Chem 154 - Study guides, Class notes & Summaries

Which of the following reactions is commonly used to replenish intermediates of the citric acid cycle? correct answer: glutamate --> ketoglutarate Which of the following statements is true regarding the activity of the ribonuceltide reductase? correct answer: The enzyme is required to convert nucleotides from the ribose form to the deoxyribose form required for DNA synthesis A Southern blot with a probe (denoted as XXXX in the figure) to DNA isolated from an individual who has both a ...

QUANTUM MECHANICS - The theory explaining why energies and angular momenta of atoms and molecules are quantized VALENCE ELECTRON (SPECIAL FACT) - Valence electrons are involved in the formation of bonds and core electrons are not involved in chemical bonding. ATOMIC RADIUS - - Calculated by measuring the internuclear distance and dividing by 2. - More electrons mean a larger radius. CATIONIC RADII - Cation will always be smaller than neutral species. ANIONIC RADII - Anion is larger ...

Explain, in detail, the amplification and cloning process for expression of vector - 1. Purify the plasmid and amplify your WT gene with PCR 2. Perform a site-directed mutagenesis a. pair mutagenic primers with WT primers b. Purify products from PCR, and perform a second PCR with the WT primers 3. Clone amplified WT and mutant gene of interest into an expression vector a. cut product with correct restriction enzymes b. Purify c. Ligate expression vector with WT and mut...

Aromatic Compounds - the class of compounds that contain six-membered benzene-like rings with three double bonds 120 degrees; sp2 - benzene is a planar molecule with the shape of a regular hexagon. All C-C-C bond angles are______, all six carbon atoms are _____-hybridized, and each carbon has a p-orbital perpendicular to the plane of the six-membered ring. Toluene - Name this: Benzoic Acid - Name this: Phenol - Name this: Aniline - Name this: Benzaldehyde - Name this: Ortho ...

core electrons - The electrons that are not in the outermost shell of an atom valence electrons - Electrons on the outermost shell, which for chemical bonds cation size - Smaller than neutral atom due to less electrons which are pulled closer by the nucleus anion size - larger than neutral atom isoelectronic - same number of electrons, the more negative a species is, the greater its size Effective nuclear charge (Zeff) - the actual nuclear charge experienced by an electron, atoms ...

NFPA 10 Exam 127 Questions with Verified Answers NFPA 10 - CORRECT ANSWER Standard for Portable Fire Extinguishers NFPA 17 - CORRECT ANSWER Standard for Dry Chemical Extinguishing Systems NFPA 17a - CORRECT ANSWER Standard for Wet Chemical Extinguishing Systems Portable fire extinguishers - CORRECT ANSWER The first line of defense to cope with fires of limited size Authority Having Jurisdiction (AHJ) - CORRECT ANSWER An organization, office, or individual responsible for enforcing...

1. For lower premolars, the purpose of inclining the handpiece lingually is to, A. Avoid buccal pulp horn B. Avoid lingual pulp horn C. Remove unsupported enamel D. Conserve lingual dentine - ANSWER A. Avoid buccal pulp horn Explanation 1- avoid BUCCAL pulp horn 2- conserve ling. dentine So take A and B if available 2. For an amalgam restoration of a weakened cusp you should, A. reduce cusp by 2mm on a flat base for more resistance B. reduce cusp by 2mm following the outli...

Period - Elements in a Row Group - Elements in a Column Equation for calculating the energy of one electron species. - E = -2.178x10⁻¹⁸J x Z² x (1/n2) where Z is the atomic number of the element Two equations for calculating energy provided by light - E(light) = hc/λ or E(light) = hƒ Isovalent - Species that have the same number of valence electrons. Valence electrons - The number of electrons in the s and p subshells of the occupied electronic shell Electronic configu...

NFPA 10 Exam 127 Questions with Verified Answers NFPA 10 - CORRECT ANSWER Standard for Portable Fire Extinguishers NFPA 17 - CORRECT ANSWER Standard for Dry Chemical Extinguishing Systems NFPA 17a - CORRECT ANSWER Standard for Wet Chemical Extinguishing Systems Portable fire extinguishers - CORRECT ANSWER The first line of defense to cope with fires of limited size Authority Having Jurisdiction (AHJ) - CORRECT ANSWER An organization, office, or individual responsible for enforcing...

1. The efficiency of the refrigerant cycle is affected by the operation of the condenser. of the following, a more efficient centrifugal compressor operation results from Answer: Lowering the condensing pressure 2. The heat removed from the refrigerant in a condenser is Answer: Sensible and Latent Heat 3. The refrigerant unit that you have been assigned to is being taken out of service for a major repair. You have been assigned to withdraw refrigerant for storage in suitable containers. Accord...