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Biology textbook answers & solutions

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Most popular questions for Biology Textbooks

The ribosome can transfer any peptidyl group from the P-site tRNA to any aminoacyl group on the A-site RNA, but the rate may vary with the identities of those groups. Propose an explanation of why the ribosome synthesizes poly-Pro sequences extremely slowly compared to other peptide sequences.

The human genome contains approximately \(10^{6}\) copies of an \(A l u\) sequence, one of the best-studied classes of short interspersed elements (SINEs), per haploid genome. Individual Alus share a 282 -nucleotide consensus sequence followed by a 3 '-adeninerich tail region. Given that there are approximately \(3 \times 10^{9}\) bp per human haploid genome, about how many base pairs are spaced between each Alu sequence?

AU-rich elements (AREs) are found frequently in the 3'UTR of mRNAs as a means of postranscriptional regulation. Why do you think AREs are found in the mRNAs that encode for proteins of the immune system?

Write an essay on diffusion caused by effects other than the concentration gradient such as thermal diffusion, pressure diffusion, forced diffusion, knodsen diffusion, and surface diffusion.

You are asked to design a heating system for a swimming pool that is $2 \mathrm{~m}\( deep, \)25 \mathrm{~m}\( long, and \)25 \mathrm{~m}$ wide. Your client desires that the heating system be large enough to raise the water temperature from \(20^{\circ} \mathrm{C}\) to \(30^{\circ} \mathrm{C}\) in $3 \mathrm{~h}\(. The heater must also be able to maintain the pool at \)30^{\circ} \mathrm{C}\( at the outdoor design conditions of \)15^{\circ} \mathrm{C}, 1 \mathrm{~atm}, 35\( percent relative humidity, \)40 \mathrm{mph}$ winds, and effective sky temperature of \(10^{\circ} \mathrm{C}\). Heat losses to the ground are expected to be small and can be disregarded. The heater considered is a natural gas furnace whose efficiency is 80 percent. What heater size (in Btu/h input) would you recommend that your client buy?
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