred from dead to live bacteria. Which of the following is not a component of DNA? - correct answer -The pyrimidine uracile Chargaff studied the composition of DNA from different sources and found that - correct answer -the proportions of A equal that of T and G equals C. The bonds that hold two complementary strands of DNA together are - correct answer -hydrogen bonds. The basic mechanism of DNA replication is semi conservative with two new molecules - correct answer -each with a mixture of old and new strands One common feature of all DNA polymerases is that they - correct answer -synthesize DNA in the 5' to 3' direction Which of the following is NOT part of the Watson-Crick model of the structure of DNA? - correct answer -the two DNA strands are oriented in parallel (5' to 3'). If one strand of DNA is: 5' ATCGTTAAGCGAGTCA 3', then the complementary strand would be: - correct answer -5' TGACTCGCTTAACGAT 3' Hershey and CHase used radioactive phosphorus and sulfur to - correct answer -differentially label DNA and protein. The Meselson and Stahl experiment used density label to be able to - correct answer -distinguish between newly replicated and old strands. The difference in leading- versus lagging-strand synthesis is a consequence of - correct answer -both the physical structure of DNA and the action of polymerase enzyme. If the activity of DNA ligase was removed from replication, this would have a greater affect on - correct answer -s