I have an experience of more than 2 years in teaching Chemistry and Biology
One brand of laundry bleach is an aqueous solution containing4.55% sodium hypochlorite (NaOCl) by mass. What is themolarity of this solution? (Assume a density of 1.02 g>mL.)
A solution contains 10.05 g of unknown compound dissolved in 50.0 $\mathrm{mL}$ .of water. (Assume a density of 1.00 g/mL. for water.) The freezing pointof the solution is $-3.16^{\circ} \mathrm{C}$ . The mass percent composition of thecompound is $60.97 \% \mathrm{C}, 11.9446 \mathrm{H},$ and the rest is O.What is the molecular formula of the compound?
Challenge What conversion factors are needed to convert:a. nanometers to meters?b. density given in $\mathrm{g} / \mathrm{cm}^{3}$ to a value in $\mathrm{kg} / \mathrm{m}^{3}$ ?
Rubidium has two naturally occurring isotopes, rubidium-85 (atomic mass $=84.9118$ amu; abundance $=72.15 \%$ ) and rubidium-87 (atomic mass = 86.9092 amu; abundance = 27.85$\%$ ). Calculate the atomic weight of rubidium.
The Goodyear blimps, which frequently fly over sporting events, hold approximately $175,000 \mathrm{ft}^{3}$ of helium. If the gas is at $23^{\circ} \mathrm{C}$ and 1.0 atm, what mass of helium is in a blimp?
Calculate the following values associated with light and the electromagnetic spectrum:a. Calculate the energy of a photon of electromagnetic radiation whose frequency is 6.75 x 1012 sec-1. b. Calculate the energy of a photon of radiation whose wavelength is 322 nm. c. What wavelength of radiation has photons of energy 2.87 x 10-18 J?
a cell's proteome describesa. the number of genes in the cellb. the entire genome of the cellc. the amount of mRNA produced by the celld. all of the proteins produced by the cell
In the first part of photosynthesis, the light-dependent reaction, pigment molecules absorb electrons from sunlight.
Our liver breaks down H2O2 with the help of an enzyme that you wrote about in our liver and enzymes lab. The substrate for the enzyme in our liver experiment was:a. catalaseb. H2O2c. liverd. None of the above
How are chromosomes arranged during interphase compared toduring prophase of mitosis or meiosis?What happens to the chromosomes in the S phase of the cellcycle?
Which statement is TRUE about cellscontaining a mutation that prevents meiotic crossovers fromoccurring?A.Meiotic cohesin complexes will be removed from both arms andcentromeres immediately before Anaphase I ofmeiosis.B.There will be an increase in the frequency of chromosomallyimbalanced gametes. C.Genes far apart on the same chromosome will independentlyassort. D.Sister chromatids will separate at Meiosis I instead of MeiosisII.E.Homologous pairs of sister chromatids will properly segregate toopposite poles at Meiosis I.
To design one pair of universal PCR primers used to amplify aregion from a number of orthologs, the primers should be positionedin which region?a) splice junctionsb) highly conservedc) highly divergedd) Genomic non-coding regionsExplain the reason for your choice.
