18. Which of the following is not true?
(A) Viral envelopes are composed of lipids
(B) Viral envelopes are composed of proteins
(C) Viral envelopes are composed of carbohydrates
(D) Viral envelopes are composed of nucleic acids
(E) All of the choices are correct

14. Which of the following does not inhibit protein synthesis? (A) Tetracycline (B) Streptomycin (C) Penicillin (D) Erythromycin (E) Chloramphenicol

15. Which of the following is not true of coronaviruses? (A) Coronaviruses contain envelope (B) Coronaviruses are negative-sense single-stranded RNA viruses. (C) Coronaviruses infect humans (D) Coronaviruses infect mammals (E) Coronaviruses infect avian species

16. Which of the following is not true of coronavirus disease 2019 (COVID-19)? (A) COVID-19 is not pandemic disease (B) COVID-19 entry into human cells is mediated by a cell surface receptor angiotensin-converting enzyme (C) Patients infected with COVID-19 may cause cytokine storm in patients (D) COVID-19 may block interferon-stimulated genes expression (E) All of the choices are correct

17. Which is not true of coronavirus disease (COVID-19)? (A) COVID-19 is an infectious disease caused by the SARS-CoV-2 virus (B) Older people and those with underlying medical conditions like cardiovascular disease or diabetes are more likely to develop serious illness (C) Older people and those with underlying medical conditions like chronic respiratory disease or cancer are more likely to develop serious illness (D) Get vaccinated when it's your turn and follow local guidance (E) All of the choices are correct

19. The protein coat that encases viral genetic material is known as a (A) matrix (B) capsid (C) glycoprotein (D) lipid (E) All of the choices are correct

1. Which of the following is not a stop codon? (A) UGG (B) UGA (C) UAG (D) UAA

2. In eukaryotes, DNA replication occurs during (A) G1 phase (B) G2 phase (C) M phase (D) S phase

3. Which activity of DNA polymerase I is also called "proofreading" activity? (A) 5' to 3' polymerase activity (B) 3' to 5' polymerase activity (C) 5' to 3' exonuclease activity (D) 3' to 5' exonuclease activity

4. Which subunit of DNA polymerase III increases its processivity? (A) α subunit (B) γ complex (C) ε subunit (D) β subunit

5. Which of the following protein is not required for DNA replication in E. coli? (A) DNA helicase (B) Primase (C) DNA ligase (D) DNA glycosylase