Cell Biology & Metabolism: Descriptive Questions (1-32)

Describe the most important differences between eukaryotic and prokaryotic cells from the three perspectives of the nucleus, organelles, and ribosomes.

Describe the 'fluid mosaic model,' which is the basic structure of the cell membrane, including its components and characteristics.

Protein structure has a hierarchy from primary to quaternary structure. Explain what determines each of these structural levels.

Explain the difference between active and passive transport from the perspectives of the concentration gradient and the requirement for energy (ATP).

Explain how the rate of an enzyme reaction changes at low, optimal, and high temperatures, including the reasons for these changes.

When the amount of enzyme is constant, how does the reaction rate change as the substrate concentration is increased from low to high? Explain the reason using the term 'active site.'

What is 'competitive inhibition' in an enzyme reaction? Explain by focusing on the structure of the inhibitor and where it binds.

Regarding the role of the electron transport chain in cellular respiration, explain three points: where it takes place, the final electron acceptor, and the mechanism by which ATP is generated.

Describe the three main stages of the Calvin-Benson cycle, and state what is consumed and what is produced in the cycle as a whole.

Explain why the C₄ pathway is advantageous compared to the C₃ pathway, especially in hot, dry environments, mentioning the initial CO₂-fixing enzyme and photorespiration.

Describe the mechanism of photosynthesis in CAM plants, focusing on how they conserve water. Also, state the difference in their activities between day and night.

Compare C₃, C₄, and CAM plants on two points: (1) the initial CO₂-fixing enzyme, and (2) the environmental conditions under which each is most advantageous.

The eukaryotic cell cycle is broadly divided into M phase and interphase. State that interphase is further divided into three phases, and describe the main events that occur in each. Also, name the two main groups of proteins that regulate the progression of the cell cycle.

Explain the differences between apoptosis and necrosis from the perspectives of the morphological changes that occur in the cell and the effects on the living organism.

Explain why DNA replication is called 'semiconservative replication.' Also, describe the difference in the synthesis patterns of the leading and lagging strands in relation to the function of DNA polymerase.

Describe the processes of 'transcription' and 'translation' in the central dogma, from the perspectives of where they occur, the template molecule, the molecule synthesized, and the main machinery or enzymes involved.

Regarding the lactose operon (lac operon), a representative example of gene expression regulation in prokaryotes, explain how gene expression is regulated in the absence and presence of lactose.

Name the three main types of fibers that make up the cytoskeleton, and for each, describe its main protein component and two of its main functions within the cell.

Describe the general process of information transmission, from the binding of an extracellular signal molecule (ligand) to a receptor to the final response within the cell, by dividing it into the three stages of 'reception,' 'transduction,' and 'response.' Also, state the role of a 'second messenger' with a specific example.

List three characteristics of cancer cells that are different from normal cells. Also, explain how 'oncogenes' and 'tumor suppressor genes' are involved in carcinogenesis from the perspective of the effects of their mutations.

Describe the pathway (secretory pathway) by which a protein synthesized in the endoplasmic reticulum is transported through the Golgi apparatus and secreted outside the cell. Mention how the protein is transported by vesicles in this process.

Name the three main types of cell-cell adhesion junctions in animal tissues and describe the structure and main function of each.

Explain the differences that meiosis brings about in the chromosome number and genetic composition of daughter cells compared to mitosis. Also, name the two main mechanisms by which genetic diversity is generated during meiosis.

Regarding the initial stages of aerobic respiration, glycolysis and the citric acid cycle, state where in the cell each takes place, what the main starting material and final products are. Also, explain the main purpose of these processes.

Define the two fundamental abilities of stem cells. Also, explain the mechanism by which 'cell differentiation' occurs, from the perspective of gene expression.

After describing the structure of a nucleotide, the basic unit of DNA and RNA, explain the structural differences between DNA and RNA from the two perspectives of 'sugar' and 'base.'

Among the characteristics of the genetic code (codons), explain what the properties of 'universality' and 'degeneracy (redundancy)' are.

What is Mendel's 'Law of Segregation'? Explain using the terms allele, gamete, and genotype.

What is Mendel's 'Law of Independent Assortment'? Explain using an example of two pairs of alleles located on different homologous chromosomes.

Regarding mutations that occur in the base sequence of a gene, describe what 'point mutations' and 'frameshift mutations' are, and state the difference in their effects on protein function.

Broadly classify chromosomal abnormalities into 'structural abnormalities' and 'numerical abnormalities,' and explain what each type of abnormality is. Also, state which chromosome is affected and what kind of abnormality occurs to cause Down syndrome.

Explain what 'epigenetics' is. Also, describe how its representative molecular mechanisms, 'DNA methylation' and 'histone modification,' regulate gene expression.