1. A biochemist extracts DNA from many different organisms for comparative analysis. Which of the following results is he likely
to obtain? Select all that apply.
A. A + T = G + C
B. A + G = T + C
C. A = T and G = C
D. A = G and T = C
E. A = C and G = T
2. A primer is laid down complementary to the DNA sequence TAGCAATCGCA to prime synthesis of a daughter strand. What will the sequence of the primer be?
A. ATCGTTAGCGT
B. ATGGTTAGGGT
C. AUCGUUAGCGU
D. AUCGTUAGCGT
3. What is the correct sequence action of proteins during the process of DNA replication?
A. DNA polymerase, helicase, primase, ligase, SSB
B. helicase, SSB, primase, ligase, DNA polymerase
C. ligase, helicase, SSB, primase, DNA polymerase
D. helicase, SSB, primase, DNA polymerase, ligase
4. When Griffith incubated heat-killed virulent S strain bacteria with live avirulent R strains, he found that R cells were transformed into lethal, disease-causing bacteria. What is the molecule responsible for the transformation of R cells into the S type? Why did the transformation occur?
A. Proteins in the heat-killed S cell extract; they were able to synthesize the capsular polysaccharide in the R cells and make them virulent.
B. The capsular polysaccharide in the heat-killed S cell extract; the polysaccharide was able to attach to R cells, thus making them virulent.
C. DNA in the heat-killed S cell extract; the DNA altered the genetic makeup of R cells, allowing them to synthesize the polysaccharide capsule, thus making them virulent.
D. Specialized lipids in the cell membrane of the S cells were able to integrate with the R cells, conferring the ability to evade host immunity.
5. Cells that have deregulated expression of telomerase can become cancerous. This can be attributable to what?
A. Telomerase can directly induce mutations in essential genes that can result in cancer.
B. Telomerase allows cells to replicate indefinitely without end-shortening issues.
C. Telomerase interferes with the function of repair enzyme complexes at the ends of the chromosome, causing DNA damages to persist.
D. Telomerase inhibits regulators of the cell cycle leading to cancer.
