Which of the following describes a cell structure that a gram-negative bacterium has that a gram-positive bacteria does not have? a. a membrane-enclosed nucleus in which dna is stored and protected b. a membrane-bound mitochondrion in which energy for the cell is made c. an electrically charged sugar molecule that is attracted to sodium ions d. an extra layer that is outside the peptidoglycan layer of the cell wall

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.

several tissues working together form an organ, and several organs together make up an organisms.

the group of cell that carries out special jobs are tissue.