Gram-positive and gram-negative bacteria are most commonly differentiated in the laboratory by

Which of these is not a function of some membrane proteins ? a.allowing polar molecules to enter the cell b.recognizing other types of cells c.receiving messeges from other cells b.carrying messages to oher cells

14. which of the following codons code for threonine? a. ucg b. ugu c. cga d. aca

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above