Most of the enzymes used as molecular scissors are known as restriction enzymes. what is the reason for this name? they cut (restrict) dna only at a particular recognition sequence within it. they cut (restrict) dna and remove a single nucleotide each time from the end of the dna. they cut (restrict) dna and remove a complimentary pair of nucleotides from the end of the dna. nextreset

You have just sequenced a new protein found in mice and observe that sulfur-containing cysteine residues occur at regular intervals. what is the significance of this finding? it will be important to include cysteine in the diet of the mice. cysteine residues are required for the formation of α helices and β pleated sheets. cysteine residues are involved in disulfide bridges that form tertiary structure. cysteine causes bends, or angles, to occur in the tertiary structure of proteins.