What are two main types of posttranscriptional modifications that take place in the mrna of eukaryotes? the excision of the introns and the addition of a 7-mg cap to the 3' end. the addition of a poly-t sequence at the 5' end of the gene and the addition of a poly-u tail at the 3' end. the addition of a 7-mg cap at the 5' end of the transcript and the addition of a poly-a sequence at the 3' end of the message. the addition of a poly-a sequence at the 5' end and the addition of a 7-mg cap at the 3' end of the rna transcript.

Mr. j, age 42, is a construction worker in las vegas. he recently noticed that a mole on his face seemed to be getting larger and darker. at first he did not worry because he was in the sun a lot and assumed the change may have been caused by sunburn. after a month, not only was the mole larger and darker, but it appeared to be “bumpy.” his doctor diagnosed a malignant melanoma skin cancer following biopsy of the nevus. mr. j reports pain in his right shin that does not go away when he puts his feet up or sleeps. discussion questions 1. relate mr. j’s skin changes to the warning signs for malignant melanoma. (see malignant melanoma.) 2. discuss the normal progression of this malignancy. what is the significance of the bone pain that mr. j is experiencing? (see malignant melanoma.) 3. discuss the treatment available for this patient and the prognosis for recovery. (see malignant melanoma.)

Why do you suppose the structural polysaccharide cellulose does not contain branches?

Which property is best to use when determining the strength of an ionic bond in a solid lattice energy conductivity hardness solubility