Questions CNM 02_Introduction_3
chatbot
Here are 30 open-ended questions with detailed answers based strictly on your uploaded PDF 02_Introduction_3.pdf, which introduces fundamental chemical and physical principles of molecular and cellular biology.
🧠 30 Questions & Answers – Based on 02_Introduction_3.pdf
1.
Why must cells obey the laws of physics and chemistry?
Answer: Because they are composed of molecules and atoms, their organization and function are governed by thermodynamics, kinetics, and physical forces like electrostatics and hydrophobic interactions.
2.
What is the primary solvent in biological systems and why is it important?
Answer: Water. It is essential because it dissolves ions and polar molecules, participates in chemical reactions, and drives the hydrophobic effect that influences molecular assembly and membrane formation.
3.
What is a covalent bond and what role does it play in biomolecules?
Answer: A covalent bond is formed by the sharing of electron pairs between atoms. It provides the stable backbone of molecules like DNA, proteins, and carbohydrates.
4.
List four types of non-covalent interactions.
Answer: Ionic bonds, hydrogen bonds, van der Waals interactions, and hydrophobic interactions.
5.
Why are non-covalent bonds crucial despite being weak individually?
Answer: Their cumulative strength provides molecular specificity and dynamic stability in processes like enzyme-substrate binding and protein folding.
6.
What drives hydrophobic interactions in aqueous environments?
Answer: The entropy-driven exclusion of nonpolar molecules from water, which leads them to aggregate and reduce disruption of water’s hydrogen-bonding network.
7.
What are the monomeric building blocks of proteins?
Answer: Amino acids.
8.
What kind of bond links amino acids in a protein?
Answer: Peptide bonds.
9.
What determines a protein’s three-dimensional structure?
Answer: The sequence of amino acids, which dictates folding via intramolecular interactions.
10.
List three functional roles of proteins in cells.
Answer: Enzymatic catalysis, signal transduction (e.g., receptors), and structural support (e.g., cytoskeleton).
11.
What are nucleotides made of?
Answer: A nitrogenous base, a sugar (ribose or deoxyribose), and one or more phosphate groups.
12.
How are nucleotides linked together in DNA and RNA?
Answer: By phosphodiester bonds between the 3′ hydroxyl of one sugar and the 5′ phosphate of the next.
13.
What is the function of DNA in cells?
Answer: To store and transmit genetic information across generations.
14.
What is the major structural difference between DNA and RNA?
Answer: DNA is double-stranded and uses deoxyribose and thymine; RNA is single-stranded and uses ribose and uracil.
15.
Name two types of functional (non-coding) RNAs.
Answer: rRNA (ribosomal RNA) and tRNA (transfer RNA).
16.
What are the monomers of carbohydrates?
Answer: Monosaccharides (e.g., glucose, galactose).
17.
What kind of bond links sugars in polysaccharides?
Answer: Glycosidic bonds.
18.
What is the function of glycogen in cells?
Answer: Energy storage in animal cells.
19.
What roles do carbohydrates play at the cell surface?
Answer: Cell-cell recognition and signaling (e.g., glycoproteins, glycolipids).
20.
What are lipids and what key property do they share?
Answer: Lipids are a diverse group of hydrophobic or amphipathic molecules. Their shared property is insolubility in water.
21.
What lipids are key components of biological membranes?
Answer: Phospholipids, which have a hydrophilic head and hydrophobic tails.
22.
What is molecular complementarity and why is it important?
Answer: It refers to the precise fit between molecules in terms of shape, charge, and bonding potential; it is critical for specificity in molecular recognition.
23.
What determines binding affinity between two molecules?
Answer: The number and strength of non-covalent interactions (hydrogen bonds, electrostatics, van der Waals forces, etc.).
24.
Is high binding affinity always the same as high specificity?
Answer: No. A molecule can bind tightly (high affinity) to multiple targets (low specificity).
25.
What determines whether a chemical reaction is spontaneous?
Answer: The change in Gibbs free energy (ΔG); the reaction is spontaneous if ΔG < 0.
26.
What is activation energy and how does it relate to enzymes?
Answer: It is the energy barrier that must be overcome for a reaction to proceed. Enzymes lower this barrier to speed up reactions.
27.
Do enzymes alter the free energy of a reaction?
Answer: No. Enzymes change the rate (kinetics), not the ΔG (thermodynamics).
28.
Why is ATP important in cellular reactions?
Answer: ATP hydrolysis releases energy that can be used to drive non-spontaneous reactions (e.g., biosynthesis, active transport).
29.
What is templated polymerization and where is it used?
Answer: A process by which a polymer is synthesized by copying the sequence of a pre-existing template. It occurs in DNA replication, transcription, and translation.
30.
How does base-pairing ensure fidelity in information transfer?
Answer: Specific hydrogen bonds between complementary bases (A-T/U, G-C) allow precise copying of genetic information.
Let me know if you’d like this turned into a printable study guide, flashcards, or quiz format.
see also
Tags: neurobiology science
Superlink: 051 ☣Neurobiology 050 🧠Neuroscience
Source
Created: 2025-06-11 14:43