Molecular Basis of Inheritance

Activity Chapter: 16-Molecular Basis of Inheritance 1、The Hershey Chase experiment determined that A) protein and DNA are the hereditary materials of viruses. B) protein, not DNA, is the hereditary material of viruses C) viruses do not contain hereditary material. D) DNA. not protein, is the hereditary material of viruses E) the blender is useful in the kitchen 2. The rules formulated by Erwin Chargaff state that C and G-1, in any molecule of DNA. A) A = T and G-C in any molecule of DNA. CJA-G and C = T in any molecule of DNA. E) DNA and RNA are made up of the same four nitrogenous bases. B) A D) A = U and G = C in any molecule of RNA A) cytosine, uracil, and thymine. D) cytosine and thymine. B) adenine and cytosine. E) adenine and guanine 3. Purines include C) adenine and thymine 4. The structure of DNA is characterized by a A) double helix and parallel strands. B) double helix and antiparallel strands. C) single helix. D) single helix and parallel strands. E) All of the above 5. Semiconservative replication of DNA involves A) each of the original strands acting as a template for a new strand. B) only one of the original strands acting as a template for a new strand C) the complete separation of the original strands, the synthesis of new strands, and the reassembly of double-stranded molecules D) the use of the original double-stranded molecule as a template, without unwinding. E) None of the above . The molecules that function to replicate DNA in the cell are A) DNA nucleoside triphosphates. D) DNAses. B) DNA polymerases. E) ribonucleases. C) nucleoside polymerases. During replication, the new DNA strand is synthesized A) in the 3′ to 5′ direction C) in both the 3′ to 5′ and 5′ to 3′ directions from the replication fork. D) from one end to the other, in the 3′ to 5′ or the 5′ to 3′ directions E) None of the above B) in the 5′ to 3′ direction. Double-stranded DNA looks a little like a ladder that has been twisted into a helix, or spiral. The side supports of the ladder are A) individual nitrogenous bases. B) alternating bases and sugars. C) alternating bases and phosphate groups. E) alternating bases, sugars, and phosphates. D) alternating sugars and phosphates. The leading strand and lagging strand in DNA replication differ in that only on the lagging strand A) DNA is replicated as short fragments. C) replication proceeds in the S’ to 3′ direction. D) DNA ligase is not needed. E) replication is slower. B) RNA primer is present In eukaryotic cells, each chromosome has A) one origin of replication. B) two origins of replication. C) many origins of replication D) only one origin of replication per nucleus. E) None of the above