Part one multiple choice. Put the letter of the best answer to the left of each
ID: 195264 • Letter: P
Question
Part one multiple choice. Put the letter of the best answer to the left of each item. (2 points each) 1. Hershey and Chase took advantage of which feature of DNA vs proteins to deduce that DNA was the genetic material in the bacteriophage they studied? A. DNA is double stranded, proteins are single stranded B: "DAthassutturas partOTTSTTIOteetter composition protein C. DNA has four nitrogenous bases, proteins 20 nitrogen bases D. DNA has phosphorus as part of its molecular composition, proteins have sulftur. 2. The DNA of particular gene in a human chromosome has a nitrogen base composition that is 20% guanine. The percentage of adenine is which one of the following? A. 10% B.40% 30% D. 80% (c 3. Garrod's hypothesis about the relationship of enzymes and disease was that hereditary metabolic diseases result from: inherited defects in the chemical intermediates of metabolism. inherited defects in an enzyme. A. 4. When double stranded (Duplex) DNA replicates, what happens to the two original (parental) DNA strands? A. Both end up together in one of the daughter DNA molecules B. One serves as the template strand for making both daughter DNA molecules, the other strand is broken down. Both strands are still present, one in each of the two daughter DNA molecules D. The strands are both braken apart and neither is present in the daughter DNAExplanation / Answer
1. Option D is correct. DNA is composed of nitrogenous bases, sugar and phosphates. Thus it contain phosphorus and some proteins have sulfur containing amino acids.
2. Option C is correct. According to Charagaff's rule A + G = T + C and G = C, T = A. Here guanine is 20% it means cytosine will be 20%. Rest 60% will be adenine and thymine. Since, adenine = thymine, therefore adenine will be 30% and thymine will be 30%.
3. Option B is correct. Garrod established the relation between genetic and biochemistry.
4. Option C is correct. During DNA replication each strand of a double stranded DNA act as a template strnad on which a new complimentry strnd is formed.
5. Option B is the corrct answer. Here in the presence of W with minimal grow medium, the mutant is not growing. It means W is not converting into X and thus the enzyme responsible for converting W into X is defective.
6. Option C is the correct answer.
7. Option B is correct. The synthesized RNA is complimentry to the temlate strand and synthesise in the direction of 5' to 3'. In RNA uracil is present at the place of thymine in DNA.
8. Option B is correct. The four gametes will be AB, Ab, aB, ab.