18. G-protein-coupled receptors are characterized by:
(A) One transmembrane domain
(B) Seven transmembrane helices
(C) Intrinsic kinase activity
(D) Direct binding to DNA

19. Tight junctions primarily function to: (A) Anchor cells to the extracellular matrix (B) Allow direct cytoplasmic communication (C) Prevent leakage between epithelial cells (D) Provide mechanical strength

20. Stem cells are defined by their ability to: (A) Divide rapidly (B) Differentiate only once (C) Self-renew and differentiate into specialized cell types (D) Form tumors

1. Which feature best distinguishes a facilitated diffusion transporter from apassive ion channel? (A) Requirement for ATP hydrolysis. (B) Ability to transport solutes against their concentration gradient. (C) Saturable transport kinetics. (D) Dependence on membrane potential. (E) Coupling to a secondary ion gradient.

2. COPII vesicles are primarily responsible for protein transport: (A) From Golgi to ER. (B) From trans-Golgi to lysosomes. (C) Between Golgi cisternae. (D) From plasma membrane to early endosomes. (E) From ER to Golgi.

3. In bacteria, single polycistronic mRNA encodes for (A) a single enzyme although there are many in the metabolic pathway. (B) multiple enzymes of the particular pathway. (C) a single mRNA which is split into multiple mRNAs before translation. (D) a single peptide with multiple catabolic sites. (E) None of the above.

4. Together with ______ .______ provide(s) for genetic variability within species and, ultimately, the evolution of new species. (A) DNA repair; DNA glycosylase (B) DNA glycosylase; recombination (C) recombination; mutations (D) mutations; DNA glycosylase (E) DNA repair; mutations

5. The base in DNA that specifies the first base in the RNA transcript is called a(n)______ and is unmbered ______ .(A) promoter; -5 (B) enhancer; -35 (C) transcription start site; 0 (D) transcription start site; +1 (E) promoter complex; +5

6. Which of the following correctly pairs a cytoskeletal filament with its primary monomeric or dimeric subunit? (A) Microtubule - Actin. (B) Microfilament -Actin. (C) Microfilament - keratin or lamin. (D) Microfilament - aß-tubulin dimer. (E) Intermediate filament -- aß-tubulin dimer.

7. What is the role of cytochrome c release during intrinsic apoptosis? (A) It binds directly to pro-caspase-3, causing its activation. (B) It neutralizes IAP proteins like XIAP, freeing caspases from inhibition. (C) It released proteases from the mitochondria to cleave protein targets. (D) It permeabilizes the mitochondrial inner membrane, causing a loss of ATP production. (E) It triggers the formation of the apoptosome with APAF-1, which then activates caspase-9.

8.What is the primary mechanism of the MTT assay for assessing cell viability? (A) Detecting membrane permeability with MTT dye. (B) Measuring ATP levels within the cell population. (C) Labeling newly synthesized DNA with a thymidine analog. (D) Quantifying proteolytic fragments in response to MTT treatment. (E) Reducing the MTT dye into insoluble purple formazan in the mitochondria of living cells.

115年 - [無官方正解]115 國立臺灣大學_ 碩士班招生考試試題：分子與細胞生物學#137644

114年 - [非官方正解]114 國立臺灣大學_碩士班招生考試試題：分子與細胞生物學#125981

110年 - 110 國立臺灣大學_碩士班招生考系所_生命科學研究所:分子與細胞生物學#101296