The antiparallel b-sheet motif, first discovered by Linus Pauling, is found in which of the following protein structures? hair horns silk wool skin
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The antiparallel b-sheet motif, first discovered by Linus Pauling, is found in which of the following protein structures?
- hair
- horns
- silk
- wool
- skin
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- If an extra nucleotide is inserted in the first exon of the beta globin gene, what effect will it have on the amino acid sequence of the globin polypeptides? Will the globin most likely be fully functional, partly functional, or nonfunctional? Why?What does amino acid does the codon 5' - CAU 3' codes for? What DNA is the template for this codon? Give the sequence of the three tRNA antibodies that recognize this codon.A normal hemoglobin protein has a glutamic acid at position 6; in sickle-cell hemoglobin, this glutamic acid has been replaced by a valine. List all the possible mRNA codons that could be present for each type of hemoglobin. Can a single base change result in a change from Glu to Val in hemoglobin?
- Which of the following would be expected to be in region B? Why? Tryptophan Phenylalanine Lysine Arginine Serine IsoleucineWhich of the following would be in region C? And why? Tryptophan Phenylalanine Lysine Arginine Serine IsoleucineA sample of a peptide of unknown sequencewas treated with trypsin; another sample of the same peptide wastreated with chymotrypsin. The sequences (N-terminal to C-terminal)of the smaller peptides produced by trypsin digestion were as follows:
- Which of the following amino acids is coded for by the above tRNA molecule (in a typical eubacterial cell like E. coli)? methionine N-formylmethionine threonine phenylalanine tyrosineIdentify the various secondary structures in the β1 immunoglobulin-binding domain of protein G (GB1). Is the helix right-handed or left-handed? Is the β-sheets parallel, anti-parallel, or both ? What an elegant protein! - So beautiful.What would be the effect of a mutation that causes a poly(A)-binding protein to be nonfunctional?
- True or False: An IgM monomer can bind as many as 10 epitopes?the sequences od tRNA and corresponding mRNA is complementary to each other. is the statement true or false?Most proteins have more leucine than histidine residues, but more histidine than tryptophan residues. Correlate the number of codons for these three amino acids with this information.