Flashcards
Molc Bio Exam 1 Flashcards
Flashcards do conjunto (30)
- 1How many pairs of shared electrons form a single covalent bond?One
- 2How many pairs of shared electrons form a double covalent bond?Two
- 3What type of covalent bond holds water molecules together?Polar
- 4What type of bond holds the two strands of DNA together?Hydrogen bonds
- 5What type of bond is NaCl?Ionic
- 6What is a hydrogen bond? Name an example.A hydrogen bond is an interaction between polar groups due to unequal charges across the molecule.
Examples: between water molecules;
bases in DNA or RNA strand. - 7What is a Van der Waals interaction? Name an example.A brief fluctuation in charges across a membrane.
Example: seen in all molecules
Between two oxygen molecules - 8What is a peptide bond? Give an example.It is a covalent bond.
It bonds amino acids together to form proteins. - 9What are the three types of carbohydrates?Monosaccharides,
Disaccharides,
Polysaccharides - 10What does the first law of thermodynamics state?Energy cannot be created or destroyed.
- 11Does the entropy increase or decrease? A glass of milk falling into a fish tank causing the water to become milky white.Increases
- 12Does the entropy increase or decrease? A fire burns in the fireplace turning the log into a pile of ash.Increases
- 13Does the entropy increase or decrease? A fertilized egg divides into a thousand cells to form an embryo.decreases
- 14Does the entropy increase or decrease? A protein is assembled from individual amino acids by a ribosome.decreases
- 15What is Gibbs Free Energy?It is the energy available to do useful work.
- 16What is the Gibbs Free Energy equation?
- 17What happens to ΔG when ΔH rises?ΔG value increases
- 18What happens to ΔG when S gets smaller?ΔG value increases
- 19For a non spontaneous rxn that demonstrates a positive change in both entropy and enthalpy, what can easily be done in a laboratory to make the rxn spontaneous?Increase the temperature of the rxn
- 20Describe equilibrium.Equilibrium is the point where the rate of the forward rxn is exactly the same as the rate of the reverse rxn.
- 21What is the name of the energy-carrying intermediary that cells use to obtain the energy from food molecules?ATP: Adenosine Triphosphate
- 22What is activation energy?It is the amount of energy needed to get the reactants to the transition state.
- 23In chemical reactions, what is the transition state?It is the point at which bonds in the reactant are broken to form new bonds, also known as the product.
- 24What is a catalyst?It is any substance that lowers the activation energy of a reaction, thus speeding up the reaction.
- 25What is an enzyme?Any molecule, usually a protein, that can catalyze a chemical reaction.
- 26What are substrates?They are the reactants on which an enzyme acts.
- 27What are active sites on an enzyme?They are the sites on the enzyme where substrates bind and react.
- 28What is the lock-and-key model?A model where the enzyme is a rigid lock and the substrates are the keys that fit into the lock.
- 29What is the induced fit model?A model where the enzyme changes shape when the substrate binds to the active site.
- 30—
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- Bachelors Molecular Cell Biology (Exam 1) FlashCards sobre Molc Bio Exam 1 Flashcards, criado por lsmith181 em 20-01-2016.
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