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• 20. Where would you expect to find tight junctions? (A) in the epithelium of an animal's intest
• 21. Cell membranes are asymmetrical. Which of the following statements are the most likely explanati
• 23. The part of an enveloped virus that consists of the nucleic acid and genome and the surrounding
• 22.Which of the following cell types have extensive area of endoplasmic reticulum? (A) Neurons that
• 24. An outer surface of viral envelopes is covered with glycoprotein spikes that function as (A) bin
• 23. Which of the following factor do not affect the resolution of a light microscope? (A) wavelength
• 24. Which of the following technique is used for preparing microsomes (A) sodium dodecyl sulfate-pol
• 25. Correlative light-electron microscopy is a technique? (A) with samples that labeled with gold pa
• 2. Which statement is correct? (A) Histone proteins are mainly positively charged. (B) The core hist
• 3. Which of the following protein is not required for DNA replication in E. coli? (A) DNA helicase (
• 4. Which of the following is a true statement regarding DNA polymerase? (A) It is a processive enzym
• 5. Which activity of DNA polymerase I is also called \"proofreading\" activity? (A) 5�
• 6. Which subunit of DNA polymerase III increases its processivity?(A) α subunit (B)γ complex(C)ε sub
• 7. During DNA Replication, a short segment of RNA must form before DNA synthesis can begin. This is
• 8. Amino acids are the building blocks of: (A) DNA and RNA (B) lipids (C) proteins(D) carbobydrates
• 9. Which description is false? (A) X-rays are hazardous because they cause DNA double-strand breaks,
• 10. Which of the following molecules is involved in DNA nucleotide excision repair? (A) RecBCD (B) M
• 11. Which of the following molecules is involved in DNA mismatch repair? (A) RecBCD (B) MutH (C) Uvr
• 12. Which of the following molecules is involved in non-homologous end-joining? (A) RecBCD (B) Ku70
• 13. If a species contains 32% adenine ( A ) in its DNA, what percentage of guanine (G) would it also
• 14. Which of the following is not in the pre-replicative complexes (pre-RCs)? (A) ORC (B) Rad51 (C)
• 15. The unique enzyme that retrotransposons encode and does not exist in human cells is (A) DNA poly
• 16. Which of the following subunit does not belong to the core enzyme of prokaryotic RNA polymerase?
• 17.5S rRNA is transcribed by: (A) Reverse transcriptase (B) RNA polymerase III (C) RNA polymerase II
• 18. Following the previous question, miRNA(micro RNA) is transcribed by? (A) RNA polymerase I (B) RN