Bio Sci 93 Exam 2 |Verified Exam Questions| 100% Correct

Bio Sci 93 Exam 2 |Verified Exam Questions| 100% Correct A biochemist isolates, purifies, and combines in a test tube a variety of molecules needed for DNA replication. When she adds some DNA to the mixture, replication occurs, but each DNA molecule consists of a normal strand paired with numerous segments of DNA a few hundred nucleotides long. What has she probably left out of the mixture? a) DNA polymerase b) DNA ligase c) Okazaki fragments d) primate *Ans*b Catabolism is to anabolism as ___________________ is to ___________________. a.) exergonic; spontaneous b.) exergonic; endergonic c.) free energy; entropy d.) work; energy *Ans*b How is photosynthesis similar in C4 plants and CAM plants? a) In both cases, only Photosystem I is used b) Both types of plants make sugar without the Calvin Cycle c) In both cases, rubisco is not used to fix carbon initially d) Both types of plants make most of their sugar in the dark *Ans*c If an enzyme in solution is saturated with substrate, the most effective way to obtain a faster yield of products is to a) add more of the enzyme. b) heat the solution to 90 degrees C. c) Add more substrate. d) Add a noncompetitive inhibitor. *Ans*a In a nucleosome, the DNA is wrapped around a) histones b) ribosomes c) polymerase molecules d) a thymine dimer *Ans*a In analyzing the number of different bases in a DNA sample, which result would be consistent with the base-pairing rules? a) A = G b) A + G = C + T c) A + T = G + C d) A = C *Ans*b In eukaryotic cells, transcription cannot begin until a) the two DNA strands have completely separated and exposed the promoter b) several transcription factors have bound to the promoter c) the 5' caps are removed from the mRNA d) the DNA introns are removed from the template *Ans*b In his work with pneumonia-causing bacteria and mice, Griffith found that a) the protein coat from pathogenic cells was able to transform nonpathogenic cells. b) heat-killed pathogenic cells caused pneumonia c) some substance from pathogenic cells was transferred to non-pathogenic cells, making them pathogenic d) the polysaccharide coat of bacteria caused pneumonia *Ans*c In Mechanism, photophosphorylation is most similar to a) substrate-level photophosphorylation in glycolysis b) oxidative phosphorylation in cellular respiration c) carbon fixation d) regeneration of the CO2 acceptor *Ans*b In Mitochondria, exergonic redox reactions a) are the source of energy driving prokaryotic ATP synthesis. b) provide the energy that establishes the proton gradient c) reduce carbon atoms to CO2 d) are coupled via phosphorylated intermediates to endergonic processes *Ans*b