29. Which following one is an essential amino acid for human cells?
(A) proline
(B) cysteine
(C) serine
(D) glycine
(E) phenylalanine.

25. In Michaelis-Menten kinetics, what assumption is made about the enzyme-substrate complex during the steady-state phase of the reaction? (A) The concentration of the enzyme-substrate complex is constant. (B) The enzyme is saturated with substrate. (C) Product concentration remains constant. (D) The product is formed as soon as the substrate binds to the enzyme. (E) The enzyme binds to substrate irreversibly.

26. Which following statement is correct in human cells? (A) Catabolism is usually an endergonic reaction in human cells. (B) Most metabolisms follow the thermodynamic laws, but few do not follow the first law of thermodynamics because human beings need to eat every day. (C) Anabolism often comes along with ATP generation in human cells. (D) The Complex III in the oxidative phosphorylation is not a proton pump. (E) Cytochrome C is a proton carrier that delivers the proton to Complex IV in oxidative phosphorylation.

27. What is the amino acid residue in glycogenin able to form a covalent bond with a glucose residue in the glycogen complexes? (A) serine (B) asparagine (C) tyrosine (D) glutamine (E) threonine.

28. Which following enzyme can generate 5'-AMP? (A) phosphodiesterase (B) adenylyl kinase (C) phosphorylase (D) protein phosphatase-1 (E) heme oxygenase.

30. What type of cells is responsible for heme catabolism in the human liver? (A) Kupffer cells (B) Reticuloendothelial cells (C) Stellate macrophages (D) Hepatic stellate cells (E) Hepatocytes.

31. Which term below describes the RNA synthesis process using the DNA template? (A) Translation (B) Transcription (C) Replication (D) Splicing (E) Elongation

32. Which subunit described below is not a component of E. coli RNA polymerase? (A) α (B) β (C) ω (D) σ (E) ε

33. Which below class of RNA encodes protein? (A) mRNA (B) rRNA (C) tRNA (D) snRNA (E) siRNA

34. Which RNA processing can protect RNA from a 3' -＞ 5' exonuclease attack? (A) Splicing (B) 5' capping (C) 3' polyadenylation (D) Termination (E) Phosphorylation

35. Which below rRNA is not from RNA processing of pre-rRNA transcript (45S rRNA)? (A) 5.8S rRNA (B) 5S rRNA (C) 18S rRNA (D) 28S rRNA (E) None of the above all