Aclass of chemical called a neurotransmitter is important in the transmission of nerve impulses. neurotransmitters are packaged by the cell into small, membrane-bound sacs called vesicles. upon receiving a chemical signal, the vesicles move toward the plasma membrane and fuse with it, releasing the enclosed neurotransmitters from the terminal end of the nerve cell. which organelle is most likely responsible for packing neurotransmitters into a vesicle?

The model illustrates a process by which a substance is taken up by a cell

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.