Which type of bond must be broken for a beta sheet to unfold? a) Ionic bonds b)
ID: 78316 • Letter: W
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Which type of bond must be broken for a beta sheet to unfold? a) Ionic bonds b) Polar covalent bonds c) Hydrogen bonds d) Both hydrogen and polar covalent bonds It became apparent to Watson and Crick after completion of their model that the DNA molecule could carry a vast amount of hereditary information in which of the following? a) Phosphate-sugar backbone b) Sequence of bases c) Complementary pairing of bases d) Side group of nitrogenous bases If a gene promoter is located to the LEFT of the DNA sequence above, what the mRNA is sequence formed during transcription? a) 5'-ATCAGATGTCCCATTTAGTAC b) 5'-AUGUCCCAUUUAGUAC c) 5'-AUCAGAUGUCCCAUUUGUAC d) 5'-GUACUAAAUGGGACAUCUGAU You are studying gene with three exons. You analyze the transcript from a mutant gene and obtain the result shown to the right. Which of the could NOT have produced these results? a) A mutation in the intron 1 acceptor site that makes it non-functioning b) Alternative splicing c) Loss of the 3'-UTR d) A mutation in the intron 2 branch site that makes it non-operable Which of the following is characteristic feature of a carrier protein in a plasma membrance a) It exhibits a specificity for particular type of molecule b) It requires the expenditure of cellular energy to function c) It works against diffusion d) It has no hydrophobic regions When does the termination of translation take place? a) the end of the mRNA molecule is reached b) the poly-A tail is reached c) the 5' cap is reached d) A stop codon is reachedExplanation / Answer
Ans 39 . C. Hydrogen bonds
Beta sheets are formed of beta strands which are held together by the backbone of hydrogen bonds. It has an extensive network of hydrogen bonds , between N-H groups of one strand and C=O groups of the other.
Hence breaking of these bonds will unfold the beta sheet structure
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